Archive of Our Own

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"This is useless," Sunoo announced after the fifth chest press, and Sunghoon could hear the strain in his voice even as Sunoo tried to sound bored about it.

Sunghoon scoffed and reached over to pull the stop on the machine, the weights dropping with a satisfying clank. Sunoo immediately slumped forward in the seat, adjusting his position and rolling his shoulders like he'd just survived a marathon instead of a basic upper body exercise.

"Useless," Sunghoon repeated flatly. "You do realize this is literally building strength, right?"

"There's no point in getting all ripped," Sunoo said, waving his hand dismissively even though Sunghoon could see the way his arms were still trembling slightly. "You can't even scratch your own back when you get that big. So forgive me if I can't see the appeal of having all those muscles if you can't reach basic parts of your own body."

"I can scratch my back just fine, actually."

"That's because you're still a chicken."

The words hung in the air for exactly half a second before Sunghoon's hand shot out to the weight adjustment lever, yanking it up several notches with a loud metallic clack that made the entire machine shudder. Sunoo let out an squeak—high-pitched and undignified—his eyes going wide.

"Say that again and I'm adding fifty pounds to your next set," Sunghoon said, his voice dangerously calm as he leaned in closer, one hand still on the lever like he might adjust it even higher. 

Then he reached over and calmly set the weight back down to where it had been, like nothing had happened.

Sunoo's laughter burst out of him, bright and delighted, showing all his teeth. The little shit had gotten exactly the reaction he wanted, and he knew it.

Sunoo always knew exactly what to say to get Sunghoon to act, to react, to do both simultaneously in whatever combination would be most entertaining. Sometimes it was batting those unfairly long eyelashes and putting on that innocent voice—"Hyungie, could you help me with this?"—and Sunghoon would be on his feet before his brain caught up with what he was doing. Other times, like now, it was deliberate teasing designed to burrow under Sunghoon's skin, followed by that smug, self-satisfied expression when Sunghoon inevitably rose to the bait. Like he wasn't the one who'd started it. Like getting Sunghoon riled up hadn't been the entire point from the beginning.

Either way, Sunghoon got to watch Sunoo be cute about it, so really its not like he could complain. How did the saying go? A win is a win when Sunoo got his entertainment and Sunghoon got front-row seats to the cutemaxxing show? Something like this, probably.

"Oh, I'm so sorry, hyung," Sunoo said, pressing his hand to his chest in mock apology. "You're just so ripped and big and strong, I'm sure you have to buy new shirts every single week because your massive muscles keep tearing through the fabric. Must be so hard for you."

Sunghoon raised one eyebrow and waited.

Sunoo kept going, really committing to the bit now. "Do you have to get them custom made? Or do you just accept that regular clothing can't contain your incredible—"

"Are you done?"

"—physique." Sunoo finished with a bright, shit-eating grin.

Sunghoon clapped his hands together once, sharp and decisive. "Great. Three more sets of ten. Go." He gestured back toward the machine, already moving to adjust the seat back into position.

Sunoo batted his hands away, actually swatted at him like Sunghoon was an annoying fly. "Jesus, no. I'm done with this shit." He swung his legs off the machine and stood up, already heading toward where he'd left his water bottle.

"You did one set."

"And I hated every second of it."

"Sunoo." Sunghoon followed him, trying to keep the exasperation out of his voice and failing. "You literally asked me to personal train you. I wasn't even supposed to be here today—it's my day off."

Which was true. Sunghoon worked at the gym as a personal trainer, sure, but Mondays were sacred. Mondays were for sleeping in and meal prep and absolutely nothing that required him to put on real pants. But then Sunoo had shown up at his apartment yesterday looking unfairly pretty in the afternoon sunlight, blinking those long eyelashes up at him with an expression of exaggerated innocence, and asked—asked, like Sunghoon had ever been capable of saying no to him when he looked like that—if Sunghoon could maybe give him some lessons. Just a few to see what all the fuss was about.

And like an idiot, Sunghoon had said yes. Had rearranged his entire Monday, come into the gym on his day off, set up a whole beginner routine tailored specifically to Sunoo's complete lack of experience with weight training.

"Well," Sunoo said cheerfully, taking a long drink from his water bottle, "I changed my mind."

Sunghoon stared at him. "You changed your mind."

"Yep."

"After one set."

"Mm-hmm."

"You're not even sweating."

Sunoo shrugged, completely unbothered. "I realized I'm already strong enough, so there's really no point in continuing. These ten minutes have been very educational, though, so thank you for your service."

"You—" Sunghoon looked Sunoo up and down, taking in his supposed "already strong enough" physique.

He was wearing a fitted white t-shirt that clung just slightly to his frame, and those criminally short athletic shorts that showed off his thighs—pale and smooth and thick in a way that made Sunghoon's mouth go dry if he thought about it too hard. Which he definitely wasn't doing right now. Sunoo's body was fine. Better than fine, actually. Perfect. Fucking yummy, if Sunghoon was being honest, which he absolutely was not going to be out loud. Lean build, surprisingly broad shoulders despite never touching a weight in his life, those grabbable thighs that Sunghoon had maybe thought about grabbing on more than one occasion when his brain betrayed him late at night—

Wait, that was not the point.

The point was: Sunoo was built well. Had that dancer-ish kind of physique that came from pilates and whatever else he did that apparently counted as exercise in his world. But he wasn't exactly the definition of "strong" in the way that word was typically understood. He was delicate. Soft. His body that looked like it belonged in a glossy magazine spread, not a gym.

"You think five chest presses made you strong."

"I was already strong before the chest presses," Sunoo corrected, leaning against the water fountain now like he didn't have a care in the world. "The chest presses just confirmed it."

"Right. Sure. You're a powerhouse, Sunoo." Sunghoon crossed his arms, and he didn't miss the way Sunoo's eyes tracked the movement—just for a second—before snapping back up to his face. "That's why you've never beaten me at arm wrestling. Not once."

"That's—" Sunoo pushed off the fountain, turning to face him fully now. "That's completely different. Arm wrestling is all about upper body strength, which is exactly my point. It's overrated."

Sunghoon stared at him. "Upper body strength is… overrated."

"Yes!" Sunoo gestured emphatically, nearly hitting someone walking past with his water bottle. "You don't need to be able to bench press a car to live your life, Sunghoon hyung. Core strength is way more important. Flexibility. Balance. You know, like, uh… things that actually matter."

"Oh, so like what you get from pilates?" The condescension in Sunghoon's voice was impossible to miss.

The change in Sunoo's expression was immediate. His eyes narrowed slightly, jaw setting in that stubborn way that meant Sunghoon had just hit a nerve.

"Exactly like what I get from pilates."

"The exercise where you lie on a mat and do tiny movements for an hour surrounded by soccer moms while new age music plays in the background?"

Sunoo's hand came up to poke Sunghoon in the chest hard right over his sternum. "Pilates is a full-body workout that focuses on controlled movements, proper breathing and building actual functional strength. Not just making your muscles look big and useless." 

"Useless again," Sunghoon caught Sunoo's wrist before he could poke him again, holding it between them. Sunoo's pulse was quick under his thumb. "You keep using that word." 

"Because it applies." Sunoo didn't pull his wrist away, just looked up at Sunghoon with that challenging expression that always made something hot curl in Sunghoon's stomach. "All that muscle and you're probably one wrong twist away from throwing your back out. Meanwhile, your core is weak as hell because all you do is isolate muscle groups instead of actually working on stability." 

"My core isn't weak—"

"Prove it."

They were standing too close now. Close enough that Sunghoon could see the way Sunoo's breathing had picked up slightly, the faint flush starting to creep up his neck that had nothing to do with the pathetic excuse for a workout he'd just done.

"Prove it," Sunoo said again, and there was something dangerous in his smile now. "Because I'm pretty sure all those chest presses and bicep curls haven't done shit for your stability. You probably can't even hold a proper plank for more than thirty seconds."

Sunghoon's grip on Sunoo's wrist tightened slightly. "I can plank for four minutes."

"Cool. Can you do it while maintaining proper pelvic alignment and engaging your transverse abdominis?"

"Can I—what?"

"Exactly my point." Sunoo pulled his wrist free finally, but he didn't step back. If anything, he leaned in slightly, and Sunghoon could smell his shampoo—something clean and faintly sweet. "You don't even know what muscles you're supposed to be using. You just pick things up and put them down and grunt a lot. 

"Oh please, you spend half the time just lying there focusing on your breathing. I've seen middle schoolers do more intense stretching routines."

Sunoo's eyes flashed. "Pilates isn't stretching—"

"It's basically yoga for people who want to feel superior about it."

"Okay, you know what?" Sunoo poked him in the chest again, and this time Sunghoon let him. "You're so confident that weight training is superior? Fine. Let me train you."

Sunghoon blinked. "What?"

"You heard me. Let me put you through a pilates workout, and we'll see how long your precious muscle mass holds up." Sunoo's eyes were bright now, that dangerous glint that meant he'd just backed Sunghoon into exactly the corner he wanted. He shifted his weight, standing just a fraction taller. "If it's so easy  then you should have no problem, right? Big strong Sunghoon with all his functional strength will do just fine." 

The emphasis on "functional" was mocking enough that Sunghoon felt his jaw clench.

"Fine," he said before his brain could catch up with his mouth. "Sure. Let's do your little mat exercises. This should be hilarious."

"Oh, it will be." Sunoo said, his voice low and pleased, something almost predatory about it that made heat spike low in Sunghoon's gut. "Trust me."

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Sunghoon was elbow-deep in the storage cabinet, pretty sure they had pilates mats somewhere in this mess, when he heard the front door chime.

He'd closed the gym twenty minutes ago after kicking out the last lingering member who always tried to squeeze in "just one more set,". The place was empty now, lights still on but eerily quiet without the usual soundtrack of grunting and metal clanking. All because he was waiting for Sunoo and his stupid idea to "prove" that pilates was somehow superior to actual strength training. 

"Sunghoooon hyuuuung?" Sunoo's voice echoed through the empty gym.

"Over here! By the mirrors!" Sunghoon called back, still rummaging through rolled-up yoga mats and resistance bands that hadn't been touched in months.

Sunoo had followed the sound of Sunghoon's voice toward the far wall, past the rows of gleaming machines, until he found him half disappeared. Just his legs visible, his entire upper body stuck inside as he rummaged around. 

"What are you—"

His fingers finally found what he was looking for—two pilates mats pushed all the way to the back. He pulled them out triumphantly just as Sunoo appeared beside him.

"Aha! I knew we had them." Sunghoon held them up—one deep blue, one bright pink. He dropped them on the floor with a soft thud and kicked the pink one toward Sunoo. "Pink's for you, pretty." He winked.

Sunoo rolled his eyes, but the corner of his mouth twitched up despite himself. "How generous." 

They both squatted down to unroll the mats, and as Sunghoon leaned forward to smooth out his, a droplet fell from his hair and landed right on Sunoo's arm. Sunoo went very still. Then looked up at him with an expression of pure betrayal.

"Are you—" Sunoo started, but before he could finish, Sunghoon deliberately shook his head like a dog, sending a spray of water droplets raining down on him. Sunoo shoved at his leg, actually managing to make Sunghoon stumble back a step."Disgusting! Get away from me, you're—"

"It's water," Sunghoon said, laughing as he stepped once more just out of Sunoo's reach. "Calm down, sugar plum, you're not gonna melt."

"You're dripping on me!"

"I'm barely damp."

Sunoo stood up, brushing dramatically at his hoodie like Sunghoon had dumped a bucket of water on him instead of a few drops. Then he paused, looking Sunghoon up and down with narrowed eyes. Sunghoon's hair was definitely wet, pushed back from his forehead with a few droplets still clinging to his temple. 

"Wait. Water?" Sunoo said. "Did you shower?"

"Yeah, after I closed up."

"But—" Sunoo gestured at him, then at the mats spread out on the floor. "We're about to work out. You're going to sweat."

Sunghoon's laugh was immediate and entirely too smug. "Oh, I doubt that very much, Sunoo. Your little mat routine gonna be so easy might as well be clean and comfortable while I prove my point." 

They moved around the mats, making sure they were laid out flat and parallel. Sunoo grabbed the hem of his hoodie and pulled it over his head in one smooth motion, tossing it aside. He was wearing a fitted tank top underneath—white, thin enough that Sunghoon could see the definition of his shoulders and collarbones. 

"You want music or something?" Sunghoon asked, pulling out his phone.

"Nah." Sunoo stepped onto his mat, already starting to roll his ankles in slow circles as he held one leg up. "I'd rather hear your sounds of struggle, actually. More entertaining."

"Bold of you to assume I'm going to struggle."

"Bold of you to assume you won't."

Sunghoon moved to stand on his own mat, then stepped over to position himself behind Sunoo instead, close enough to notice the way Sunoo's breathing changed slightly when Sunghoon got into his space.

"So," Sunghoon said, letting his voice drop lower, "how do you want me?"

Sunoo's shoulders tensed for just a second before he turned his head to look up at Sunghoon over his shoulder, eyes dark and amused.

"On your knees would be a good start."

Sunghoon felt his throat go dry. Swallowed.

Then Sunoo's expression shifted back to something more businesslike, gesturing to the mat. "We're gonna stretch first. Can't have you pulling something in the first five minutes and using that as an excuse."

"I'm not going to pull anything—"

"Yeah, yeah. Sit down. Legs out in front of you."

Sunghoon lowered himself to the mat, extending his legs straight out. Sunoo mirrored the position on his own mat, then leaned forward smoothly, folding himself in half until his chest was nearly flat against his thighs, arms stretched out past his feet. Sunghoon tried to do the same. Got maybe halfway down before his hamstrings started screaming in protest.

"Oh wow," Sunoo said, not even trying to hide his amusement as he straightened back up. "That's... that's really sad, actually."

"I can touch my toes."

"Can you, though?" Sunoo tilted his head, watching as Sunghoon strained forward another inch. "Because from here it looks like you're trying to Pinocchio your way by lying to me, but instead of growing your nose you hope it can grow your fingers so you can actually touch your toes "

"Maybe if you bent over, something else might grow just fine." Sunghoon muttered, annoyed. 

"Oh, I'm flexible enough to bend however you need, baby. Question is whether you can keep up." 

"Flexibility isn't the same as endurance—" 

"It's part of functional fitness, which you claim to be all about." Sunoo stood up in one fluid motion, walked over to Sunghoon's mat and dropped down behind him. "Here. Arms up."

Sunghoon raised his arms, and then Sunoo's hands were on his back—warm and firm between his shoulder blades—pushing him forward gently but insistently.

"Breathe out," Sunoo instructed, and when Sunghoon exhaled, Sunoo pushed him down another two inches.

Sunghoon's hamstrings fucking burned.

"Feel that?" Sunoo's voice was close to his ear, hands still pressed against his back. "That's all the tightness you've built up from only working on getting big instead of staying mobile."

"I'm mobile," Sunghoon gritted out.

"You're really not." Sunoo's hands slid down to Sunghoon's lower back, pressing there instead, and Sunghoon had to focus very hard on his breathing and not on the fact that Sunoo was basically draped across his back right now. "Okay, come up slowly."

Sunghoon straightened, and Sunoo moved back to his own mat, already transitioning into the next stretch—one leg extended, the other bent with his foot pressed against his inner thigh, folding sideways over the straight leg.

"Copy me," Sunoo said without looking over.

Sunghoon tried. Got his leg into approximately the right position, started to lean sideways. His form was shit compared to Sunoo's. Sunoo folded completely, his side practically parallel to his extended leg, arm stretched long and graceful. When he bent forward, Sunghoon caught a glimpse of pale stomach where his tank top rode up—just a sliver of skin above the waistband of his shorts.

"You're not even trying," Sunoo said, switching sides with easy flexibility.

"I am trying. This is what I look like when I try."

"Tragic."

They moved through a few more stretches—Sunoo demonstrating each one and Sunghoon following along and feeling increasingly like his body was held together with rusty bolts.

"Okay, now hip flexors," Sunoo said, moving into a low lunge.

Sunghoon copied the position, and immediately his hip flexor lit up like someone had set it on fire.

"Fuck—"

"Breathe through it," Sunoo said, far too cheerful about Sunghoon's suffering. He sank deeper into his own lunge, back knee nearly touching the ground, and Sunghoon's eyes caught on the way his thighs looked in this position—thick and soft, the fabric of his shorts pulled taut. Sunghoon looked away and focused on his own questionable form.

"You know what your problem is?" Sunoo asked, straightening up and switching legs.

"I have a feeling you're about to tell me."

"You're all tension. Everything's locked up." Sunoo moved behind him again, and Sunghoon felt hands on his hips—adjusting his position to tilt his pelvis forward slightly. "You're gonna hurt yourself if you keep training like this. There," Sunoo said, stepping back. "Feel the difference?"

Sunghoon did, actually. The stretch hit different now, but he wasn't about to admit that out loud to Sunoo of all people.

Sunghoon wiped his hands on his shorts. "Not bad for a warm-up. So what's the actual pilates part?"

Sunoo laughed bright and a little mean. "Oh, my dear hyung. That was pilates. And it was the easy part too."

Sunghoon didn't believe that for a second, but he could already feel himself getting warm that came from holding positions that looked deceptively simple but required constant activation. He grabbed the back of his shirt and pulled it over his head in one motion, tossing it aside.

Sunoo's eyes tracked the movement immediately—dropping to Sunghoon's now-exposed torso, lingering there for a beat longer than strictly necessary before flicking back up to his face. Sunghoon raised one eyebrow, smirk tugging at his lips. Caught you.

Sunoo cleared his throat, looking away. "Alright, now we're gonna work on posterior chain mobility." He moved to standing, positioning himself at the front of his mat, and his voice came out professional. "Watch first."

He bent forward at the hips, keeping his back flat and his core engaged, then pushed his hips back like he was trying to sit in an invisible chair. The movement was slow and controlled, his ass pressing back as his torso folded forward, hands reaching toward the ground.

Sunghoon just... stared. The curve of Sunoo's spine, the way his shorts rode up slightly on his thighs, the deliberate arch as he pushed his hips back further.

Sunghoon whistled low. "Okay, now I get the whole pilates thing."

Sunoo straightened up, looking over his shoulder with one eyebrow raised.

"I mean, this view alone probably does wonders for all those middle-aged women in your classes," Sunghoon continued, gesturing vaguely at Sunoo's general situation. "Great marketing strategy, really."

"Finished?"

"Actually, no—do it again."

Sunoo turned fully now, both eyebrows raised. "Excuse me?"

"I need to make sure I have the form right." Sunghoon's grin was absolutely shameless. "And your ass looked fucking incredible doing that, so, you know… for educational purposes."

Sunoo walked over and punched him in the arm hard enough to make his point.

"Ow—hey—" Sunghoon clutched his arm dramatically. "That's assault. I could sue."

"You could also shut up and do the movement yourself instead of being a perv." But Sunoo's lips were twitching, fighting a smile. He leaned in slightly, voice dropping. "Besides, if you want a better view, hyung, all you have to do is ask nicely." He tapped Sunghoon’s cheek twice. 

Sunghoon gulped. His brain was already going places it shouldn't—supplying him with extremely detailed images of what that kind of flexibility could mean in other contexts. The way Sunoo had folded himself in half during that stretch, how easily he'd pushed his hips back, the curve of his spine when he'd arched. Sunghoon's mind was taking all of that and running with it, imagining Sunoo bent in half in completely different scenarios, that same control and flexibility applied to… well.

Sunoo straightened up, clapping his hands together sharply, and that took Sunghoon out of his trance. "Okay, enough. Do the goddamn movement before I make you eat this mat. Hinge at the hips, back flat, push your ass back like you're—you know what, just do it. I'll correct your form."

Sunghoon moved into position, trying to copy what Sunoo had done. Bent forward, pushed his hips back.

"Flatter back," Sunoo said, walking around him. "You're rounding your spine. Engage your core and—yeah, there. Better."

They moved through a few more variations, Sunoo calling out adjustments and Sunghoon following along. The movements were weird—different from anything he usually did—but not impossible. His body knew how to move, how to engage muscles when directed. Years of training other people meant he could usually pick up new movements pretty quickly once he understood the mechanics.

Sunoo walked him through a few more exercises. Some kind of leg series that had Sunghoon's glutes burning in a way they never did from squats. A plank variation that required way more stability than he'd expected. Something called "the hundred" that made his abs shake after about thirty seconds. And yeah, some of it was hard. But not impossible. Not even close to what Sunghoon had been expecting based on Sunoo's confidence that he'd be struggling.

"Single leg bridge now," Sunoo demonstrated, lying on his back with one leg extended straight up, then pressing his hips off the mat using just the leg that was planted. "Ten reps each side."

Sunghoon got into position and executed the movement. It wasn't perfect, but it got the job done. Sunoo watched him complete all ten reps, then switch sides. His expression was getting progressively more annoyed.

"What?" Sunghoon asked when he finished, sitting up. "Want me to add weight or something?"

"You're not supposed to be getting these this fast," Sunoo said, and he actually sounded irritated about it.

"I move my body for a living too, Sunoo." Sunghoon stretched his arms overhead, feeling the burn in his core but nothing he couldn't handle. "Just because I think pilates is an overpriced workout doesn't mean I can't do it. Kinda my whole job to understand movement patterns and engage the right muscle groups."

Sunoo's jaw tightened slightly. "You're still not doing them right. Your form is sloppy."

"My form is fine—"

"It's really not." Sunoo moved closer, dropping to his knees beside Sunghoon's mat. "Lie back down. We're doing it again, and this time I'm actually going to make you work."

Sunghoon huffed out a breath that was half-laugh, half-exhaustion. "Yeah, okay. What were your words earlier? Oh right. I'm done with this shit."

He meant it. No point in continuing when he'd already proven his point. Sure, his form wasn't exactly perfect—he'd be the first to admit that. But it was good enough. He hadn't lied when he said it. Sunghoon was meticulous about details when it mattered—it's why he'd picked up the movements as quickly as he had, why he could translate Sunoo's instructions into somewhat passable movements. Sunoo was a good teacher too, which helped. But Sunghoon didn't have the experience, didn't have the consistency, and frankly didn't have the desire to nail it down to precision. He'd proven pilates wasn't the impossible challenge Sunoo had made it out to be. Challenge succeeded. Done.

He was already shifting his weight, planting one hand on the mat to push himself up to standing when Sunoo's hand shot out and grabbed his arm, yanking him back down. Before Sunghoon could protest, Sunoo's other hand pressed flat against his stomach, pushing him firmly back onto the mat.

"Where the hell do you think you're going?" Sunoo's voice was sharp with annoyance. "I said lie back down. We're not done."

His hand stayed there—palm pressed against Sunghoon's bare stomach, fingers splayed wide, holding him in place.

"Yes, we are," Sunghoon said, trying to sit up again. "I did your little workout. Point proven. Pilates isn't that hard."

"You did it wrong!" Sunoo pushed harder against his stomach, keeping him down.

"Oh, so now I'm doing it wrong? Two seconds ago you were mad I was doing it right!"

"You weren't doing it right, you were just—you were doing something, which isn't the same thing—"

"I literally did exactly what you showed me!" Sunghoon grabbed Sunoo's wrist, trying to move his hand.

"Are you kidding me right now? It absolutely did not look the same." Sunoo looked up at the ceiling and laughed, the sound sharp with disbelief. "Oh my god, you're impossible—"

"You're the one having a meltdown because I can actually do your precious pilates!"

Sunoo's knee came up suddenly, pressing down on Sunghoon's stomach right next to where his hand had been, putting actual weight into pinning him to the mat. Sunghoon's breath left him in a surprised huff.

"We're finishing this properly," Sunoo said, leaning forward slightly, using his position to keep Sunghoon flat. "You're acting like a stubborn meathead because you can't stand that maybe, just maybe, I'm right about this."

"Get offf, Sunoo." Sunghoon's hands came up to grab Sunoo's thigh—the one with the knee digging into his stomach—fingers wrapping around the solid muscle there and squeezing, trying to physically move him off. Sunoo didn't bulge.

"Let go of my leg."

"Get your knee out of my stomach first."

"Not until you agree to finish the set properly."

"I'm not doing another rep of your stupid—"

Sunoo pressed down harder with his knee, and Sunghoon felt the pressure increase against his abs. It was firm enough to make his point.

"Say you'll finish it."

"Fuck off—"

"Say it, hyung."

Sunghoon squeezed Sunoo's thigh harder, trying to find purchase and to move him, but Sunoo's position gave him all the leverage and Sunghoon had none from flat on his back. Fine. If pulling didn't work, he'd go a different direction as in: to twist hard, using every bit of that supposedly useless upper body strength to shove at Sunoo's shoulders and flip their positions in one quick movement. Sunoo's back hit the mat with a soft thud, his eyes going wide with surprise at the sudden reversal.

Before he could react, Sunghoon grabbed both of his wrists and pinned them above his head, using his weight to keep him down—kneeing between Sunoo's legs, dropping his weight to the middle of Sunoo's body to keep him from squirming. Sunoo immediately tried to yank his hands free by twisting his wrists, pulling against Sunghoon's grip. But it was useless. Sunghoon's hands were larger, his grip firm, and he had leverage now.

"Let fucking go," Sunoo said through gritted teeth.

"Oh, what's wrong?" Sunghoon couldn't help the laugh that escaped him. "Thought you said upper body strength was overrated."

"It is overrated, you're just—you're being an asshole about it—"

Sunghoon leaned down closer, bringing his face near Sunoo's, voice dropping an octave. "You're the asshole who kept telling me how useless my muscles are. Feeling pretty useful right now, aren't they?"

Sunoo's shirt had ridden up from the struggle—exposing a strip of pale stomach between the fabric and the waistband of his shorts. His chest was rising and falling quickly, breath coming faster, and his face was flushed—whether from exertion or frustration or something else entirely, Sunghoon couldn't tell.

"This proves nothing except you're about to get throat-punched when I get out of this!"

"I think it does, baby." Sunghoon shifted his weight slightly, settling more firmly on top of him. "Because from where I'm sitting, quite literally mind you, it kind of feels like it proves exactly what I said."

"You're literally just—" Sunoo tried to pull his wrists free again, and he failed once more. "—using brute force like a caveman. Congratulations, you discovered you're bigger than me. Do you wanna prize or something?"

"Bigger and stronger," Sunghoon corrected, grinning now. "Don't forget stronger."

Sunoo huffed an annoyed laugh. "You're so full of yourself."

But Sunoo wasn't looking at Sunghoon's face when he said it. His eyes had dropped lower—to Sunghoon's bare chest, to the way Sunghoon was leaning over him, to the position they were in with Sunghoon pinning him down.

"You done being difficult?"

Sunoo's tongue darted out to wet his lips. "Are you done being insufferable?" 

"Mmm…" Sunghoon pretended to consider. "Probably not."

"Then I guess we're at an impasse."

They were still staring at each other, and Sunghoon was suddenly very aware of every point where their bodies were touching. The warmth of Sunoo's skin under his thighs. The way Sunoo's pulse was visible at his throat, beating fast. How close their faces were.

"You could just admit I was right," Sunghoon said.

"I could," Sunoo agreed. "But I won't. Because you're not."

Then Sunoo's leg shifted—hooking one of his legs around Sunghoon's hip and using it as leverage to twist his entire body. His core engaged, and suddenly Sunghoon found himself flipped onto his back with Sunoo straddling his waist.

Sunghoon bucked his hips up, trying to unseat him, but Sunoo's thighs clamped down tighter around his sides, holding position. The movement made Sunoo shift forward slightly, dragging across Sunghoon's lower stomach in a way that sent heat straight to his groin. Sunghoon bit down hard on the inside of his cheek because Sunoo's weight—especially with how much force he was putting into keeping Sunghoon pinned—was delivering pressure directly where Sunghoon really didn't need it right now. 

Sunghoon grabbed at Sunoo's hips, trying to shove him off before his body could betray him any further, but Sunoo caught his wrists and pushed them down to the mat beside Sunghoon's head, leaning his weight forward to keep them there.

"You gonna tap out?" Sunoo's voice was teasing, completely oblivious to the crisis currently developing in Sunghoon's shorts.

"I'm good right here, actually," Sunghoon lied, already shifting his weight. 

Sunghoon twisted sharply, using his shoulder and core to roll them both. Sunoo's grip on his wrists loosened just enough for Sunghoon to yank one hand free and use it to grab Sunoo's shoulder, shoving him sideways. They rolled across the mat—a tangle of limbs and grunts and muttered curses—until Sunghoon managed to get Sunoo face-down, pressing him flat with a hand between his shoulder blades.

"Hey, Sunoo, didn't know pilates teach you how to eat mat like this." 

"Wow, so funny. You done jerking yourself off about this, or...?" Sunoo's voice was muffled against the mat but still dripping with attitude, and Sunghoon could feel the tension gathering in his body—muscles coiling like he was preparing to move. 

Sunoo's response was to brace his hands on the mat and push up hard, arching his back and using his hips to throw Sunghoon off-balance. Sunghoon's hand slipped from his back and Sunoo took advantage immediately, twisting under him and getting his knees under himself. Which meant Sunoo was on all fours now, and Sunghoon was half-draped over his back trying to maintain some kind of control, and when Sunoo shifted his weight to stabilize himself his ass pressed back directly against Sunghoon's crotch once more.

The groan that escaped Sunghoon's throat was completely involuntary, and he immediately tried to cover it by clearing his throat and shifting his hips back, putting space between them before Sunoo could notice the very obvious definitely-a-problem-now-boner. But moving away meant losing his advantage, and Sunoo took it immediately—dropping to his elbows and rolling out from under him with that same infuriating core control.

"Getting tired, baby?" Sunoo asked, pushing hair out of his face, completely unaware that Sunghoon was currently trying very hard to think about anything other than the way Sunoo's body had felt under his.

"You wish."

Before Sunoo could respond, Sunghoon lunged forward, catching him around the waist and using his momentum to flip them again. They grappled for position—Sunoo trying to twist free, Sunghoon trying to pin him without pressing their hips together because that would make the situation very, very obvious very quickly. But Sunoo was right, he was stronger than he looked, his core engaged and controlled even as they wrestled, and somehow he managed to hook his leg behind Sunghoon's knee and use it to sweep his legs out from under him.

Sunghoon's back hit the mat again, and before he could recover, Sunoo was on him in an identical position as before. Sitting right over his hips where Sunghoon was now unmistakably half-hard and praying to every god he could think of that Sunoo wouldn't notice. And Sunghoon really, really didn't want to look too closely at why that was happening right now. Didn't want to examine why Sunoo manhandling him had done it for him. But it had. Oh, it absolutely had—he had eyes. Sunoo was hot. That wasn't news. But never in his life had Sunghoon popped such an involuntary boner like this, especially not while they were supposed to be proving a point about fucking pilates of all things.

Sunoo shifted slightly, his mouth already opening to say something smug again—probably another jab about being on top or Sunghoon being underneath him—but all Sunghoon could do was stare at him with what he was pretty sure was a completely blank expression and stay very, very still. Any movement right now would create friction, therefore making this situation so much worse. 

"Sunghoon hyung, are you—" Sunoo shifted, rolling his hips slightly, and Sunghoon's hands flew to his waist immediately, trying to still him. But he couldn't stop the low groan that escaped his throat.

"No," Sunghoon said quickly, shaking his head and closing his eyes against the embarrassment flooding through him. He tried to push Sunoo off, tried to move him away before this got any worse. "Please don't say it."

Sunoo's hands came down on top of Sunghoon's, stopping his attempt to escape—fingers wrapping around his wrists and holding them against Sunoo's hips.

Then Sunoo rolled his hips again, testing. Sunghoon felt everything—the way Sunoo's ass dragged directly over his cock, the pressure and friction even through layers of fabric, the heat of it concentrated right where Sunghoon was hard and getting harder. The sensation traveled from the base of his spine all the way up, made his breath catch audibly in his chest.

"Sunoo if—if you don't stop moving right now, I swear I'm going to throw you across the gym," 

Sunoo's laugh was bright and delighted as his head tipped back. "Oh my god, you are hard." Then he looked back down at Sunghoon with eyes that had gone dark, a smirk playing at his lips as he licked it."You like it when I manhandle you? When I pin you down and make you take it? Because your cock is telling me you fucking love it." 

"Pretty sure you were the one trying to get free a second ago." Sunghoon's voice came out rough. 

Sunoo rolled his hips again, more purposeful this time, dragging himself along the length of Sunghoon's cock. "Yeah, but I'm not the one bricked up right now, so I won."

It was infuriating how gleeful Sunoo looked, confident and smug about this whole situation when he was the one who couldn't stop grinding down. All that attitude and satisfaction written across his face while his hips kept moving, making it impossible for Sunghoon to think straight.

He wanted to wipe that smile off Sunoo's face. And because his brain had officially relocated all thinking capabilities directly to his now fully hard cock, he decided he was going to do it with his mouth. Sunoo was moving so fucking good on top of him that werent any alternatives aside from doing just that.

Sunghoon sat up fast with one hand bracing on the mat behind him as the other grabbed the back of Sunoo's neck to pull him in to close the distance between them before Sunoo could react. Their mouths crashed together—Sunghoon's teeth catching Sunoo's upper lip immediately, noses bumping as they tried to find the right angle. Sunghoon bit down on Sunoo's bottom lip hard enough to make him gasp. The moment Sunoo's mouth opened, Sunghoon licked into it, their tongues meeting with too many years of unacknowledged tension finally breaking open between them.

Sunoo made a sound—half whimper, half moan—and his hips stuttered but didn't stop. If anything, they moved faster, grinding down harder now that they were pressed chest to chest, now that Sunghoon could wrap his arm around Sunoo's waist and pull him in even closer.

Sunghoon groaned into Sunoo's mouth when Sunoo's teeth caught his lip in retaliation, biting and then soothing it with his tongue. The kiss broke for half a second—just long enough for them both to gasp for air—before Sunghoon was pulling him back in, kissing him like he was trying to devour him whole. Sunoo's hands were in his hair now, tugging hard enough to make Sunghoon's scalp sting, and the small spike of pain just made him kiss Sunoo harder, made him bite at his lips and lick into his mouth while Sunoo kept rolling his hips in that maddening rhythm that was going to make Sunghoon lose his fucking mind.

Sunoo pulled back from the kiss, breathing hard, eyes dark and pupils blown wide. "Are—are we really going to do this?"

Sunghoon's answer was to drag his mouth down to Sunoo's neck instead, biting at the tendon there before soothing it with his tongue. Sunoo's head tilted to the side immediately, giving him more access, and that was all the answer Sunghoon needed.

He could think about the implications later—about what this meant for their friendship, about whether this was a terrible idea, and all the very reasonable concerns his brain would probably supply once blood returned to it. But right now, Sunoo was hot and pliant on top of him, making these breathy little sounds that were making Sunghoon's cock leak in his pants, and he couldn't be bothered with reason. All Sunghoon wanted to do right now was to bend him in half and put all that flexibility to the test, see if he could make Sunoo's spine arch the way it had during those stretches. Wanted to drive deep into him and find out if he stayed that controlled and precise when Sunghoon was inside him, or if he'd fall apart completely.

Sunghoon flipped them in one quick movement—pressing Sunoo down onto the mat but keeping their bodies flush together, no space between them as he settled between Sunoo's legs. His hips rolled down, grinding his cock against Sunoo with deliberate pressure, and Sunoo's leg came up to hook around his waist, pulling him in closer.

Sunghoon's mouth found Sunoo's ear, lips brushing against the shell of it as he spoke, voice rough and low. "I'm gonna fuck you right here on this mat until the only workout you can think about is my cock inside you." 

Sunoo shivered underneath him, a full-body tremor that Sunghoon felt everywhere they were touching. Sunghoon straightened up, pulling back from where he'd been pressed between Sunoo's legs.

Sunoo's legs immediately tightened around his waist, trying to keep him there. "Where do you think you're going?"

It almost worked—the strength in Sunoo's thighs was no joke, and Sunghoon felt the pull—but he'd gotten pretty good at recognizing Sunoo's patterns over the past few minutes of rolling around on the mat together to have any real effect.

He gripped Sunoo's thighs and unwound them from his waist, holding his sitting position, and looked down at Sunoo sprawled beneath him. "Take your clothes off."

Sunoo rolled his eyes. "Do it yourself."

"I could," Sunghoon said, letting his gaze drag deliberately down Sunoo's body. "But I think you'll put on a better show if you do it."

Sunoo's eyes went dark at that, and a slow smile curved across his lips. "Oh, you want a show, baby? I'm going to make it good for you, then."

He let go of Sunghoon's leg and pushed himself up to sit, positioning himself directly in front of Sunghoon. His eyes locked on Sunghoon's face, holding his gaze with an intensity that made Sunghoon's breath catch. Sunoo licked his lips slowly and his smile widened just slightly.

Then his hands went to the hem of his tank top. He pulled it up slowly—so fucking slowly—bunching the fabric in his fists as he revealed inch by inch of pale skin. Sunghoon's eyes dropped immediately, following the movement, watching the way Sunoo's stomach flexed as he raised his arms, the way the light caught on the smooth planes of his chest and ribs.

Sunoo pulled the shirt over his head and tossed it aside, his gaze fixed somewhere to the side like he wasn't even paying attention to Sunghoon's reaction. Then he lay back down on the mat in one fluid movement, arms stretched above his head for a moment before his hands came down to rest at his waistband.

His thumbs hooked into the elastic of his shorts. He started pulling them down with that same unhurried pace—revealing the sharp cut of his hip bones first, then lower, the fabric stretching as he dragged it down until the base of his cock was just barely visible. The skin there was so smooth, and Sunghoon felt his own dick twitch hard in his shorts—visible enough that he knew Sunoo saw it, saw the way Sunoo's eyes flicked down to look and his smile turned more satisfied.

Then Sunoo stopped and let the elastic snap back into place, covering everything he'd just revealed. 

"Sunoo, I swear to god—" 

Sunoo tilted his head to the side and smiled at him. His hand traveled down his stomach, fingers trailing over skin as he hooked his thumbs back into his waistband. Started pulling down again with that same deliberate slowness. This time he didn't stop.

It was torturous how Sunoo was taking his time with it, enjoying the fact that he was only riling Sunghoon further with it. Sunghoon should've just ripped the fucking clothes off him the second he had the chance—would've been faster, more efficient, and he wouldn't be sitting here watching Sunoo drag this out like he had all the time in the world while Sunghoon's dick was trying to bore a hole through his shorts.

Sunoo lifted his hips off the mat, arching slightly to work the fabric down, and inch by inch more of his cock came into view. Half-hard already, flushed and starting to fill out, the fabric catching slightly on the head before Sunoo gave one final tug and freed himself completely. His cock lay against his stomach, the head dark and slick at the tip and Sunghoon's mouth actually watered looking at it.

Sunoo finished pulling the shorts off by the ankles, then held them up by one finger—letting the fabric dangle there for a moment while he looked at Sunghoon with that same infuriating saccharine smirk—before letting them drop to the floor beside the mat. 

The fabric didn't make any sound as it hit the ground, but if it did, it would've been the same click that went through Sunghoon's head like a final switch flipping that said I need him right fucking now. Because in the same moment, he was on Sunoo again, crashing their mouths together with zero finesse, just desperate and messy and consuming. His hands roamed over Sunoo's body—tracing the lines of his ribs, feeling the way his stomach tensed under his touch, mapping out skin he'd been staring at without being allowed to touch like this.

Sunoo's hands came up to cup the back of Sunghoon's neck, fingers threading through his hair and holding him close, keeping their mouths locked together even when they both needed to breathe. Sunghoon's hand traveled lower, fingers grazing over Sunoo's nipple on its way before continuing down, down, until his hand wrapped around Sunoo's cock.

He stroked once, base to tip, feeling the weight and heat of it in his palm, feeling the way Sunoo was getting harder with every second.

Then he let his thumb work over the head, collecting the precum beading at the slit and dragging it down along the underside, right where Sunoo was most sensitive. Sunoo's fingers tightened in his hair immediately—pulled hard enough to sting—and he moaned directly into Sunghoon's mouth, the sound vibrating between them and making Sunghoon gasp against his lips.

Sunghoon kissed the corner of Sunoo's mouth one last time before pulling his hand away from Sunoo's cock. He brought both hands up to cup Sunoo's face instead, tilting his head to the side to expose the line of his neck as he wetted Sunoo's cheek with his own precum. Sunghoon leaned in, teeth catching Sunoo's earlobe and tugging gently before his lips brushed against the shell of his ear.

"On all fours, baby."

Sunoo's breath hitched and his hands came up to shove at Sunghoon's shoulders, pushing him back to make space. Then Sunoo rolled over onto his stomach in one fluid movement. Sunghoon's brain short-circuited watching him move.

First Sunoo got into his hands and knees slowly, rising up into position with his back arched just slightly, hips lifted. He glanced back over his shoulder at Sunghoon, eyes dark and lips parted, holding his gaze for a long moment before letting his elbows bend. His upper body lowered inch by inch—arms sliding forward on the mat, chest getting closer to the ground, that arch in his spine deepening with every second. His head tilted to the side, cheek pressing against the mat, and the position made his ass lift higher, making the curve of his back more pronounced.

Sunghoon's hand moved to his cock without thinking, palming himself hard through his shorts at the sight of Sunoo completely on display. 

"Like this?" Sunoo's voice came out low and a little breathless.

Sunghoon's eyes traveled down the length of Sunoo's body—over the slope of his back, the dip of his spine, the spread of his thighs—before fixing on his hole. Pink and tight and clenching slightly, and Sunghoon felt something possessive and hungry claw its way up his throat.

The vision was sinful and definitely imprinted itself onto Sunghoon's brain forever. Sunoo bent and willing and waiting for him—the reality of it was so much better than anything Sunghoon's brain had conjured up, against his better judgment, before. Made him feel greedy and desperate, made his cock throb with how badly he needed him, his entire body screaming to be inside Sunoo. 

He palmed himself harder, the friction barely enough through the fabric, and then dropped any pretense of restraint—if there'd even been any left considering he was about to fuck his friend on a pilates mat in his own gym. Sunghoon shoved his shorts down just enough to free his cock, wrapping his hand around himself properly and stroking it, his eyes never leaving the sight of Sunoo laid out in front of him.

Sunghoon's free hand moved to Sunoo's ass, fingers spreading him open to get a better view. The stretch made everything more visible, made Sunoo's hole clench and relax under his gaze, and Sunghoon's mouth actually watered. Still holding him open, Sunghoon let his thumb sweep lightly over the puckered skin, barely any pressure at all.

"Fuck—" Sunoo shivered, his whole body reacting to the touch."Stop teasing."

"Oh, so when you take your sweet time doing a striptease, that's fine, but I can't?"

"You're such a—" Sunoo started, but whatever witty comeback he'd been building got cut off the second Sunghoon added pressure with his thumb, pushing in just enough for the tip to breach him.

Sunghoon pulled his thumb back immediately then swept it over Sunoo's hole again, this time with more pressure. Sunoo's breath stuttered, his back arching deeper, and his thighs trembled slightly with the effort of holding himself up and open. Sunghoon let go of his own cock—would deal with that later—and used both hands to spread Sunoo wider, leaning in close enough that he could feel the heat radiating off Sunoo's skin.

He licked his lips, gathered saliva, and spit directly onto Sunoo's hole. Sunoo made a choked sound, his hips jerking slightly at the sensation. He then brought his index finger down, spreading the wetness around before pressing in slowly. Even with the spit, there was resistance—dry and tight—and Sunghoon took his time, working his finger in carefully because he didn't want to hurt him, no matter how much worked up he was already. 

Once his finger was fully inside, he pulled back and spit again, watching the way it dripped down and made everything slicker.He started fucking Sunoo with his finger—slow, deliberate thrusts—and leaned in even closer, his breath ghosting over heated skin. "You're so fucking tight, Sunoo—fuck. Gonna feel so good around my cock."

He was close enough now that it felt natural and human, to be frank, to dart his tongue out and lick around where his finger was working Sunoo open, tasting salt and skin and the hint of his own spit. Sunoo clenched hard around him—so tight Sunghoon was genuinely surprised his finger didn't snap in half—and a whimper escaped Sunoo's throat.

Sunghoon pulled his finger out and replaced his tongue there instead, licking over Sunoo's hole with broad strokes before sealing his lips around it and sucking. Sunoo's entire body shuddered, a moan muffled with the way he was bitting his own lip, and Sunghoon felt him start to relax incrementally—the tight ring of muscle loosening just slightly under the attention.

He worked his tongue inside, fucking into Sunoo wet and messy, and when he pulled back to slide his finger in again, there was less resistance. He worked it in and out a few times, crooking it slightly, before adding a second finger alongside the first. The stretch made Sunoo gasp, his fingers scrambling for purchase on the mat, but he didn't pull away. Just took it, his body adjusting as Sunghoon scissored his fingers apart, working him open properly now.

With the combination of spit and Sunoo's body starting to give, the glide got easier, Sunghoon's fingers moving more smoothly now, the wet sounds of it obscene in the quiet gym.

Sunghoon pulled his fingers out slowly, watching the way Sunoo's hole clenched around nothing, still slick and open from the stretch. Then he leaned down and bit Sunoo's ass hard enough to make Sunoo yelp and jerk forward.

"What the fuck—" Sunoo looked back over his shoulder, hair falling into his eyes, cheeks flushed and lips swollen from kissing. "Did you just bite my ass?" 

"Couldn't help it," Sunghoon said, grinning even though Sunoo couldn't see him. "You've been putting this on display all night. I had to."

"That's not how that works—"

"Sure it is."

Sunoo pushed himself up from the mat, turning around to face Sunghoon properly.

"Turn over," Sunghoon said. "Wanna see your face when I fuck you."

"Romantic," Sunoo said dryly, but he was already moving, lying back on the mat and spreading his legs without being asked. Sunghoon caught a glimpse of his cock—fully hard now, flushed dark and leaking against his stomach.

Sunghoon shifted forward, settling between Sunoo's thighs, and reached down to line himself up. His hand wrapped around his cock, positioning himself at Sunoo's entrance, before his brain caught up and his hand froze mid-motion. 

"What?" Sunoo asked, propping himself up on his elbows to look at him.

"We don't have lube."

Sunoo blinked. "You're joking."

"Does it look like I'm joking?" Sunghoon gestured vaguely around the gym. "Sorry but I didn't exactly plan on fucking you when I agreed to this workout, so I didn't think to stash any in the equipment room."

"Oh my god."

"So…" Sunghoon's mouth curved into a cocky smirk. "Gonna need you to get me nice and wet, baby."

Sunoo stared at him for a long moment, then laughed sharply and disbelievingly. "You want me to suck you off because you didn't bring lube to the gym? Should've thought about that before getting hard."

"Well, when you say it like that it sounds bad."

"You literally just asked me to spit-shine your dick, hyung."

"Okay, see, now you're making it worse."

Sunoo laughed despite himself, already sitting up and reaching for Sunghoon's hips to pull him closer. Sunghoon's smirk widened. 

"Good boy. I knew you would."

"Shut up before I bite it off."

"Please don't. I'm gonna need that in about two minutes."

Sunoo rolled his eyes but wrapped his hand around the base of Sunghoon's cock anyway, and Sunghoon's breath caught as Sunoo's tongue darted out to lick over the head.

Sunghoon let Sunoo take the lead—the way he always did when Sunoo was in this kind of mood despite his best efforts to always make it difficult for him just for the sake of being annoying. Sunoo's hand wrapped around the base of his cock first, just holding him steady while his tongue darted out to lick over the head.

Fuck.

The first touch of wet heat made Sunghoon's thighs tense, made his breath stutter in his chest. Sunoo's tongue swirled around the tip, catching on the slit and lapping up the precum that had been gathering there, and Sunghoon couldn't stop the groan that escaped his throat. Sunoo pulled back just enough to look up at him through those stupidly pretty hazel-brown eyes, and there was something smug in his expression even with Sunghoon's cock an inch from his lips. Then he leaned back in and dragged his tongue along the underside, following the prominent vein there from base to tip slowly.

"Jesus—fuck—" Sunghoon's hand came up automatically, brushing Sunoo's bangs out of his face so he could see better, then threading into his hair to hold him there, needing something to anchor himself to.

Sunoo's mouth sealed around the head properly this time, sucking with enough pressure to make Sunghoon's hips twitch forward involuntarily, and Sunghoon had to actively fight the urge to just thrust into that wet heat and fuck Sunoo's throat.

"Your mouth is fucking perfect," Sunghoon managed, voice rough and strained.

Sunoo's eyes flicked up to meet his again, and Sunghoon watched him take more—watched his lips stretch around Sunghoon's cock as he sank down inch by inch, taking him deeper. His eyes were so expressive like this, pupils blown wide and hazy with arousal and framed by those long lashes.

Sunghoon could feel the way Sunoo flattened his tongue against the underside and pressed up right wherehe was most sensitive while simultaneously hollowing his cheeks. Sunghoon's hips jerked forward on instinct. His cock pushed deeper into Sunoo's mouth, half-seated in that delicious heat, and Sunoo's eyes fluttered closed, his expression going utterly wrecked for a second like he was the one getting fucked instead of the one giving head.

That shouldn't have been as hot as it was; Sunghoon felt the way Sunoo looked completely gone just from having Sunghoon's dick in his mouth straight in his gut. Sunoo pulled back to breathe, a string of saliva connecting his lips to Sunghoon's cock. Then Sunoo was taking him again, deeper this time, working his jaw open and relaxing his throat to take more of Sunghoon's length. Sunghoon's fingers tightened in his hair without meaning to.

Sunghoon's head tipped back, eyes closing for a second before forcing them open immediately after because he needed to see this. The pathways between trying to form words in his brain to actually outing them weren't making sense anymore, but Sunoo seemed to get the sentiment because Sunghoon felt him hum around his cock, the low vibration traveled straight up Sunghoon's spine and made his toes curl.

Sunoo was drooling now, spit and precum making everything slick and messy, and he was taking Sunghoon deeper with every bob of his head, finding a rhythm that had Sunghoon mentally cursing himself to why they never did that before.

Sunghoon's hand tightened in Sunoo's hair—pulling just the right amount to communicate to Sunoo he was getting close—as he had to physically force himself to tug Sunoo back before he came down his throat.

"Stop—fuck, stop, I'm gonna—"

Sunoo pulled off slowly, letting Sunghoon's cock slide out of his mouth, and before Sunghoon could process what was happening, Sunoo leaned in and pressed a soft kiss directly to the tip.

Sunghoon laughed breathless and maybe a little delirious. Sunoo wiped his mouth with the back of his hand and lay back on the mat, stretching out like he had all the time in the world. Sunghoon's eyes tracked down the length of his body before he reached out to grab Sunoo's ankles.

He spread Sunoo's legs apart, pushing them up and out, and Sunoo went easily.

"You know," Sunoo said conversationally, like they weren't about to fuck on a gym mat, "this would be a great time for you to admit pilates makes you more flexible."

"I'm not admitting to anything." Sunghoon answered, mumbling the words. 

"You should, though. I can see on your face that you're into it."

Sunghoon shifted forward, still holding Sunoo's ankles, and reached down to line himself up properly. "You gonna keep talking or are you gonna let me fuck you?"

"I can do both."

"Of course you can."

Sunghoon pressed forward, the head of his cock breaching Sunoo's entrance, and he had to bite down hard on his lip—hard enough he tasted copper—because even with all the spit and the prep, Sunoo was still so fucking tight. He kept one hand wrapped around the base of his cock, guiding himself in slowly, and his eyes couldn't decide where to look. His vision kept switching between watching his cock disappear inch by inch into that tight heat and looking up at Sunoo's face to gauge his reaction.

Sunoo's eyes were squeezed shut, his jaw clenched, and Sunghoon paused immediately.

"Good?"

"Yeah," Sunoo managed, voice strained. "Just—stings a little. Keep going."

Sunghoon let go of one of Sunoo's ankles he was still holding, letting the leg drop to hook around his waist, and brought his hand to Sunoo's cock instead. He wrapped his fingers around it and started stroking slowly, trying to give Sunoo something else to focus on, something that felt good instead of just the stretch.

Sunoo's breath hitched, and some of the tension in his shoulders eased.

Sunghoon pushed in a little more in torturously slow pace, giving Sunoo time to adjust with every inch. It felt like it took forever, his entire body screaming at him to just thrust in and take what he wanted, but he held back until finally—finally—he was fully seated inside Sunoo. The feeling of it made Sunghoon's arms shake, made him drop his weight forward onto his forearms so he didn't collapse completely. He was buried as deep as he could go, and Sunoo was hot and tight and perfect around him.

"Hyung," Sunoo said softly, and when Sunghoon looked down, Sunoo's eyes were open now—dark and hazy and so fucking pretty. "Kiss me."

Sunghoon kissed him, one hand coming up to massage Sunoo's hip, soothing the muscle there in an attempt to try to help him relax. Sunoo's legs tugged at his waist pulling him in closer. The movement made Sunghoon shift slightly inside him. At the exact same moment, Sunoo clenched around him and Sunghoon had to break the kiss immediately to moan because he was pretty sure he was about to come right there.

"Oh fuck—warn a guy before you do that." 

"I'm ready," Sunoo said, and tugged at Sunghoon's waist again with his legs.

This time the movement made them both moan—Sunghoon from the way it shifted him deeper, Sunoo from the angle it created, the way Sunghoon's cock dragged against something inside him that made his back arch off the mat.

Sunghoon pulled back agonizingly slow until just the tip of his cock was still inside Sunoo, feeling the way Sunoo's body tried to clench around him and keep him there. Then he drove back in just as slowly, watching the way Sunoo's lips parted on a gasp, the way his fingers scrambled for purchase on the mat.

He looked good like this. Spread open and taking it, his skin flushed pink from his chest up to his cheeks, his cock hard and leaking against his stomach. Sunghoon did it again—pulled out to the tip, then pushed back in with the same slow pace. He could feel every inch of Sunoo around him, could feel the drag and pull of tight heat, and it was taking everything in him not to just start pounding into him.

"Hyung—" Sunoo's voice came out breathy and wrecked. "You can—you don't have to go so slow."

"Yeah?"

"Yeah."

Sunghoon pulled out again, but this time when he thrust back in, he put force behind it, hard enough that Sunoo's whole body shifted up the mat. Sunoo's moan broke off into something higher and more desperate. There it was. Sunghoon did it again—same motion, more force—and Sunoo's legs tightened around his waist, his back arching up off the mat as Sunghoon hit something inside him that made his entire body react.

"Fuck—there, right there—"

Sunghoon angled his hips slightly, making sure to hit that spot again with the next thrust, and Sunoo's hand flew up to grab at Sunghoon's shoulder, nails digging in hard enough to leave marks. The pace started picking up naturally after that—Sunghoon couldn't have kept it slow if he'd wanted to. His hips snapped forward faster, pulling out and driving back in with increasing speed, and Sunoo was taking all of it, meeting every thrust with the roll of his own hips.

Sunoo's mouth was open, gasping and moaning with every thrust, and the sounds he was making were obscene—high and needy and completely unfiltered. His eyes were half-lidded, barely focused, and there was drool gathering at the corner of his mouth that he didn't even seem to notice.

Sunghoon was completely gone for it as he dived to lick at the corner of Sunoo's mouth. For the way Sunoo looked absolutely wrecked beneath him, the way his body was responding to every movement, the way he was so vocal about what felt good.

"So—fuck—so fucking tight," Sunghoon managed, his voice rough and strained.

Sunoo whimpered at that, his head turning to the side like he couldn't handle the praise Sunghoon leaned down again to bite at his exposed neck, making Sunoo cry out and clench around him. Sunghoon's hips were slamming into Sunoo with enough force that the sound of skin on skin echoed through the empty gym, mixing with their combined moans and the wet sounds of Sunghoon fucking into him.

Sunoo's cock was trapped between their bodies, getting friction with every thrust, and Sunghoon could feel it leaking precum against his stomach, making everything even more slick and messy.

Sunghoon pulled back just enough to create space. "Touch yourself,"

Sunoo's hand immediately went to his cock, wrapping around it and stroking in time with Sunghoon's thrusts. The visual of it—Sunoo jerking himself off while Sunghoon fucked him—was almost enough to make Sunghoon come on the spot.

"Fuck, you're so hot," Sunghoon said, not even sure if he was making sense anymore. "So fucking hot like this. You have no idea."

Sunoo's other hand was still clinging to Sunghoon's shoulder, and his eyes had drifted shut again, his face completely lost in pleasure. His mouth was open, gasping and moaning, causing his chest to heave with every breath. Sunghoon straightened up suddenly, shifting his weight back, and Sunoo's eyes fluttered open in confusion.

"What—"

"Need to test something," Sunghoon said, grabbing behind Sunoo's knees. "Consider this a field study."

"A what—oh fuck—"

Sunghoon pushed Sunoo's legs up and back, folding him nearly in half, and holy shit—Sunoo's flexibility was actually insane. His knees were almost at his shoulders, his body bending in ways that shouldn't be physically possible. Sunghoon kept pushing, kept testing how far he could go.

"Holy fuck, how far can you—"

"Further," Sunoo gasped out, and there was something smug in his voice even though he could barely speak. "Told you—pilat—fuck, hyung."

Sunghoon pushed his legs back more, and Sunoo took it, his body accommodating the stretch like it was nothing. The new angle made Sunghoon's cock hit even deeper, every thrust with nowhere to go but deep inside him. Sunghoon's hips slamming forward with enough force to make Sunoo's whole body shake. Sunoo was moaning with every thrust, his hand flying over his cock, his face wrecked and beautiful and so far gone.

"Hyung—I'm gonna—"

"Do it. Come for me, Sunoo."

It was the angle that did it—Sunghoon hitting that spot inside him at the same time Sunoo's hand twisted over the head of his cock—and Sunoo came with a broken cry, his whole body going taut as he spilled over his stomach in thick white streaks. And the sight of it—Sunoo's face when he came, the way his eyes rolled back and his mouth dropped open, the way his body clenched so tight around Sunghoon's cock—was the most beautiful thing Sunghoon had ever seen.

It pushed Sunghoon right over the edge.

He let go off Sunoo's leg and pulled out fast, his hand immediately wrapping around his cock to jerk himself through it as he came. He threw his head back feeling his vision going white, painting Sunoo's stomach adding to the mess already there. Sunghoon squeezed out the last drops, breathing hard, and when he finally looked down, Sunoo was completely wrecked beneath him with cum pooling in the dip of his stomach, his body still twitching with aftershocks, his chest heaving as he tried to catch his breath.

"Fuck," Sunghoon breathed.

They stayed like that for a moment—both trying to catch their breath, hearts pounding, the gym silent except for their heavy breathing.

Sunghoon's eyes were still fixed on Sunoo's stomach, on the mess. Something occurred to Seunghoon seeing it. He'd put that there. They'd made that mess together. Suddenly Sunghoon wanted to taste it.

Before he could talk himself out of it, he leaned down and dragged his tongue across Sunoo's stomach licking up the cum pooled there. It was salty and bitter and obscene, but that didn't stopped Sunghoon— he kept licking and sucking at Sunoo's skin until most of the mess was gone.

Then he moved lower, mouth closing around Sunoo's cock and sucking.

"Fuck—wait—hyung—" Sunoo's whole body jerked, his hands flying to Sunghoon's hair and tugging hard. "Too much—I can't—"

Sunoo's scream was high and desperate, his thighs trembling on either side of Sunghoon's head, and Sunghoon pulled off with a satisfied hum, licking his lips as he looked up at Sunoo's wrecked face. 

"You're evil," Sunoo squinted at him.

Sunghoon laughed and dropped onto his back beside Sunoo on the mat, throwing one arm over his eyes as he tried to get his own breathing under control.

❚█══█❚

Sunghoon was pulling his shorts back up when he asked, "Remind me why we never did that before?"

His legs felt like jelly, and there was a pleasant ache settling into his muscles that had nothing to do with the workout they'd started with. He could still feel the ghost of Sunoo around him, could still taste him on his tongue.

Sunoo yanked his tank top over his head, hair sticking up in about fifteen different directions. "Because we're both idiots, obviously."

Sunghoon laughed, reaching for his own shirt and pulling it on. Sunoo looked completely wrecked—his lips were swollen and he was moving a little stiffly as he searched for his other shoe. Sunghoon had done that. The possessive satisfaction that curled in his chest probably wasn't healthy, but he didn't really care.

"Let's go another round in the shower," Sunghoon suggested, watching Sunoo finally locate his shoe under the weight bench.

"What do you think I am, a machine?" Sunoo shoved his foot into the shoe, then paused, straightening up with a thoughtful expression. "Actually, we could go to my place. I have actual lube there like a normal person."

"Thank god for pilates," Sunghoon said, grinning as he finger-combed his hair back into something resembling order. His brain was already running through possibilities where they could really take their time. "Now all I can think about is every single position I can bend you into."

Sunoo slapped his arm, hard enough to sting. "Okay, you know what? Weight training has its uses too. You carried me pretty well."

Then his eyes drifted over to the pilates mats they'd just fucked on—now thoroughly wrinkled and definitely sporting some… questionable stains—and his nose wrinkled in disgust.

"You're gonna have to throw those out, by the way. No amount of disinfectant is saving them now."

Sunghoon looked at the mats, then back at Sunoo, and couldn't stop the laugh that escaped. Worth it. Completely worth it. Sunghoon crossed the space between them and grabbed Sunoo by the waist, pulling him in fast. Sunoo stumbled forward with a surprised noise, but Sunghoon caught him easily, pressing their bodies together and looking down at him. His eyes traced over Sunoo's face.

Sunghoon's gaze dropped to those lips, then back up to meet Sunoo's eyes.

"Now that I’m thinking about it," Sunghoon murmured. "Cardio might actually be my favorite form of exercise now."

He kissed Sunoo before he could respond—slow and deep, taking his time with it now that they weren't in a desperate rush. Sunoo melted into it immediately, his hands coming up to rest on Sunghoon's chest.

When they finally broke apart, Sunoo was slightly breathless. "For the first time in my life, I'm agreeing with you."

He pulled away and started walking toward the door, then looked back over his shoulder with a smirk. "But if you don't hurry up, I'm changing my mind about letting you come over."

Sunghoon was moving before Sunoo finished the sentence.

They left the gym together—the pilates mats forgotten behind them, the argument about superior workout methods officially settled in the best possible way. Sunghoon couldn't stop grinning as he locked up.

He was never going to hear the end of this from Sunoo. And honestly? He was completely fine with that.