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Cursed, no finger for Yuuji to eat, and a tattoo on Megumi’s stomach.
“Fuck.”
Megumi spends the better part of the day climbing up an old abandoned castle whose stairs literally sag, trying to suck him and Yuuji down every other step. Around each corner is a cursed spirit, though that isn’t surprising--they knew ahead of time that this castle held history, as it used to be a military base, and the leftovers of war are prime feeding for curses. Most of which are easy to dispel. Until they find the one that isn’t.
Megumi is the first one to step over the threshold to the castle’s highest tower. A small blob of flesh with a helmet flees the room, squeaking, but not before it spreads a sweet scent in the air, Megumi breathing it in before he knows what’s happening. He turns to run after the curse, or he tries to, but he only succeeds in taking one slow step as if he’s wading through molasses. Fuck. He tears at the buttons of his uniform, suddenly stifled by his clothing.
Yuuji was about to head after the curse himself, but he stops. “Megumi, what are you doing?”
“It’s hot,” Megumi says. He lifts his hands to his face, feeling it like a foreign object.
“I feel a little warm, but not that hot. Oh shit, are you burning to death?”
Harsh laughter fills the air. Yuuji slaps his own cheek, but Sukuna talks around Yuuji’s hand. “Fools,” he says.
Megumi says, “Leave me. Get rid of the curse, Yuuji.”
“I’m not leaving,” Yuuji says stubbornly. “I don’t know what the hell that curse did to you, but shouldn’t we get you help first?”
“I know how to help,” Sukuna announces in his deep voice. Megumi can’t stop staring at Sukuna’s mouth. He hates it, but he believes him a little.
“Shut up!” Yuuji says. “You’re no help at all. You’re the one that said there might be a finger here.”
“Take your top off, Megumi.” Sukuna’s voice makes Megumi’s stomach swoop, and that’s not a normal reaction to have.
“Ugh, don’t listen to him--”
Megumi lifts his shirt. Below his belly button there’s a flowering black mark. He pulls his waistband lower to see the full design. It’s symmetrical, with an intricately patterned center, vines flowing out from the middle. He feels like he’s going to faint.
Yuuji makes a note of surprise and steps closer to Megumi. “When did you get a tattoo?”
Megumi glares at him, or maybe he can’t take his eyes off him. “Idiot.” Megumi clasps his hands to his stomach. The touch feels… good. But not enough. Embarrassingly, his slacks start feeling tight. Yeah. This is the curse’s doing.
“The curse has a time limit,” Sukuna says. “You don’t have long.”
Yuuji says, “Just tell us what it wants!”
Sukuna’s grin couldn’t be wider, eating up half of Yuuji’s forearm. “That was a military curse, and this was his room. He said he died a virgin. He’s saving you from being like him.”
Megumi and Yuuji both freeze. Now their reactions make sense. Megumi can’t pretend that he doesn’t notice Yuuji’s… body, more than usual, and he’s abnormally drawn to him. Before either of them realize it, Yuuji’s hands are on Megumi’s stomach too. Which lessens the painful heat brewing inside him.
“Hell no,” Yuuji says, “You’re my bro, Megumi, I can’t do this with you.” He looks down at the bulge in his own pants like it’s betrayed him.
“Let me do it,” says Sukuna’s sibilant voice.
Yuuji looks more grossed out than when he swallowed the first finger. “No way,” he says. “Ok, ok, I can do this. We can do this.” He closes his eyes, scrunching his face up so it looks distorted, and puckers his lips.
Megumi swallows. He looks at Yuuji’s unwilling face and thinks about it for a minute, carefully weighing the pros and cons. Then he makes his decision. “Sukuna. Switch with him.”
“Megumi!” Yuuji says, his eyes flying open. “What--”
He doesn’t say another word before his eyes close again, and black tattoos spread across his face.
There is a mat on the floor. Megumi lies on it with his legs spread, heat overwhelming him. His senses are on fire. He notices Sukuna - too much - his naked body, his presence, the look in his eyes as he stares at Megumi like he wants to eat him. And maybe he does.
“I want you to know I’m only doing this because I have to.”
“And I want you to know, I’m doing this because I want to.”
Megumi sneered at him. But he found it a little intoxicating to hear that someone with that much power. Though perhaps it was the heat. What did Sukuna want with him, anyway?
“Lift your legs.” Sukuna says, remarking creepily, “So creamy.” He slides his hands from Megumi’s calves up to his hips in one smooth trail, leaving goosebumps behind.
“Refrain from talking like that,” Megumi threatens.
Sukuna grins. He kneels on the floor and Megumi is struck again by the weight of knowledge- this is the King of Curses on his knees for him, hauling Megumi’s legs over his shoulders and opening his (one, for now) mouth, just for him. Sukuna moves his mouth low on Megumi’s body, where no one else has touched him before with their hands, much less a tongue.
Megumi aches. He doesn’t mind the firm mat beneath his shoulderblades or the fact that his uniform is half-on, half-off, not when Sukuna’s mouth touches his skin like a cool breeze on an August day. Never mind that it’s December and Sukuna is his mortal enemy.
Megumi feels Sukuna licking his ass, that tongue drawing patterns like crazy. The unnecessary slurping noises are profane, thankfully absorbed by the rock walls surrounding them. The mark on his stomach feels like it’s throbbing, pulsating with every lick like it’s pleased. Megumi’s cock is hard, and Sukuna hasn’t even touched it.
“If you knew what you do to me, Megumi,” Sukuna says inbetween licks.
Megumi wants to know, but he doesn’t want to ask. Sukuna doesn’t clarify, his lips sealing around Megumi’s asshole and his tongue delicately spearing him open, just barely reaching inside. Sukuna kisses him passionately, and Megumi feels a swell of heat wash over his face. He feels lust like he never has before, compelled to enjoy this licentious treatment from his enemy. He wonders if it would have been like this with Yuuji, and he is glad he doesn't have to find out. Yuuji would not have Sukuna’s prowess, weird as it sounds since they share a body. Megumi’s head spins when Sukuna forces his tongue deeper, exploring inside him like no one else has ever before. His cock twitches uncontrollably, precum dripping from the tip.
“I can’t believe you’re really a virgin,” Sukuna says gleefully, coming up for air just to suck on his fingers. Before Megumi says anything, Sukuna’s finger is already tapping around his rim, sending more heat through him. And when that finger breaches him, it feels just as good as Sukuna’s tongue did.
Megumi breathes heavily. No witty comeback springs to his lips, only moans, and Sukuna is pushing his tongue in alongside his finger now. The mark on Megumi’s stomach seems happier, less burning, but nowhere near sated. An itch that still needs to be scratched.
“Go ahead and do it,” Megumi says. “I want to get it over with.”
Sukuna’s eyes flash. His second pair of eyes pops out for a second. “By the time I’m finished with you, you’ll be begging me for more.”
Megumi hates how his rim clenches around Sukuna’s fingers when he says that. He is such an insufferable asshole--not to mention the most evil curse ever--but that low voice sends shivers through his body.
Sukuna climbs on top of him, his muscles taut with strength. He guides his cock to Megumi’s ass. “Brace yourself,” he says with a smile.
It isn’t like Megumi isn’t physically ready, but the mental side of it is something else to process. He can’t believe this is something that he’s allowing--barely--to happen. He’s aroused more than he’s ever been. This is something that he wanted, but couldn’t have. Something that Megumi is sure he’ll have to compartmentalize later.
But for now, he looks down at the black mark on his stomach and the tattoos on Sukuna’s body and he lets his breath carry him into his next motion -- that of giving in. He relaxes, and that’s when Sukuna thrusts into him.
Megumi gasps. It’s a lot. His knees, bent up for easier access, squeeze Sukuna’s waist so hard he can feel his Sukuna’s ribs with his calves.
“Shhhhh, shh, it’s alright, Megumi,” said Sukuna, petting his sides.
As Sukuna moves, pushing further in, Megumi feels wrong that it feels so right. He closes his eyes and feels, distinctly, how the tightness, the itch in his abdomen lessens the more that Sukuna touches him. He’s shocked by how slowly Sukuna is moving, truly easing him into it. He feels so full.
He props himself up on his elbows to watch, needing to see what Sukuna is doing. But he hasn’t thought it through, which is unlike him, and the movement brings his face so close to Sukuna’s. He notices the crisp edges of each dark tattoo.
“If you wanted a kiss,” Sukuna mutters in a low voice, and before Megumi knows what’s happening Sukuna’s mouth is on his. On instinct, he shuts his eyes and drinks in the feeling like a cold soda on a hot day. Then Sukuna’s tongue is in his mouth, too, and Megumi splutters around it as it pushes inside him just like Sukuna’s cock. It’s a wet and sloppy kiss, but Megumi can’t deny how much he loves it. Sukuna licks inside Megumi’s mouth like a dog, and Megumi foggily responds, his own tongue moving andtwining with Sukuna’s.
Sukuna keeps moving inside him while they kiss. Megumi feels his cock carving into him, thick, and he’s never felt so good and so overwhelmed. He’s out of breath and out of his league. Pleasure spikes through his body, wavering through different parts--his mouth, his ass, his stomach, his neck--like a storm of ecstasy.
He doesn’t last long. WIth heady desire coursing through his veins and Sukuna licking his face and neck like a starved animal, Megumi cums. It’s the buildup of all the emotions he’s been holding onto since his first and only fight with Sukuna, one that left him with a righteous anger that has not dissipated since. The mark on his abdomen starts to fade. Sukuna says something filthy, but his eyes are glazed over with arousal just the same as Megumi.
When Sukuna cums in him, the mark over his abdomen has almost disappeared. Megumi feels cold clarity wash over him, all too aware of the thick length inside of him and the circumstances and decisions that led him here. His ass is still spasming around Sukuna’s cock, milking the last drops out.
A loud squeaking noise erupts from the doorway. Megumi glances over and wishes he hadn’t. It’s that disgusting curse.
Without looking away from Megumi’s spent body, Sukuna lifts one arm and kills it.
“It was watching the whole time,” Sukuna says, sounding satisfied. His cock is growing softer inside Megumi until it slips out entirely. Now, the mark over Megumi’s stomach is definitively gone.
“Why did you--” Megumi says, his face hot. Because he realizes now, with the heavy fog of heat lifted, that Sukuna could have exorcised the curse anytime he wanted; of course he could have, but he chose to fuck him instead.
“You could have killed it if you really wanted to, too,” is all Sukuna says, sticking out his tongue. He sits up and re-dresses himself. “Good luck with the finger. See ya later.”
Megumi’s mind spins during the few seconds he has to himself alone, after Sukuna leaves but before Yuuji fully returns. He frantically buttons up his uniform, but not before noticing the love marks that Sukuna managed to leave on him.
What the fuck was that? The heat that had taken over his body is unthinkable to his non-altered mind. What could have possessed him to enjoy fucking Sukuna? Why, even though he was no longer under a curse, did he want to do it again?
Yuuji breaks the silence, returned to his body. “Megumi… What happened?”
Megumi rolls his eyes to the side. Good old Yuuji. He always has a way of bringing him back down to earth. “Don’t ask.”
It’s not going to be the last time Sukuna forces his own goals through using Yuuji’s body. Megumi only hopes the next time it’s something equally ineffectual, from a pragmatic standpoint.