Work Text:
"Kacchan!"
Three knocks on the door disrupt Katsuki's quiet evening. A brief confusion furrows his brows, but he doesn't bother to stop reading just yet. He takes his time getting to the end of the page before marking where he was in his studying, then goes to open the door.
He looks to where he normally would- a few inches below himself- only to curse inwardly when he remembers their situation. Katsuki lifts his chin to look up at his own face, smiling brightly, and he isn't sure if what he's feeling is hatred or fear. It might be both.
"What the fuck. Don't do that with my face." He deadpans, staying in the doorway. Deku's face turns into a frown that looks more like a pout on his borrowed face, and Katsuki decides that's at least better. "What do you want?"
"It's Friday!" Izuku says, adjusting their favorite soda and a few bags of chips in his arms. He looks surprised. Katsuki can't help but think his face looks stupid like that. "Date night!"
"What." He says flatly, scrunching up his nose. "Really?"
"Yeah! Just 'cause we're all switched out doesn't mean I like. Love you any less." Izuku smiles sheepishly, laughing in his self consciousness. Katsuki feels his face go pinker than what he's used to and makes a sound of displeasure, holding his cheeks in rougher hands than he normally has. Deku's body blushes too easily.
"Shut up, moron. Come on." He guesses this might as well happen. As if swapping bodies with someone wasn't weird enough, it only makes sense that it was with his boyfriend, who still wants to see him multiple times every day… Then again, it could be worse. Could be Mineta.
Izuku does his normal routine of locking the door behind him and sitting on the floor, so that his back is against the bed. He sets the drink and snacks out, spreading them so that they each have their preferred foods. It's a bit of a ritual- Friday nights are always date nights. Katsuki isn't sure why he thought it would be any different this week, actually. Of course his sappy, overzealous, adorable boyfriend would want a night in with him when he's stressed.
It's been three days since they were both hit with a quirk that swaps out their bodies. It's been… Weird, to say the least. Katsuki never realised how much broken bones hurt, but after breaking up to his goddamn shoulder, he has a new level of respect for Izuku- not that he'd ever say that so blatantly. On the other side of the coin Izuku has been struggling with his quirk in a similar vein: he's dislocated his shoulder on multiple occasions already, and yet he isn't using even half of his quirk's power. It pisses him off to see, but he understands why he is after using Izuku's quirk a few times. They're both working hard, even if they have more to work through at the moment. Katsuki opens up a bag of his favorite snacks. Fridays are cheat days.
"So! I brought three movies. One is a cheesy romance I know you'll love, this one is a really high rated villain and hero get together story, and our old favorite All Might m- Kacchan?!"
Katsuki coughs and wheezes, fanning his mouth as his eyes water. Holy fuck, that was hot. Izuku rubs his back gently and passes him the drink. He can't drink fast enough, and he curses under his breath as he pushes the offending snack away.
"I'm sorry! I should have thought about that!" Fucking Deku says as Katsuki rests with his mouth open to cool it off more. He gets a glare as Katsuki pushes a movie towards him without looking.
"Shut up, idiot, you couldn’t have known. Just go ahead and put it in." He swipes some of the snacks that he knows are Izuku's favorites and gets to snacking. He doesn't bother to try and figure out just how the hell the sugary bullshit he hates in his body tastes a little better in this one. Deku puts the movie in, and tentatively comes back to his side to try the takis that had put his boyfriend through such duress. Katsuki assumes by the fact that Izuku does not immediately die that they are fine for him. Katsuki is mildly pissed off.
But, the movie is starting. It's the blatant, mushy love story that Izuku had said he would like- and as much as he hates it, he's pretty sure that's true. A few minutes in and the soundtrack already has him hooked, eyes on the screen as he tries his best to be absorbed into the protagonists' budding romance, and not the fact that there is an arm slipping around his shoulders ( like Katsuki normally does to Izuku ) or that he's sliding too naturally to settle against his boyfriend's chest ( like Izuku normally does to Katsuki ).
This is fucking weird.
It's not bad, but it's… Different, being on the other side of the dynamic. It's not very often he gets to feel small and. Protected, is maybe a good word for it, he supposes. But stupid Deku has grown a few inches in the last year, unlike Katsuki. This might be strange now, but it might damn well be their future.
Katsuki sighs and rests his cheek against his own chest. Even though it's his own body, it feels nice, just because he knows it's Izuku. A hand finds his side and he settles a little closer, paying more attention to how nice it is to be held than the actual movie, now. This isn't the worst at all, he thinks, but it only gets better when Izuku strokes up along the arm that still aches occasionally, despite being fully healed. His breath tickles the top of his head and Katsuki spreads his hand to press flat against the other's chest. His heart sounds the same, he realises when his eyes are closed.
He feels a kiss pressed against his forehead. Amusement fills his chest at the reversal even in their affectionate gestures, and he responds in kind by kissing his chin back. They haven't really been with each other like this since their bodies were switched. It's all Katsuki can think about as he feels his jaw being tipped up, lips pressed against his and- okay, what the fuck. That's really goddamn weird. Is that how his mouth feels? Is that what Izuku feels whenever they kiss?
"Kacchannn," Izuku whines as he presses their foreheads together. "I haven't gotten to love on you for days. Don't get in your head now."
"I'm not- how can you be so relaxed about this?" Katsuki doesn't open his eyes. If he just closes his eyes, he won't see his own face, he can just imagine a taller, slightly leaner but still incredibly toned and sexy Izuku. That, he can deal with. "I feel like just existing in the same room as you is like being transported to my personal episode of the Twilight Zone."
"If we're both going through the same thing, it isn't personal." Deku points out, and giggles when his cheek is pinched. "Kacchan, I'm just saying! If you're feeling weird, I'm probably the only person in the world who could understand, you know?"
"And yet you don't. Bitch." Katsuki sticks his tongue out. Izuku just laughs and kisses the corner of his mouth with his hand cupping his jaw, trailing kisses along his cheek like he always does when he's trying to chance his mind. There's a strange reassurance in the fact that still feels more or less the same. Katsuki turns a bit into him and rests his hand on his arm.
"I do, though. I'm just more curious than you are." His tone is playful in his ear. Katsuki almost flinches- having all of his hearing back is something he's still not quite used to, and Izuku is. Well, using his voice. There's something uncanny about his voice with all of Izuku's inflections. He kisses the corner of his jaw and pulls him a little closer. "Don't try and tell me you aren't a little, too."
"Curious enough to make out with myself? No thanks, you damn narcissist." His face feels hot as hands find his waist, playing with the edge of his shirt, and he feels his breath stop for a second as he realises exactly what his stupid, disgusting, perverted boyfriend means. "Deku."
"Hm?"
"We are not fucking when we're like this."
"Baby!" He sounds a little flustered. Katsuki still refuses to open his eyes but smirks a little bit. "It's been weeks since we've gotten to touch each other. I'm gonna starve to death."
"Can you not control yourself? Keep it in your pants for just a few more days you little freak." Izuku starts kissing his neck in response, which still feels good in this body, because fuck him of course. Katsuki regrets his determination to keep his eyes closed.
"How am I the freak here? It's your body that's getting all weird." Katsuki shivers at a particularly sweet kiss where his chin meets his throat. His heart skips a beat, and the warmth in his face spreads to his neck. This fucking bastard is using his own tricks against him! "It's like I can't keep my hands off of you."
"You better figure out a way to," Katsuki's cut off when Izuku nips gently at his pulse, hands sliding under the tank that fits oddly on his borrowed body. "This is not consensual, I wanna make that very fucking clear right now-,"
Izuku is giggling into his neck because they both know that's not the truth. They both know that if Katsuki didn't want to, it would be different. Izuku would be blasted through the wall and not letting his fingers creep up to his chest, as light as a feather, just the way Katsuki does to get him worked up. It's working.
"You don't mean that, Kacchan." His voice is rough and low and distinctly Deku when he says that. He presses a kiss to his collarbone as he adjusts Katsuki in his lap, hand on his thigh as he tugs him to straddle. "You miss me too. I know you need to let off steam every once in a while."
"Not by becoming your little science experiment." Katsuki grunts as he feels his hands go higher, his stomach doing flips. Izuku's chest isn't as- pronounced as his own is, but it's a feeling he's familiar with. Something he secretly adores, especially when Izuku bundles up the fabric around his chin to keep it from falling down. Katsuki rests a hand on his shoulder and the knee behind him for balance when he feels his boyfriend duck his head.
"You're my boyfriend first and foremost." He says with a kiss pressed directly in the center of his chest. Katsuki pulls at his shirt slightly while Izuku takes his goddamn time making his way to one of his nipples. He hates that he feels so warm already, and it feels fucking weird to think about the fact that this is Deku's body feeling that way. "Besides- I think knowing what makes your lover feel good isn't a disadvantage."
"You don't need to convince me." He mutters. "But I'm gonna fucking use this against you the next time we do this."
Izuku giggles and finally drags the flat of his tongue against him, and Katsuki can't help but feel fucking betrayed. This was his favorite part- his favorite fucking part- and of course Izuku's body feels different now. He's not sensitive to it at all! It feels nice, he guesses, but it's nothing like what he's wanting. He curls his fingers in his shirt and Izuku laughs. "No good, huh?"
"This is just fucking frustrating." Katsuki scowls as he shifts unhappily in his lap. Izuku hums and kisses more up his throat, connecting their mouths once again, and he has a little bit less of a problem with it this time. His hands stay tight in his shirt- he's pretty sure he'll never be ready to touch on Izuku the way he's doing to him right now.
After a few moments of distraction and obvious thought, strong hands get a good grip on his ass. It's enough to make him squeak in surprise. Pretty much no one but Deku has touched his ass, ever, and it's fleeting pats- yet here he is, two hands groping at him like he's nothing more than a prize. He feels his cock twitch in his pants. Izuku smirks against his mouth. He bites his lip.
"That feels good, right?" He breathes out against him. He pulls him forward a bit, just a little bit of friction between them to get started, while his hands slide under his boyfriend's sweats. His hips, his ass, his thighs, all squeezed and caressed until finally Izuku cups him through the front of his boxers. He feels kind of humiliated, and he doesn't know what to do under the attention. This definitely isn't how they usually do things. "I know it always makes me feel good when you do this."
"What the hell do you think you're doing," Katsuki grunts as he presses him back against his bed for a more forceful kiss, tongue sliding along his lower lip while his hand scratches lightly over what he can through the top of his shirt- just like he likes Izuku to do to him. They both sigh out in satisfaction.
"Showing you how nice you treat me." It's all the answer he gets before they're trading wet, open mouthed kisses, soft groans filling the room as they lick into each other's mouths with increasing fervor. This- okay. This is… A little nice.
It's new, it's weird, it's fucking surreal. But at the same time, he can't stop himself either. His hands tug at Izuku's shirt- as strained as it is at the shoulders despite having no resistance at the waist. He can't believe he's doing this, he thinks, as he touches along his arms and shoulders, remembering all of the times he and Izuku have been intimate before this. Something about the way he drags his palm against his skin, like he's trying to hold all of him. It drives him up the fucking wall, especially when he smooths his thumb over his chest. Katsuki feels a little smug again when Izuku makes a shaking sound, giving him just enough time to dip his head and suck on the other. The sound he makes is its own reward.
"O-oh my god, Kacchan," Izuku's voice wavers as he rolls his hips against him. Katsuki hums and slides his free hand between them, pulling back his waistband to stroke his fingers along his length slowly, just how he knows feels good. "You're so- sensitive."
He snickers against his chest, kissing some skin before nipping sharply enough to draw a bit of a noise. "I'm not sensitive. Just because I don't need my foot in a bear trap to cum doesn't mean I'm sensitive."
"That's exactly what it means, actually." He teases and keens when he wraps his hand around him, squeezing his half-hard length as he sucks on his nipple. Katsuki knows this is what always feels the best, no matter what, and he chooses to ignore the argument Izuku is trying to make in favor of marking up his chest. He always thinks he looks best after they fuck.
The grip on his ass tightens as Izuku rocks into his hand, and Katsuki can literally feel the moment Izuku gets an idea- one he's excited about, if the sudden pulse in his hand has anything to say about it. A hand threads in his hair to tilt his head to the side, leaving room for Izuku to kiss the skin roughly and sigh out a tiny question Katsuki immediately wants to say no to. "Can you lie on the bed?"
"…What are you thinking?" He asks after a moment of distraction. Izuku's too damn skilled at keeping him from staying focused. Katsuki's eyes are focused on the flicker of light the TV casts on the back of the room, and how their shadows look because of it. His heart skips several beats, and then a few more when Izuku lifts him up anyways to lie him on his stomach. Hands are slipping into the side of his pants, trying to shimmy them downwards, but Katsuki twists just enough to catch his wrist.
"Woah, woah, woah. You've already gotten me to agree to sex tonight. I am not going to bottom while I'm in your body." That might be the weirdest shit he's ever said. Even weirder is seeing his own face pulling Deku's patented puppy dog eyes as he strokes the skin of his thighs.
"Why not?" He asks innocently, moving with too smoothly. The fact that he's so comfortable during sex has always been something Katsuki's a little jealous of. Now is no different, especially now that it's his own cock being pressed against his ass. "It's a little weird, but let it happen, baby. You do this for me all the time."
"I think all the times I've told you to go fuck yourself have gone to your head." He says dryly, but his voice doesn't sound anywhere near as he would like for it to be. He's only ever experimented a few times like this with Izuku, and never actually bottomed during sex. Sure, he's considered it, but…
"Come on. I know what I'm doing, after all." Izuku teasingly comments with a kiss to the back of his shoulder. One of his hands drags along his cock to press flat to his stomach. "I won't make you, but I'd like to try it. Please, Kacchan?"
The ensuing silence says it all. When there isn't a no, Katsuki always means yes, and they both have come to known this over the years. Izuku's smile is silent and yet Katsuki feels as though he can fucking hear it while he goes back to tugging his pants from his hips, straddling still. Katsuki sighs and tries to focus on the music from the movie instead of his goddamn nerves.
His boxers come off and Katsuki can literally imagine what Izuku is seeing. He's stripped him down often enough to be able to envision him from every angle, especially the one where his cock is pressed against the curve of his ass. He reaches to tug a pillow towards him. He gets the feeling he might need it. One burned pillow is not a big deal.
What surprises him, however, is when Izuku pulls away. The hands propping himself up on either side of him make their way downwards as Izuku's weight leaves the bed. Katsuki is wondered what the hell he's doing before he sees his shadow on the wall drop to his knees and feels his hands on his ass again. He feels warm from the tips of his ears to the tips of his toes now, every ounce of him pure mortification as fingers knead his skin.
"Relax, Kacchan." Izuku whispers as he presses the pad of his thumb against his hole, a light, teasing touch that makes his stomach do somersaults up into his throat. He presses a kiss to the crease between the back of his thigh and his ass. "I've got you, okay baby?"
Katsuki nods into his pillow. He understands how fucking weird it must have been for Izuku to agree to this the first time- but he guesses he should be a little encouraged by the fact that it feels good enough for him to want to demonstrate. "Whatever. Just get it over with."
"I'm gonna take my time." He sounds so sure of himself. That, if nothing else, is possibly the biggest turn on. Katsuki focuses on his hands, the quiet sound of his own breathing, and softness of the bed as he feels a wet tongue swipe over his entrance smoothly. Katsuki tenses immediately, hips shifting a bit, but Izuku just retaliates by slipping an arm beneath his leg and using it to hold his hips. His other hand strokes the inside of his thigh, a soft hum leaving him as he continues lapping at him. It's wet and strange, and Katsuki isn't sure if it feels good before Izuku laves his tongue towards his balls, sucking gently and trailing back up to press against him with it rolled into a point. The pressure alone makes his hips jump a little bit.
He can feel himself begin to relax- which, thankfully, Izuku's body seems used to doing- and every bit of his tongue slipping inside of him. The fabric under his hand strains as he tries to adjust himself to such a weird sensation as Izuku licking at his rim, sliding his tongue in and out of him and all the while making little sounds like he's enjoying this too. He stifles a groan before it can escape him, but it makes it way out as soon as Izuku's hand slides between him and the sheets to give him something better to rut against.
He can feel himself beginning to leak into the other's hand. Fuck, even being hard is a little bit different between them- it doesn't ache the same, and it doesn't feel quite right as he rocks forward into his hand and back onto his tongue. Izuku is getting bolder as he fucks him with his mouth more intently, his hand slipping up to hook a finger into his hole and give a gentle almost pull. It's a sensation he's only felt a few times in his life, but his body feels tight, wound up like a coil as he oh so gently rubs.
When he pulls away, he knows it's for lube. It's unaddressed; it doesn't move from its position in the nightstand specifically for occasions like this. He hears him pop the cap and wonders if it's muscle memory when he lifts his ass a bit, on full display and essentially begging for him to continue quickly.
And continue he does. His fingers are pressing against him again, sliding in with little resistance and stroking at his walls. Katsuki shudders as he feels himself fluttering around them, still rocking his hips slightly because even if he isn't so sure about this, it's pretty clear that his body is more than excited to be fucked. Were he any less desperate he would loathe his body for betraying him like this, but he's far passed the point of embarrassment.
"Kacchan?" His voice is soft, as if he weren't literally eating his ass less than a few minutes ago. He presses a kiss to the small of his back and smooths his cleaner hand along his spine, caring fingers pressing into where it's particularly tense. "Are you ready?"
"Yeah," He squeezes out and hates that his voice sounds so damn unsteady. It feels good, so far. He wishes he weren't so goddamn nervous about everything. "Put it in."
He digs his nails into the pillow, burying his face as he tells himself to take deep breaths as Izuku lines himself up. Katsuki shivers at the heat of his cock. He squeezes his ass as he presses his hips forward, sliding the head in, and… He. Doesn't hate it, actually.
It's not good. It's weird, a bit of a semi pleasant burn, but not good. It's not bad either, he thinks at first. But inch by inch more slides in, and he's beginning to see why he had to slow down so much the first time.
Izuku pauses and adjusts himself to be over his back. His hand slides from his shoulder to rest on the inside of his arm. He gives a comforting squeeze and sighs out shakily into his ear, and somehow the fact that he knows what he's feeling right now makes him breathe just as unsteadily. "Fuck, Kacchan… God."
He doesn't want him to stop there. He's only halfway in, and he already feels so fucking full, but Izuku has stopped moving. He's actually being too damn considerate for once- but he isn't about to ask for more. Not yet. No, he lifts his hips off the bed, pressing back against him until he feels his hips against his ass and they both stay completely still as they try to steady their breath. Izuku's forehead presses into the space between his shoulder blades as Katsuki cradles that pillow like it's his goddamn lifeline. This is a different kind of closeness, and the vulnerability takes him off guard.
His hip is going to be bruised. He knows it, he's new to this body and this feeling but the dull ache in his skin and the pressure in his stomach is familiar. Izuku's hand finds his as he sighs out in something akin to relief, lips moving against his skin as he speaks. "A-are you okay?"
"Fine," He breathes. He twines their fingers and rests his forehead against their conjoined hands, shifting slightly forward to test out the new feeling. "Start moving already."
He doesn't need to be told twice. He pulls out slowly and Katsuki thinks that he might lose it. It feels like a fucking delicious torture, pausing when he's halfway out and pushing back in more smoothly- fuck, it's pure electricity up his spine, his breath being taken away more with every thrust as he falls into a rhythm.
He's barely holding himself back from making noise. The last thing they need is a complaint. Katsuki doesn't want everyone to know he's being fucked- in Deku's body- taking his own cock with not even a fight between the two of them. He grits his teeth together but a hand slipping to his stomach to wrap around his length takes him by surprise. Lips press against the back of his neck and he feels like he's melting.
"Katsuki… Don't be quiet." Katsuki whines before covering his own mouth. He can't believe that's his voice. Izuku's fingers wrap around his wrist as he pulls it from his face, pressing both of his hands down against the bed. He gasps as he fucks into him a little harder, looking over his shoulder at him with wide eyes. Amusement shines bright in the other's expression. "What is it you said our first time? "I want to hear my Deku?"
"Shut the fuck up," He grunts back just in time not to react at a particularly good thrust. He bites his lip as he rolls his hips backwards like he's seen and felt Izuku do countless times, closing his eyes for a moment because his heart is in his throat and fuck, holy shit, this was good. "Still your goddamn-," He gasps loudly when hands pull him perfectly, his own cock hitting his prostate dead on and forcing the last word into a pathetic whimper. "Kacchan!"
Izuku moans too loudly. Katsuki's mind can't even keep up with it. He only realises how fucking absurd it is when he feels two fingers hook into his mouth, pressing against the softness of his tongue. Izuku's- his- voice rumbles roughly in his ear, a simple command punctuated by a perfect thrust of hips. "Say it again."
"K-ka, shit," He cusses and thinks he might just say fucking anything as long as he gets to suck on those nitroglycerin-sweet fingers. He laps at the space between them, lapping up the sweat and sweetness from their entire encounter so far. It's surprising there hasn't been any accidents just yet. "Kacchan! Fuck!"
"Shit, Deku," Deku himself grunts behind him, speeding up and adding sloppy kisses to his neck while he fingerfucks his mouth. It's off putting somewhere in the back of his mind but that isn't important right now, what's important is how small he feels underneath him like this, how his body reacts without his permission, the way Izuku presses his shoulder down and slams into him hard enough to rock the bed against the wall. "Like you were fuckin' made for this. Made for taking my fucking cock-,"
He doesn't even get the chance to acknowledge how new that is. The words, his voice, the feeling of his fingers down his throat and his cock deep inside him, it's more than enough to make that last thread of tension in his stomach snap. Izuku's hand quickly slides out to slap against his mouth as he almost lets out a moan that would definitely give them away to more than just Eijirou, his cum spreading across the sheets in white ropes as he tears into his mattress. Energy crackles around his hands and he can't decide if he wants to get away or press closer to Izuku.
The choice isn't his. Izuku fucks into him selfishly, chasing after his own pleasure as Katsuki ripples around him and he feels spurts of sticky cum shoot inside of himself, warm and low in his stomach while Izuku practically holds him in an almost headlock with the hand on his mouth. Katsuki's mind feels absolutely empty, thoughts blank and null as he gasps for air around his hand and lets himself go limp against the sheets.
The two of them lie panting together. Izuku's against his back, weight somehow comforting as he rasps into his shoulder. He withdraws his hand from over his mouth in favor of stroking his side, gently pulling his thumb across his hipbone, not pulling out just yet.
"Izuku," Katsuki whispers, voice fucking wrecked and wobbly.
"Yes, baby?" Izuku sounds tender as he always does, hand tracing down to his thigh to squeeze and massage, just to touch him.
"We're gonna have a fuckin' talk about what that was."
His eyes are closed, but he can see the embarrassed, frantic expression Deku would be making with his own face when he says, "O-okay, Kacchan."