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Kacchan has an addiction. Izuku would throw him an intervention if it weren't so embarrassing.
"Kacchan," he whines. "I'm trying to study."
"Then study,” Katsuki says from where he's crouching between his legs. "I don't need your face."
"This is very distracting."
"Yeah," Katsuki says, humour laced in his voice, as he leans forward to press his nose into the crease of Izuku's thigh through his shorts. "It is.” He licks Izuku through the fabric of his shorts, and he lets his head drop back against his desk chair.
"Kacchan," he says, but any admonishment in his voice is immediately undermined by the way he lifts one of his feet to rest on Katsuki's shoulder, opening himself up more.
"C'mon, Deku," Katsuki murmurs, hot breath against Izuku's crotch making his toes curl. "Just let me taste you a bit."
Yeah, sure. Izuku's heard that one before. ‘Just a bit' always turned into at least two orgasms ripped out of Izuku before Katsuki finally fucked him until he cried (assuming he wasn't already).
Despite being perfectly aware of this, Izuku doesn't put up any more of a fight. He lifts his other leg and rests it on his desk, and Katsuki yanks him forward more so his ass is hanging off the edge of the chair. He pulls Izuku's shorts off but leaves his underwear, pressing the flat of his tongue against Izuku's cunt through the fabric. "Take them off," Izuku whines, squirming. Katsuki grins up at him sharply.
"No," he says. "Wanna make you soak through them."
Izuku whimpers as Katsuki goes back to licking him through the fabric of his underwear. The part of Izuku’s mind that isn't getting increasingly horny and desperate wonders if he's not bothered by the threads that are probably getting on his tongue.
It's not enough, of course. Katsuki’s hot mouth is so close to where he wants it, and each teasing swipe of his tongue winds Izuku up higher and higher without giving him any relief. Izuku wiggles his hips more, groaning when Katsuki's hands come up to grope at his ass and keep him still. Katsuki sucks at Izuku's clit through his underwear, and Izuku is thirty seconds away from begging.
Katsuki lets out a deep rumble of pleasure from between Izuku's legs; he pulls back and runs his thumb over the crotch of Izuku’s underwear that is now soaked through with Katsuki’s spit and Izuku's arousal. His thumb rubs at the sticky fabric before he puts it in his mouth. Izuku blushes and covers his face with his hands as Katsuki finally slides his underwear down and lets them drop to the ground, utterly uninterested now that he has what he wants spread out in front of him.
"Fuck yeah, baby," Katsuki says appreciatively. He lifts Izuku's hips up more and drags his tongue through lzuku’s slit. Izuku cries out and grabs a handful of Katsuki's hair, his other hand flying up to grab the back of his chair. Katsuki is so fucking good with his mouth, and he's always so enthusiastic when he eats Izuku out, moaning as if Izuku was the best thing he’d ever tasted (Katsuki always adamantly insists that he is).
"Kacchan,” he pants, as Katsuki gently sucks at his clit. "Oh, shit—”
"Taste so good, Deku,” Katsuki says. "Love how fucking wet you get for me."
Izuku brings his arms back up to hide his face. "It’s embarrassing." he mutters, as Katsuki laps at the slick that’s staining Izuku's thighs.
"No it's not," Katsuki says emphatically. "It’s hot as fucking hell.”
Izuku doesn't argue against this because he knows there's no point. Instead he keeps his face covered so he can muffle his noises. The sounds that are coming from between his legs are obscene, and Izuku's overactive brain very unhelpfully provides the word 'squelch.' There's an awful lot of squelching, and Katsuki keeps letting out rumbles of satisfaction as if he were dying of dehydration and Izuku's pussy was single handedly bringing him back to life.
Katsuki gets him off quickly and efficiently— he always does. He likes to get the first orgasm out of the way so that Izuku is pliant and loose, and Katsuki can really start having fun.
Kacchan is a menace and one of these days Izuku is literally going to orgasm to death.
Izuku bites down on the fleshy part of his hand when he comes, trying to be quiet while he still has the mind to do so. Katsuki pulls back and leers up at him; Izuku looks down and immediately regrets it.
"Oh my god," he whines, flushing from his ears down in humiliation at the sheer amount of wetness staining Katsuki's face. "Kacchan, your mouth."
"Fuck yeah, my mouth," Katsuki says, tongue licking at his lips and the parts of his face he can reach. "Get on the bed, my fucking knees are killing me." He pops up onto his feet and drags Izuku up, and then he pulls him into an absolutely filthy kiss. Izuku whimpers at the onslaught of Katsuki’s tongue and teeth and the overwhelming taste of himself. "See how good you taste?" Katsuki mutters into the kiss, one hand coming up to Izuku's chin, holding it gently. "So fucking sexy, Izuku." Another deep kiss before he says, "Get on the bed, on your back. Not done with you yet."
Izuku goes up on his toes to kiss him again. The taste of himself is still embarrassing, but he's willing to put up with it if it means kissing Kacchan. "Are you gonna fuck me?"
"Maybe," Katsuki says. "If you're good." He ignores Izuku's pout and pushes him towards the bed. Izuku goes where he's told, too horny to be a brat right now. His thighs rub together and spread slick everywhere, and he winces at the feeling.
He lies down and props himself up on his elbows to watch Katsuki. Izuku can see the bulge in his sweatpants, the indisputable proof of how much he liked eating him out. Izuku's hungry eyes rove every inch of his boyfriend, and it doesn't matter that he just came— he wants Kacchan everywhere.
"Kacchan," he whines. Katsuki grins and stalks to the bed, but he goes to his stomach and buries his face back between Izuku's legs.
"Ka-ahh," he trails off in a moan as Katsuki's tongue works its way inside him. He's meaner with it now, never staying where Izuku wants him, riling him up and then pulling away, placing warning bites on his thighs or his clit when he complains too much.
Izuku keeps rolling his hips up, trying to get Kacchan where he wants him. Katsuki curls his arms around Izuku's thighs and keeps him pinned to the bed, relentless with his tongue. Now that he has more control over Izuku's movement he stops fucking around, and soon enough Izuku is coming again, Katsuki's name falling from his lips.
And Katsuki doesn't stop. Izuku cries out and squirms desperately, trying to get away from the mouth Katsuki so loved to use as a weapon. "Kacchan," he whines; red eyes peer up at him, but Katsuki doesn't let up, even as tears start to spill over Izuku’s cheeks. "Kacchan too much, too much—”
Katsuki pulls back. "You can take it," he says. Katsuki won't let up unless Izuku says the safeword, but he’s never really needed it much (the last time he used it was because he got a charley horse in the middle of sex). Izuku just likes to complain.
"Whiny bitch," Katsuki says fondly, when Izuku just continues to whimper. He keeps one of his arms wrapped around Izuku's thigh, but the other one he moves, sealing his mouth over Izuku's clit as he slides two thick fingers inside of him. Izuku cries out hoarsely, completely unconcerned with his noise level now; with only one of Katsuki's arms keeping him pinned he has a bit more range of movement, but no matter where he squirms he can't get away from Katsuki’s vicious mouth and probing fingers. There's no relief; his orgasm has barely abated before he can feel another one building, as Kacchan forcibly pushes him back to the edge.
It's so much. It’s too much. Izuku is sobbing and begging, although for what he's not sure, since he's asking Katsuki for more just as often as he's asking him to stop. Katsuki is three fingers deep now, sucking hard on his clit as he fingers Izuku, and if there was anyone left in this dorm who didn't know they were having sex, they do now. Izuku doesn't even know half the shit he's saying; it’s a frantic mix of Kacchan and please and oh god more and oh my god I'm gonna, and then a hefty bit of incoherent sobbing. Something big is building inside of him, and he writhes beneath Katsuki as it builds up bigger and bigger until Izuku thinks he's going to explode.
And then he does.
His orgasm hits him like a goddamn tsunami, crashing over him as his back arches off the bed. Kacchan's mouth pulls back but his fingers don't stop, and Izuku comes so hard it bursts from him, squirting all over the bed and his boyfriend's face.
"Holy fuck," he dimly hears Katsuki say, but Izuku is still shaking through his aftershocks, so he doesn't see the hungry, awestruck look on Katsuki's face. "Holy fuck, Deku, you're so fucking hot— I need— shit—”
Katsuki crawls back up so he's hovering over him and pushes his cock inside of Izuku's soaking cunt. He uses Izuku like a sex toy, and Izuku plays the part well, still so fucked out and loose from the intense orgasm he'd had that he barely even notices that Katsuki is fucking him until he shoves his face in Izuku's neck and comes.
Izuku isn't sure how long they stay there, with Katsuki collapsed on top of him and Izuku's legs and arms looped lazily around him.
"Are you dead?” Katsuki mumbles into his neck.
"I think so," Izuku replies. "At least I died doing what I love."
Katsuki snorts. "Coming on my face?" He rolls to the side so he's not completely on top of Izuku, but they stay firmly tangled together. "That'd be a good way to go,” Katsuki says sleepily. "Drowning in your pussy."
Izuku turns red and stammers. "Kacchan!” He snickers in Izuku's ear. "It’s not funny," he moans. "The bed is soaked."
"Damn right it's not funny. It’s the hottest thing I've ever seen."
"I—” Izuku hides his face in Katsuki's shoulder. "Do you really think so?"
Katsuki pulls back and runs careful fingers over his jaw. "Deku," he says seriously. "I'm gonna jerk off to the thought of you squirting on my face for the rest of my goddamn life."
And Izuku is willing to accept that, but still—
"I made such a mess!"
"So we'll put a towel down next time," Katsuki concedes. "And we'll sleep in my room tonight."
Izuku pouts, insecurity still tearing up his chest. "You promise you don't think it's weird?"
"Of the very long list of things about you that I find fucking weird, this isn't one of them."
Izuku giggles, comforted by Katsuki so close and tactile, well aware his boyfriend doesn't say things he doesn't mean. Katsuki kisses him deeply and then ruffles his hair.
"I'm tired," he says. “Let’s go upstairs. We'll strip the bed tomorrow.”
Izuku takes his hand and lets Katsuki pull him up. “I guess I'm not studying anymore tonight," he says, only half joking. Katsuki rolls his eyes, but he pushes Izuku's curls off his face.
"You're gonna do fucking fine, nerd, but if you're that fucking concerned we can wake up early and I’ll help."
Izuku visibly brightens. "Really?"
"I—” Katsuki is giving him a look that he gets sometimes; it’s Izuku’s favourite. It's a look like Katsuki can't quite believe that Izuku is real. "Yeah, obviously." His tone is brusque, but his ears are pink. Cute.
Izuku throws his arms around Katsuki's neck and hugs him. Kacchan could wring three orgasms out of him, but it was these moments that Izuku loved the most.
"I love you," he says. Katsuki smacks his ass.
"Clean yourself up so we can go to bed," he says. He kisses Izuku's cheek and tries to move away, but Izuku hauls him back.
"Say it back," he orders. Katsuki raises an eyebrow, faking unimpressed.
"The three orgasms wasn't enough?"
"Kacchan," Izuku says patiently. "I just squirted on your face. Tell me you love me."
Katsuki’s eyes turn hungry at the reminder. "Fuck yeah, you did,” he says leaning down to give Izuku a kiss that is mostly teeth. "I fucking love you."
Izuku smiles, mollified. "Let me get a towel and a new pair of shorts and we can go upstairs."
"You wear shorts into my bed," Katsuki warns, "my sheets are gonna get just as soaked."
Izuku gives him a flat look. "You can't control yourself?"
Katsuki grins like a predator. "Not around you."
"Is that supposed to make me feel better about wearing pyjama pants in July?"
"Does it?"
Yes, is the fucking annoying thing. Because Kacchan was the strongest person he knew, and Izuku could bring him to his knees with a pair of shorts.
"Shut up," Izuku mutters, which is all the answer Katsuki needs. He laughs, harsh and sharp-edged, but the kiss he places on Izuku's forehead is the gentlest thing he's done all night.
Katsuki helps him clean up and they head upstairs. Izuku is wearing what he hopes is a safe compromise, a pair of gym shorts that go nearly past his knees. Judging from the way Katsuki immediately slides a hand up Izuku's thigh when they're spooning in his bed, it's not as safe as he'd thought.
"Kacchan," he chides.
"M'not doing anything," Katsuki mutters into his hair.
"You're thinking about it."
"If thinking about fucking you is a crime than I should have been locked up ages ago."
Izuku tries and fails not to let this flatter him. "Your libido is going to make me fail out of school," he complains.
"Then I'll just have to make you my cute little house husband," Katsuki says easily. "You can do the dishes and water the plants and then bounce on my cock when I get home from being a pro-hero."
Izuku can't help it— he bursts out laughing. Katsuki makes a noise like a deeply offended bird. "Fuck are you laughing at, shitnerd?"
"The idea that you could ever be happy with a docile little house husband," Izuku says.
"Maybe," Kacchan admits. "Guess it’s as stupid an idea as you failing out of school because you flunked a test that you're probably gonna ace anyway."
Izuku rolls his eyes. “Yeah okay, point made."
"Who's making a point? I’m still thinking about you waiting for me at home. I could dress you in a maid costume."
Izuku giggles. "Oh my god," he snorts. He rolls over so they're facing each other. In the dim moonlight that filters through the crack in the curtains, he can just make out the soft, fond look Kacchan only got when he thought no one could see. Izuku leans in to kiss him. "You know, Kacchan, we could still do all that. Coming home to ride you will likely be a very effective way of releasing tension and self-care."
"Did you really just say that bouncing your cute ass on my dick is self-care?"
"Yes," Izuku says unabashedly, as Katsuki's hand slips down the hem of his shorts to grope aforementioned cute ass. "Self-care is important, Kacchan."
Katsuki makes an unintelligible noise and rolls on top of Izuku.
They don't wake up early to study. Izuku passes anyway.