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Observational Skills

Summary:

At a Class A get-together, a game is accidentally started where Shinsou guesses the preferences of his former classmates. Things take an interesting turn when he gets to Bakugou.

Notes:

(Originally written for Kinktober 2025 Day 18 - Size Kink)

I recently finished MHA and have been in the mood to write about it lots, especially timeskip content. I discovered Shinbaku because I am a simple Shinsou simp who went looking for fanfiction of him with anyone, and stumbled into the wonderful world of Shinbaku fics and now I'm hooked.

Anyway! I know there is a small but dedicated fanbase for this ship so please enjoy :)

(See the end of the work for more notes.)

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In the years following their graduation, the old A class group made it a point to meet regularly to catch up. With all of them being pro heroes now it hasn’t been easy to do it as often as they used to, but someone - usually Yaoyorozu - still makes a point every few months to extend an invitation to anyone who is available to meet up.

Yaoyorozu’s house is the biggest, of course, and they all spread out across her living room - some lying on the couches, some on the ground, some in each other’s laps (cough, Yaoyorozu and Jirou, cough). Almost everyone is here which is practically a miracle with their schedules, and they’ve gone through more than a few cases of beer.

Shinsou takes position on the floor with his back to the couch, head lolling back onto Uraraka’s lap and with Kaminari half-laid across his legs. He’s had just the right amount of alcohol to feel comfortable enough to seek touch in front of others, without being so drunk he’s crawling into someone’s arms. 

He’s half-listening to Kaminari and Sero argue about who was the most crush-worthy pro-hero when they were younger - with Sero arguing for Mirko and Kaminari, surprisingly, arguing for Hawks. 

“I’ve got to second you on Hawks,” Uraraka pipes up. Shinsou is unable to extract himself from the conversation due to his position trapped between Uraraka and Kaminari, even as he knows what’s coming.

“We all know who Shinsou is voting for,” Sero teases, earning him resounding laughter from the others within hearing range.

Guys,” he groans. His teenage infatuation with their old teacher has been kicked around the rumour mill and beaten more than any dead horse could possibly deserve. 

“Is that what you’re into? Older men?” Kaminari asks, turning over to face him with a smirk. “You should know, I’m two days older than you.”

He can’t help laughing at that, swatting at Kaminari’s head without any real force. “You know, you guys are always clowning on me for that, but I know you’re all into some weird shit too.”

It’s practically an admission, but thankfully they take the bait 

Sero laughs again. “Is that so? Like what?”

Without missing a beat, Shinsou points at him. “Voyeurism.”

Sero suddenly stops laughing, his eyes widening in shock at the - seemingly accurate - read. At the sudden change in his expression, the attention of the rest of their scattered group is drawn. The room is quiet for a moment before it’s broken by an eruption of tipsy laughter. 

“Oh my god, he called it!” Ashido cackles. “Wow, sucks to be so obvious, huh?”

Shinsou turns towards Ashido, raising an eyebrow. “... And you have a thing for heteromorphs.”

Her laughter cuts off, jaw dropping. It’s then that everyone really loses their minds.

“What the fuck? How?” Jirou asks, almost crying with laughter.

“This is too good, seriously!” Kaminari giggles.

“Do Iida next!”

After that, their little game of Shinsou-guessing-everyone’s-kinks begins. He’s guessing frighteningly accurately, which shouldn’t be much of a surprise considering his study of psychology and general apt observation - but this is just ridiculous. He quickly nails Iida’s submissive top preference, Todoroki’s shibari, and Midoriya’s masochism - though that last one doesn’t really surprise anyone, before someone yells to do Uraraka.

“Are you okay with that?” he checks. Something he notably didn’t ask the guys or Ashido, but that’s probably because he already knew none of them really cared. Uraraka just nods enthusiastically, to which he narrows his eyes and slowly mumbles, “... Control top. Probably a mommy or mistress kink.”

Her jaw drops, along with everyone else's. 

“Okay, there goes the streak,” Bakugou rolls his eyes. “Seriously, there’s no way.”

“I-I… I mean, sort of…” Uraraka half-admits, glancing around at everyone’s shocked expressions.

“Sort of?” Shinsou smirks, turning his head over to hook his chin on her knee and look up at her. “...Please, correct me if I’m mistaken, ma’am.”

Uraraka’s eyes darken and her mouth falls open with obvious desire, and Hagakure - who is sitting next to her - lets out a shriek, “Oh my god, he’s so right!”

“How on earth did you suspect that one?” Yaoyorozu asks. “I mean, some like Midoriya are obvious-”

“Hey!”

“-but I never would have guessed this!”

“A lot of people are what you’d expect,” he nods towards Yaoyorozu, “Like you like toys, right? Using them on others?”

Not even surprised anymore, she nods. He quickly looks around the room, pointing out a few in rapid succession. “Hagakure is another voyeur, Kirishima is a service top, and Tokoyami… you’re ace, aren’t you?”

He nods - they all do - and Shinsou turns back to Yaoyorozu. “Most people are obvious, I don’t think you need to know psychology to unpack all of that. No offense, guys.”

“None taken?” Kirishima says, though it sounds more like a question.

“But some people are totally different in bed, and you can usually identify it as something they don’t get in real life. Like how some really high-flying lawyers and politicians have been known to hire a dominatrix - they want to let go of the pressure of everyday life,” he nods to Uraraka. “Uraraka-san deals with a lot of people thinking she’s passive because she’s kind and gentle, but what she really gets off on is getting dominant over people… Especially people bigger than her, right?”

He asks the last part like it’s a question, looking up at her through his lashes once again, but she’s too busy staring slack-jawed to even answer. The room is quiet, clearly very impressed with all that goes into Shinsou’s deductions - as quick as they are. 

“You gotta calm down with that, Shinsou,” Kaminari breaks the silence. “She’s gonna get Yaomomo’s couch wet.”

“Okay, pillow princess,” Shinsou fires back, and everyone laughs once again, also breaking the tension with Uraraka.

“Is that another obvious one?” she chuckles, shaking off her previous hot-and-bothered expression - though Shinsou will recall that one for later.

“That one isn’t a guess,” he winks at Kaminari, who blushes and turns back to face the ceiling. 

“Wait, okay, who’s left?” Ashido interjects. Asui, Koda, Mineta and Shoji are the only ones who couldn’t make it tonight - which leaves Ojiro, Jirou and Bakugou. 

“Hm… Ojiro, you’re kind of vanilla, right?”

The tailed man chuckles and nods. “Sorry to disappoint.”

“Nothing wrong with it,” he grins, turning to Jirou. “Oral fixation? You like giving head, and hearing your partner. You also like anything that Yaoyorozu does.”

She laughs. “Who wouldn’t?”

“K-Kyouka!” Yaoyorozu blushes. 

Shinsou finally turns to look at Bakugou, who is staring back at him intently. There’s a reason he saved Bakugou for last, and it’s because he hasn’t decided whether he wants to tell the truth about his read on Bakugou. The guy might kill him. 

The funniest thing is, Bakugou’s preferences are what Shinsou is the most certain about. His reaction to Uraraka confirmed it for him - he wanted everyone to stay thinking on the surface level.

“Bakugou is probably a sadist, right?” Kaminari asks. 

Bakugou doesn’t say anything, he just keeps staring at Shinsou, his eyes daring him to try.

Shinsou smirks, “Nah. There’s no way this guy tops. Brattiest bottom I’ve ever seen in my life.”

The room grows quiet, all eyes turning to Bakugou for his reaction, but he’s still just glaring at Shinsou. He continues.

“You like being dominated, but they have to earn it,” Shinsou slowly leans forward off of Uraraka’s knees, maintaining eye contact with Bakugou. “Am I wrong?”

The silence bores on between them for another - increasingly awkward - minute, before he finally grumbles. “I’ll stop you if you’re wrong, how about that?”

It’s an admission, but nobody breaks out in laughter this time. Everyone is watching between the two of them, waiting to see what happens next.

“I think that above everything else…Shinsou places a thoughtful hand on his chin, watching for Bakugou’s reaction as he ponders one he’s less sure of. “You have a crazy size kink.”

The room waits in tense silence as Bakugou lets out a slow breath, shifting in his armchair. “Go on.”

It’s another admission, and an invitation for Shinsou to really analyse him. He hasn’t gone into this much detail for anyone else and isn’t sure why he’s doing so now - besides the fact that Bakugou seems to be clearly into it, or just unwilling to back down.

“It’s not just being with someone bigger than you, right? You specifically want a big cock that will completely overwhelm you.”

Someone near him sucks in a breath but he doesn’t pay attention to who it was, instead focusing on Bakugou’s dilating pupils and slightly-slacked jaw. He’s definitely getting turned on. He’s not the only one.

The tense silence is broken with a loud clap as Iida jumps up and slams his hands together, startling everyone in the room to attention. His own face is beet red. “I-I will make a run to the kitchen for more drinks. Drinks, anyone?”

A few people shout out drink orders and others get up to help Iida out, effectively loosening the tight knot that had formed in everyone’s chests as they watched Shinsou and Bakugou flirt.

Because… that’s what it was, right? What other way is there to interpret that? Bakugou could have just denied it - it’s not like Shinsou would have pushed the topic if the other man seemed at all uncomfortable with revealing it. But that wasn’t the case, if anything Bakugou was egging him on.

“Hey, Shinsou? Drink?” Midoriya asks.

“... I’ll just come with you,” he sighs, extracting himself from his comfortable position between Uraraka and Kaminari to follow Iida and Midoriya into the kitchen. He’s grateful for the temporary escape from the now curious eyes amongst his former classmates.

Shinsou wasn’t the shut-in he used to be, not by the end of their third year and certainly not now, but it’s not like he would usually go around and spread information about his sex life. Sober Shinsou will probably regret how much he’s inadvertently given up to their classmates by flirting with Bakugou in front of them - and Uraraka, for that matter.

But… damn if he isn’t still curious now.

His thoughts are interrupted by Midoriya nudging him once Iida goes to dig around in the fridge. His eyes are practically sparkling as he whispers, “You should go for it.”

“What?” 

“With Kacchan.”

Shinsou slowly blinks, eyes darting over to Iida - who is clearly attempting to eavesdrop while he pretends to still be looking for drinks. “I… I mean, it’s not that I’m not interested. Obviously. But it’s also…”

Not your business? He can hardly say that when he spent the last twenty minutes making it everyone’s business. 

“You know, I’ve told him to text you before,” Midoriya admits, smiling mischievously. Which makes sense - if Bakugou was going to actually tell anyone about his preferences, it would have been Midoriya. 

And every boy who has shared a locker room with Shinsou knows what he’s packing. 

“Well, he hasn’t.” Shinsou says, crossing his arms. “He’s Dynamight, I’m sure he’s not lacking people wanting to jump into bed with him.”

“He’s not lacking for people who want to be fucked by him,” Midoriya says, eyes getting a little intense for Shinsou’s liking. “But as far as I know - and Shinsou, that’s pretty far - his bottoming experience is limited to his dildo and one ill-advised night with Kirishima back at UA.”

“Oh my god.” Shinsou mumbles. “Should you be telling me all this?”

“He’ll forgive me,” Midoriya waves him off. It’s true, of course, but it still may get him a few explosions to the face first. “Here, you go out there and give him a beer and then sit near him. Then, uh… do your dominance thing.”

“My dominance thing?” he practically wheezes. 

“Like before!” he snaps his fingers. “Oh, I’ll have Kaminari bring it up in conversation. Your dick.”

“I don’t think that’s necessary!” Shinsou hisses, glancing out towards the living room to ensure none of the others were listening in. For as much as he didn’t care about everyone knowing earlier, Midoriya has a way of making things really embarrassing. 

Also, he’s a little too invested in getting Bakugou laid, it’s a little unsettling. But then again, he’s always been really weird about Bakugou so Shinsou tries to let that part go.

Instead, he takes two drinks from Iida’s arms - he gave up on pretending not to listen a while ago and is just watching - and sighs. “Listen, I’m interested so I’ll try but don’t… Don’t do anything, okay?”

“Fine,” Midoriya pouts.

“And if he doesn’t go for it, leave it alone,” he narrows his eyes. 

He and Midoriya have a stare-off for a moment before he sighs in defeat. “Fine.”

Shinsou lets out a world-weary sigh and turns to walk back out into the living room. The conversation has moved on to some other topic and the tension in the room when they left has long since dissipated, though not for Shinsou who feels like he’s being sent on some kind of mission. He wonders if he’ll even be able to hook up with Bakugou now without picturing Midoriya watching them and taking notes.

Bakugou is in the same loveseat as earlier, which doesn’t help the whole ‘sit next to him’ plan. Nonetheless he makes his way over to where Bakugou is chatting with Kirishima and Ashido and proffers him the drink. He glances up, and Shinsou swears he sees him freeze for a second before reaching out to take it with a nod.

“No ‘thank you’?” Shinsou smirks. Bakugou scowls. 

“It’s not that fuckin’ hard to grab a beer from ten feet away.”

“Yet you didn’t get it yourself,” Shinsou continues, trying as casually as possible to slide in to perch on the armrest of the loveseat like he’s joining the conversation with Kirishima and Ashido - though they’re just watching with uncontained interest. “I’m not asking much.”

Bakugou just looks up at him for a moment, expression inscrutable. Shinsou’s words don’t carry any particular meaning, but he is adding a certain inflection to his tone that his more submissive partners seem to respond well to. It’s the tone he uses when commanding his quirk, though he isn’t right now.

In any other case Bakugou would probably shove Shinsou off the couch, but it seems he hasn’t forgotten what just happened earlier either.

So he just glances away, the barest hint of pink on his ears. “... Fine. Thanks or whatever.”

It’s not a lot but for Bakugou, it’s huge. Kirishima is staring between them in shock, but Ashido manages to get a hold of herself. She laughs and pipes up to continue the conversation. 

“Well, what I was saying is that Phantom Thief is in the Top Ten now!”

“You have to admit he’s good,” Shinsou replies when the other two don’t, turning away from Bakugou. “And entertaining, too.”

“I know, it’s just…”

The conversation moves on from there, mundane enough that Shinsou can keep up without really paying much attention. He glances down at Bakugou a few times, each time he’s staring resolutely ahead as if the hundredth conversation they’ve all had about the rankings is the most important thing on his mind right now, despite him not contributing anything.

He waits, just existing in Bakugou’s space until an opportunity arises for more. It comes a few minutes later when a tipsy Kaminari tumbles over Yaoyorozu’s coffee table and draws the attention of everyone in the room - either laughing or concerned, mostly the former. 

While Kirishima and Mina aren’t looking, he turns to Bakugou again only to see him already glaring up at Shinsou.

“Are you going to fuck me or what?”

Shinsou blinks his surprise away quickly, expression morphing into a self-satisfied smirk. “Didn’t think you’d be that easy.”

“What?” he scoffs. “You’ve been eyeing me since that stupid guessing game earlier.”

“And that’s all it takes?”

“It won’t be if you keep pissing me off.”

“I’m not complaining. I just think my initial diagnosis of bratty bottom should probably be reassessed.”

Bakugou glances over to see if anyone is listening, but everyone seems to be focused on Midoriya, who is seemingly keeping everyone distracted with a story  about some of the kids at school getting caught in the showers. He turns back to Shinsou, reaching up to grab him by the collar and roughly pull him down so their faces are less than an inch apart.

“I’ve wanted that monster in your pants since high school, so I’m a little fucking impatient right now. Say no if you don’t want it, asshole.”

Shinsou blinks - once, twice - but doesn’t say anything. How could he? He does want it.

Bakugou smirks, releasing his hold on Shinsou’s shirt. “Good.”

He throws his head back and downs the rest of his beer in three gulps before slamming it down on the side table. The noise causes Midoriya to stutter and a few people look over, but Bakugou pays them no mind. He grabs Shinsou by the wrist and makes a beeline for the door.

They don’t escape without Kaminari letting out a loud wolf-whistle, and Shinsou doesn’t miss the tips of Bakugou’s ears flushing red at the attention - despite the fact that he’s the one who failed to make a stealthy exit. “Damn, he works quick! Have fun Bakugou, he knows how to use that extra leg!”

Bakugou throws Kaminari the finger over his shoulder, not attempting to deny anything as he drags a dutifully-following Shinsou out. Shinsou rolls his eyes, turning to wave a half-hearted farewell to the others. He winks at Midoriya - who looks elated - but everyone sees too.

Good. This is a goddamn achievement Shinsou’s highschool self never would have expected.

Neither of them drove due to the drinking plans, and Shinsou assumes Bakugou was planning to blast his way home. Thankfully he instead decides to call them both a taxi. Shinsou half-expects one of their friends to follow them out or at least try to peek, but he doesn’t catch anyone. 

The ride between Yaoyorozu’s house and Bakugou’s apartment is fairly short, but it feels like it stretches on as the silence between them grows awkward. Shinsou doesn’t think Bakugou wants him to fill the space with small talk, so he just waits until they reach Bakugou’s apartment building. He notices Bakugou throw more cash than necessary at the driver before he tugs Shinsou out of the taxi and in through the lobby.

As they’re passing the concierge and a few other residents who look on curiously, Shinsou breaks the silence. “... Is it okay for so many people to see you bringing me home?”

Bakugou shrugs as they enter the elevator, punching in the number for the twentieth floor. “I bring plenty of people home, it’s fine.”

So long as they’re not famous too, is left unspoken. Shinsou does think it a perk of being an underground hero that he doesn’t have to worry about any of that. 

They quickly reach Bakugou’s floor. He’d been to Bakugou’s place a few times since Midoriya always convinced him to throw a big birthday party with all his friends, but it’s usually decorated and full of bodies on nights like those. He’s unsurprised to see it perfectly clean on a random Friday night, the fireplace already burning and dim lights setting the mood the moment they walk in. He wonders if there’s a timer or something.

“Whoa,” Shinsou murmurs as he looks around, waiting for Bakugou to lock the door behind him. “...Your place is so nice when Kaminari and Ashido aren’t having a karaoke battle on your coffee table.”

Bakugou barks out a laugh. “Thanks. You want a drink or something?”

It’s tempting, but he shakes his head. Instead he takes the two steps to close the distance between them, placing confident hands on Bakugou’s hips. “... Nah.”

To his delight, Bakugou’s face flushes even more than it had earlier. Shinsou is grateful for the few inches he has on Bakugou in that moment, something about Great Explosion Murder God Dynamight looking up at him like an angry pomeranian satisfies him.

“Who would’ve known you’re so… easy,” he murmurs, bringing one hand up underneath Bakugou’s chin to tilt his head further back. “I never imagined you’d let me put my hands all over you like this.”

Bakugou grits his teeth, looking for all the world like he wants to snap Shinsou’s bones. Shinsou is pretty sure he’s fighting an internal battle right now - he wants to push back, but he also really, really wants to get fucked and doesn’t want to jeopardize that.  

Shinsou doesn’t really mind whether his partner prefers to be bratty or submissive, but he doesn’t want to make anyone uncomfortable or feel like they can’t be themselves. So he keeps probing.

“Are you even sure you can take it? Wouldn’t it be funny if you debased yourself to bring me here and I don’t even fuck you?”

Bakugou’s shoulders tense, his jaw gritting and hands sparking in an all too familiar way. “Asshole.”

Shinsou smirks. “Bakugou.”

His hands, which had previously been sitting by his sides, are suddenly fisting the front of Shinsou’s shirt. He can smell it burning. 

“I can take it.”

“You’re sure? I heard you’ve never taken the real thing.”

He scowls, mumbling none-too-quietly ‘fucking Deku…’ 

Then he pulls hard on Shinsou’s shirt, tugging him towards the bedroom with no grace or finesse whatsoever. Shinsou stumbles after him, not fighting back and letting himself get thrown towards the bed. He bounces when he lands, barely catching himself from tumbling backwards.

Bakugou stands in front of him, arms crossed and eyes burning with determination. “Take your clothes off.”

Shinsou glances down at his already charred shirt, a few buttons having popped off from all the manhandling. “... It seems I’m already halfway there.”

Good.”

Shinsou wants to keep teasing, but he also doesn’t want to anger Bakugou to the point that he doesn’t want to do this anymore, so he starts to unbutton the rest of his shirt.

He usually doesn’t find it particularly sexy to strip on his own - he’s not suave enough to really make a show of it - but the way Bakugou’s eyes shamelessly rake over each new inch of exposed skin really boosts his interest in the action. 

“Are you just going to stand there and watch me all night?” Shinsou asks as he shrugs his shirt off and tosses it to the side. “I’m starting to wonder if you really want to get fucked.”

“No, you’re not,” he grumbles, but takes the few steps towards the bed anyway. He settles a knee on the edge so they’re only inches apart. “You want me to fight back, right?”

Shinsou just shrugs. He doesn’t necessarily want him to, he just doesn’t want him to hold back whatever he does want.

Bakugou grunts, then suddenly sinks to his knees in front of Shinsou, settling both hands on his knees and shoving them apart roughly. Shinsou is half-hard in his jeans and startles when Bakugou places a rough hand on his cock, squeezing around the outline.

“Shit,” his eyes widen as his hand settles around the girth, looking up at Shinsou with fire in his eyes. “I’ve never seen it hard before.”

“Really?” Shinsou laughs. He had definitely experienced a few awkwardly timed erections as a teen.

“Well, not up close. Jesus, you’re thick…” he stares as he starts to stroke him through the fabric, the friction quickly drawing Shinsou to full hardness. He pauses when Shinsou’s bulge is straining the material, jaw slightly open as he stares. “... Did you always know?”

“What?” Shinsou shifts his hips forward, trying to encourage him to continue stroking it.

“About… What I liked. You knew what everyone was into.”

“I could have been wrong.”

“Well, you weren’t,” he squeezes Shinsou’s cock to demonstrate. “So? How long?”

Shinsou honestly hadn’t put that much thought towards Bakugou’s preferences before tonight. Sure, Bakugou is hot, but he mostly seemed uninterested since he was so focused on his career and had his whole queerplatonic-situationship-soulmate thing going on with Midoriya. But at the same time it’s not like he ever thought Bakugou might be a top.

“I don’t know,” he answers honestly. “I guess I’ve always just guessed so. You… seem to always be overcompensating.”

Huh?” he narrows his eyes. “I’m not ashamed, nothing wrong with taking a cock.”

“I agree.”

“I just don’t like people being in my business, so they’re always guessing. Wrong.”

“Except me?”

“Yeah, except you.”

“It is my job,” Shinsou grins. “But I really can  be wrong. Didn’t want to make the wrong move and get blown up.”

“Pussy.”

Seemingly not having any further questions, Bakugou finally unbuttons Shinsou’s jeans and starts to tug them down his legs along with his underwear. Shinsou lifts his hips to help him along, watching Bakugou’s face as his cock is finally released, bouncing back against his abdomen. He can’t help grinning when he sees Bakugou’s jaw drop.

“You’re pierced?” he asks, as if the proof isn’t right in front of his eyes. “Kaminari didn’t warn me about this.”

“He and I haven’t hooked up since he and Jirou went steady,” Shinsou chuckles, running a thumb along the studs lining the underside of his cock. “I got these about two or three years ago while undercover.”

“What kind of undercover job requires this shit?” he grumbles, tone not matching the legitimate sparkle in his eyes as he stares at the row of piercings.

“It’s not required. One of the thugs' girlfriends ran the shop, so it did help me gain their trust, but I wanted to get this done anyway.”

“A thug wanted his girlfriend to pierce your dick?”

“I don’t really question the minds of criminals. But I think he was into cucking.”

“You fucked her?”

Shinsou laughs and shakes his head. “Nah. We wrapped up the job before it healed.”

“Anyone else?” he finally reaches a hand up, wrapping it around the base and thumbing at the lowest piercing. “How does it feel?”

“No complaints,” Shinsou sighs, eyes fluttering shut as Bakugou’s warm hand curiously explores the ridges, “I can’t always… hah, top though.”

“Yeah, no shit,” Bakugou squeezes at the base, “But you can top me.”

“Still feeling confident about that?” 

Bakugou nods. “I use my toy. A lot.”

Shinsou leans forward, guiding Bakugou’s gaze up to his face. As much as he’s been enjoying egging Bakugou on, he does want to be sure. He’s accidentally hurt a few people in bed before and he doesn’t want to do it again.

“It’s different to a toy. I need you to tell me if it’s hurting… in a way you don’t like,” he tacks on the last part when he sees a familiar spark in Bakugou’s eye.

He groans. “Yeah. Obviously.”

Bakugou.”

“I mean it. I’ll tell you,” he grumbles, glancing away. The red of his cheeks darken as he mumbles, “And… Katsuki.”

Shinsou’s lips twitch. “... Okay then. Katsuki.”

He really blushes this time, avoiding Shinsou’s gaze and standing up from the floor to circle around the bed and out of sight. He digs around in his bedside drawer, producing a half-used bottle of lube and unopened box of condoms - both of which he tosses to Shinsou. If it weren’t for his hero training it would have hit him in the head, but thankfully he catches it.

“You had these already?” Shinsou asks, eyeing the XL label on the box of condoms.

“Wishful fuckin’ thinking,” Bakugou grumbles as he lays back on the bed. 

Shinsou chuckles. “If you were this desperate, why did you never give me a call?”

“Some bullshit Deku always says about not fucking my friends?” 

“Try again.”

He rolls his eyes. “You think I wanted to message you like a desperate whore and ask you to fuck me because I just want a massive cock that bad?”

Shinsou smirks, “I mean… It would have been an ego boost.”

“Shut up,” he groans. Shinsou laughs, putting the materials aside to instead crawl over Bakugou. He’s practically naked while Bakugou is still fully clothed, which he quickly begins to remedy by tugging Bakugou’s tank top off over his head.

It doesn’t take long for Shinsou to get Bakugou out of his clothes and on his back, a pillow under his hips for comfort. Despite all the talking, Bakugou is still hard when Shinsou finally opens the lube and actually touches him.

“B- Katsuki,” Shinsou says as he brings his lubricated fingers between Bakugou’s open legs.

“Yeah?”

“I’m going to take it slow, okay?”

He, predictably, throws his head back with a groan, but thankfully doesn’t argue about it. “Okay. Just do something already.”

Bakugou clearly wasn’t planning to go home with anyone tonight so he’s not prepared at all, something that becomes obvious as soon as Shinsou sinks one finger into his tight entrance. He doesn’t say that it hurts though and nods for Shinsou to continue, leading to the most torturously slow fifteen minutes of fingering he’s ever experienced.

He understands why Shinsou is insisting on taking his time, but this pace combined with his mouth on Bakugou’s cock to ‘relax’ him has him struggling to hold back. 

Shinsou,” he groans, rolling his hips down to no avail. “Fucking- I’m not made of glass, hurry up.”

“Hitoshi.”

“What?”

Shinsou smirks, tongue poking out to tease the head of Bakugou’s cock. “Call me by my name.”

Bakugou’s hips buck up and he lets out an involuntary - embarrassing - moan at both the sight of Shinsou’s dark eyes on him and the physical sensations that have had him teetering on the edge for a while now.

“Fuck, Hitoshi,” he gasps, “I-I’m ready. Come on, fuck me already.”

Shinsou shakes his head, “I want to do one more finger.”

“I can’t,” Bakugou whines - actually whines, that’ll be one for the journal - “I’m going to cum if you keep this up and if I don’t get your cock tonight I will start a fucking fire.”

Shinsou pauses his motions, looking up towards Bakugou’s face. He’s gotten his anger issues under control over the years but… something tells him that’s not a bluff. 

“Shit, fine. I’ll trust you to know your limits,” he says, pulling three fingers out and wiping them on the sheets. “But if it hurts too much, we can slow down and try again. Okay?”

“It won’t hurt too much!”

Shinsou doesn’t respond, instead reaching for the condoms he had put aside earlier and taking one out of the packet. He rolls it over himself, careful not to let any of the piercings break through. Bakugou watches with interest as he puts on the condom, covering it in a lot of lube.

“Seriously just unfair…” Bakugou sighs, lifting his hips in invitation. Shinsou leans over him, lining himself up.

“Can I kiss you?” he asks. Instead of saying yes Bakugou leans up the short distance to connect their lips, slinging his arms around Shinsou’s neck to drag him closer. Shinsou tries not to melt into the kiss too much - he really loves kissing, sue him - and instead uses the distraction to begin pushing in.

It hardly helps in the end. As the head finally breaches the rim, Bakugou’s mouth opens in a sharp gasp. Shinsou pulls away to gauge his expression - is he hurt? Does he need to stop? - but Bakugou just pulls him back down into a sloppier kiss, moaning against his mouth. 

Shinsou takes the positive response for what it is and sinks in further, slowly, inch by inch. All the while Bakugou continues to let out the most obscene little noises against his mouth until eventually he can’t focus on kissing anymore, head falling back to the mattress.

“Oh my god,” he moans, tears springing in his eyes. “Fuck, you’re insane. Those fucking piercings.”

“Thanks,” Shinsou mumbles, glancing down. “I’m about two-thirds in. We can stop here if you need.”

No. I can take it.”

Honestly, Shinsou believes him. Despite the tears he looks like he’s on cloud fucking nine right now and Shinsou honestly is only a few more desperate words away from fucking into him like a maniac. 

He takes a slow, deep breath, and presses his hips forward the last few inches. The last ridge of his piercing pops inside, leaving the last inch to be an easier slide. Then, just like that, he’s entirely seated inside of Katsuki Bakugou. 

Fuck!” Bakugou practically sobs, hands scrambling at Shinsou’s shoulders. “Oh my god. Is it in?”

“Yeah,” Shinsou breathes out slowly, also a bit overwhelmed by the intense heat swallowing him in. Considering how often Bakugou supposedly takes a monster dildo, he’s still achingly tight around him.

“H-Holy shit…” bleary eyes trail down to where they’re connected at the hips, stopping when he sees the protrusion in his belly. He throws his head back, “Oh, fuck-!”

Without warning, Bakugou suddenly clenches around him and cums completely untouched, writhing desperately against the mattress. 

It happens so fast that Shinsou has no time to react, to stop it or to help him along or even comprehend it. He groans at the sudden vice grip on his cock, hands digging bruises into Bakugou’s hips. He watches Bakugou come down from his high, jaw hanging open in shock. 

“Oh my… fuck…” Bakugou wheezes as he settles back into reality, opening his eyes to first look at the mess he’s made on his stomach, then up towards Shinsou’s shocked - and incredibly, desperately horny - gaze. 

“That was…” Shinsou murmurs, clearing his throat when his voice comes out far deeper than he intended. “I, uh… That’s never happened before.”

“Told you…” he grins. “Told you I could fuckin’ take it.”

Shinsou laughs, leaning down to kiss him again. Bakugou accepts it, melting back into the mattress without any fight left in him now that he’s impaled on Shinsou’s cock and satisfied. Shinsou kisses him lazily for a while until they’re both relaxed, then moves to pull out.

Bakugou locks his ankles around Shinsou’s back, keeping him in place. “The fuck you think you’re doing?”

“You just came,” Shinsou says.

“I told you I wanted you to fuck me tonight,” he rolls his hips down, “Come on, show me what you got.”

Shinsou stares in bewilderment. “... You just came.”

“Can’t you tell by now I know what I want?” he pulls Shinsou down by the shoulders again. “Come on, Hitoshi. Fuck me like you really want to.”

And by god, Shinsou wants to. 

He pulls back halfway before thrusting back in, hard, drawing a delicious gasp from the man below him. He must be so fucking sensitive, but here he is begging for Shinsou to fuck him properly. 

He speeds up, keeping his cock almost all the way in and fucking him deep, revelling in the increasingly needy sounds spilling from Bakugou’s lips uninhibited. 

“Shit, Katsuki,” he moans, hands squeezing Bakugou’s waist appreciatively. Fuck, it’s not often that he gets to actually top someone properly and after Bakugou’s last orgasm, he doesn’t think he’s going to last long. 

It seems he doesn’t need to worry though. Bakugou, who is past the point of formulating actual words, pulls Shinsou back into another kiss that is more of a whine against his lips as he cums for the second time, the warmth squirting between their stomachs and his ass tightening around Shinsou again.

Shinsou moans into Bakugou’s mouth, hips thrusting hard and deep to work Bakugou through his orgasm, the tightness and the knowledge that he just made Bakugou cum twice more than enough to send him over the edge. His slams all the way in, staying there as he cums inside of him. He hears Bakugou whimper as he comes down from his own orgasm, oversensitivity surely effecting him now.

They both take a few minutes to breathe, the heat between them slowly settling down. This time Bakugou lets Shinsou pull out, which he does slowly and carefully. 

“Are you okay?” he asks, pulling off and tying the condom.

“Yeah. Damn,” he nods slowly, a lazy grin stretching across his face. “Fuck… I’m ready for fucking bed, though.”

Shinsou laughs. “Yeah, me too.”

After Shinsou has cleaned them both up he crawls into bed with Bakugou. He doesn’t know whether Bakugou wants him to stay over, but it’s late and he’s tired and he doubts he’d get that mad about it. 

To his mild surprise, Bakugou lets him in and actually moves up to press himself into Shinsou’s side. It’s nice - Shinsou loves cuddles after sex, but he wasn’t sure if Bakugou would want to. He accepts the wordless offer and loops his arms around Bakugou, holding him against his side and bringing a hand up to card through spiky hair.

They’re quiet for a while and Shinsou almost falls asleep, but after a few minutes of comfortable silence Bakugou mumbles something against his chest.

“... It was the friends thing.”

“Hm?” Shinsou blinks awake his sleepy eyes to look down at Bakugou’s head. “What?”

“The reason I’ve never called you for sex. I wasn’t just embarrassed.”

He pauses.

“Well, I was embarrassed, but I also don’t like fucking my friends,” he continues. “Things were really awkward with Kirishima after we hooked up. I’m… not the type who can do casual.”

Shinsou nods slowly, unsure where to begin with all that. Is he implying that he wants this to be more than casual? Where did that even come from? 

Oh. Oh. Shit.

If there’s one thing that’s a gap in Shinsou’s observational abilities, it’s when someone likes him.

Bakugou sighs. “It’s no pressure or whatever. I just don’t want you to think I was that desperate for cock that I broke my own rule. I mean I did, but… Maybe, like… I don’t know, maybe this is a friendship I want to ruin?”

He looks up at Shinsou, who is probably frowning in confusion. He curses, “Not like that. I just-”

“I mean,” Shinsou smiles. “It’s fine, I get it… We weren’t that close, anyway.”

Bakugou barks out a laugh, his worried brow settling. It seems he understood Shinsou’s implication. 

But it’s too late at night to hash out any more details than that, so Shinsou just pulls Bakugou back into his side and places a tentative kiss on his messy hair. Bakugou accepts it, and slowly his breathing evens out into a steady rhythm as he dozes off. 

Shinsou follows soon after, grateful for a rare good night’s sleep. And of course, far more grateful for the potential of whatever this might be.

He’ll have to thank Midoriya later.

Notes:

I didn't mean for the Uraraka scene to go that far tbh, I was definitely projecting on her but now I'm kind of into it and I might write more of that pairing later... who knows :)

Also I hit the tag limit on my other main series for KT so I'm now posting it separately... deciding whether to do the same for the other chapters or not but I'm mourning losing the original comments if I do.

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