Work Text:
Shouto shows him an article on lunch break after they’re done with their internship for the day.
Katsuki squints at it.
Save the Turtles, the title says. And then there’s some stuff about what kinds of common household objects aren’t biodegradable and how you can replace them with more durable alternatives that are also eco-friendly, and—
And Katsuki fails to see how the same plastic tupperware he’s been using since middle school is particularly harming the environment, and he plans to tell Shouto that, but.
Then Shouto opens his mouth and says, “We shouldn’t use condoms anymore.”
“Hah?” Katsuki spits.
Fucking Shouto’s pussy is the greatest joy in his life. And he worked damn hard for the privilege, thank you very much. He grinds the damn buckwheat himself for the pretty princess’s soba.
So. No stupid turtles are going to keep him from Shouto’s sweet little pussy.
“I just,” Shouto says. “Well, you know. Now I feel bad. That we’re, um, contributing to the problem?”
“Tough luck,” Katsuki huffs. “The damn turtles will have to make do.”
"But Katsuki," Shouto whines. "Think about the poor turtles."
Katsuki sighs. He can't believe stupid turtles are getting in the way of him getting his dick wet. Not that he was actually getting his dick wet but—you know. It was pretty nice even with the condoms.
"So what?" he huffs. "We just can't have sex?"
Shouto bites his lip. "Um," he says. "Well, you could fuck my pussy raw? If you want?"
Katsuki whips his head up from his lunch so fast it’s a wonder he doesn’t snap a tendon. “What?” he asks. “Say that again?”
Shouto chews at the inside of his cheek some more. He’s embarrassed. Cute.
“Well, uh,” he says, “I’m not letting other alphas knot my pussy, and you were my first, so. And I figured I was your first too? You, um, certainly finished appropriately.”
Yeah, because he’d just put his dick in the warmest, softest, tightest thing he’d ever felt, and he was looking at Shouto’s pretty face, so of course he went and knotted like a loser as soon as Shouto was stretched enough to let him push all the way in.
“It’s hard work,” Katsuki huffs. “I did my best.”
“I wanted to feel it,” Shouto confesses. “When you came, I got so sad that I couldn’t feel it filling me up. I wanted your come in my pussy. I wanted you to plug me up, after. And I thought it was stupid, because we’re so young, still, and you want to be a top hero, and—”
“Want you more,” Katsuki blurts, like a loser. “You know that, right?”
Sure, fame and glory are nice things, and Katsuki takes pride in being the best, but, you know.
He hadn’t actually had omega pussy back when he thought that was as good as it got.
And now he knows what Shouto sounds like with his nails digging into Katsuki’s back and his pussy stretched on Katsuki’s knot.
He knows how he says please and he knows what he sounds like whining harder, Katsuki and he knows just how sweet he purrs when Katsuki pulls him to his chest after, when he kisses his sweaty forehead and tells him he did well for his alpha.
So who cares if fucking Shouto’s pussy raw’s got consequences. Katsuki wants the stupid fucking consequences. They’re so close to graduation, anyway. Katsuki’s already eighteen. Even if he gets Shouto pregnant, they probably wouldn’t have to tell anyone until they’re decently safe from giving Aizawa-sensei a spontaneous heart attack.
“Oh,” Shouto says. “I wasn’t sure. I mean—your eyes do get really soft when we cuddle. And that one time when I had a fever and told you that you smelled nice, you didn’t even call me a stupid bastard, or anything.”
“You’re not a stupid bastard,” Katsuki says. “You’re the best thing in my life. And I’m gonna keep you forever.”
“You’re affectionate today,” Shouto says, all pleased. “I guess you really don’t mind doing it without condoms?”
And—
Because Katsuki’s all of eighteen, and an alpha, and if anyone’s the stupid bastard here, it’s him, because his brain really does feel about as mushy as he imagines Pikachu’s does when he overdoes it with his quirk, instead of handling it with any minimum amount of grace, he says, “Ask me again, half ‘n half. Do it real nice.”
“Um.” Shouto blinks. “Please, alpha,” he says. “Will you fuck my pussy raw?”
It’s a wonder of pure self-restraint and godly patience that Katsuki doesn’t come in his pants right there.
His cock twitches so hard he half wonders if he just did. But when he steals a quick, embarrassing glance down at his lap, thankfully there’s no wet spot. Okay, so. He’s hard. He can always tuck that into the waistband of his boxers, or something.
Being hard because Shouto, like, exists is not particularly new to him.
He’s got a bunch of coping strategies by now.
“Shit,” Katsuki says. “Yeah, Shouto, I really want to.”
“I think it’ll feel good,” Shouto says, taking a little bite of his food—that Katsuki made for him, he’s so damn spoiled—like they’re discussing the weather. “I can’t wait to see.”
Katsuki feels lightheaded. He’d bend Shouto over right here and fuck him in the damn canteen while other people munch away at their lunches if he didn’t want anyone else to look.
Shouto’s for him. He’s Katsuki’s, so nobody else should even get to look at him. Because he’s for Katsuki. Because that warm little pussy was made for him, and now Katsuki is going to put his come in it and fill him up, and it’s okay if Shouto gets pregnant, because then he could just. You know. Stay home and be Katsuki’s cute little wife and say welcome home, alpha all sweet each day when Katsuki returns from a long day of Providing.
That—
It’s dumb to dream of, but it would be pretty nice.
Shouto waiting for him at home like a dutiful wife. He can go ahead and burn dinner every single day. Katsuki doesn’t care.
“I’ll fuck you good,” Katsuki blurts. “Okay?”
Shouto nods. “You always do,” he says. “Don’t worry about it, alpha.”
But the thing is—
Katsuki does worry about it. He always worries about what it takes to make Shouto feel good, whether that’s yet another plushie he doesn’t really need at the arcade because his bed is already stuffed full of them, or some warm soup because went and caught a cold, or, you know. Bending him over Katsuki’s lap and fingering his pussy until he squirts because he’s all wound up and he’s being a stubborn little brat and won’t say what’s bugging him.
Katsuki is there to help. To be a good alpha and take care of his omega. And he’s not going to be one of those losers who thinks a thick knot makes up for all the other stuff, so.
Yeah, he does worry. In general. But he definitely worries about making it good for Shouto, his first time taking a knot raw.
All that instinct shit is important to omegas, isn’t it?
Shouto always gets all emotional and cries and begs Katsuki for pups during his heats.
Shouto trusts him. He trusts Katsuki. And Katsuki’s not gonna waste that.
“You’re important,” Katsuki huffs. “And I’m the alpha. It’s my job.”
“I’m a job?” Shouto pouts. “And here I thought you liked spending time with me all on your own.”
Like is too small a word, and the little brat knows it damn well.
So Katsuki leans across the table and pulls Shouto in with a hand cupping the back of his neck, and he presses a kiss to Shouto’s forehead right there. Let the extras watch this bit. He doesn't care.
(Shouto is more important.)
“You’re mine,” Katsuki huffs. “It’s not work, but you are my—my fucking everything, okay? Just. You’re mine, Shou. Gonna bite you. Gonna mate you. Gonna put it so deep in your little pussy that it takes and you give me pups.”
Shouto gets all pink. They’re still so close. And they’re in public, and Katsuki’s maybe running his mouth, and he can’t figure out how to stop running his mouth, but. It’s important that Shouto knows.
And if saving a few stupid turtles from the evils of plastic waste is what it takes, well, then. Give him a fucking hat. He’ll sign up. He’s fighting for a good cause. And he’s getting pussy for his efforts.
“Katsuki,” Shouto says carefully. “Are you doing all this just to get me pregnant? You really don’t care about the turtles even a little bit?”
Oh, fuck, he’s going to pout with those big doe eyes of his all wide, isn’t he?
Which, to be fair—
Shouto looked so happy when they went on that aquarium date. And he really liked the turtles. He spent so long just standing there looking at them. And Katsuki got to snap a few candids of him smiling so big it made his chest hurt. Which would not have happened, ontologically, without turtles in the world.
So.
“I care if you care,” Katsuki says. “Sure, maybe I don’t get all that stuff like you do, and I don’t think one human being is supposed to care this much about everything all the time, because if it were me, I’d go fucking insane, okay, but—but you do. And I get it when it’s you. And, fuck, I love that you care about everything and you cry about squished oranges in the store if your heat is coming up, because you’re all emotional nobody will want them, so then we have to get them and you make juice for everyone at the dorms.”
Shouto blinks. “Oh,” he says. “I didn’t know you actually, um, loved stuff about me?”
“I love you,” Katsuki huffs. “So it’s not that far off.”
“Well,” Shouto pouts. “You didn’t bring it up until now.”
Katsuki laughs. “My bad,” he says. “Sorry princess. Your alpha loves you very much.”
“I don’t know how much I love him yet,” Shouto says, because he’s a damn brat. “He’s going to have to knot my pussy first. Then I’ll have all the data I need for an objective assessment.”
Spoiled little brat.
Katsuki could just toss him over his shoulder and take him back to the dorms. But Shouto’s only halfway through his bento, and he’s going to pout about all that hard work going to waste, and how Katsuki made it for him, and then Katsuki probably won’t actually get to knot his sweet little pussy raw, so.
That bodes well for precisely nobody.
“You wanna go home?” he asks. “To collect your missing data?”
Shouto bites his lip. “My heat isn’t that far,” he says. “What it if, um, really takes?”
Katsuki runs his tongue over his canines. “Then,” he says. “I’ll be a good alpha and take responsibility, princess.”
“Oh,” Shouto says. “Okay then.”
And then packs up his leftover bento all on his own like a good boy.
...
(It doesn’t take that long to get home. And, okay, maybe that’s because Katsuki doesn’t even deign to wait for the bus and scoops Shouto up into a princess carry and just uses his quirk instead, but, you know. Who’s to say knotting Shouto’s pussy isn’t part of his civic duty, really?)
...
It’s warm.
Shouto’s warm, and he’s got these little tears in his eyes that won’t quite fall, and every time Katsuki pulls out just to push back in, his knot swells more, and Katsuki’s glad for all that practice fucking Shouto with a rubber, because, shit, if this was their first time, he’d probably embarrass himself so much worse than he already did.
“Close,” he says, nudging Shouto’s clit with his thumb. “I’m so close, princess, fuck, really going to fill your little pussy up with my come.”
“Do it,” Shouto whines. “Do it, alpha, come on.”
And then he clenches tighttighttight, and Katsuki rubs him through it, and then his knot pops, just like that. Warm and snug in Shouto’s pussy.
“That was nice,” Shouto says. “I feel so...” His nose scrunches. “Sated? I don’t know, but it feels really good. I could float. Like Ochako’s quirk, you know, but just—because I’m really happy?”
“I’m glad,” Katsuki says, shifting them so he can spoon him while his knot settles. “I had fun saving the turtles, half ‘n half. We should do it again.”
Shouto lets out a little huff. “My alpha is so selfless,” he says, pinching Katsuki’s wrist.
But he snuggles into him, content enough to start purring, so, really, all’s well in the world.
The damn turtles included.