that wicked smile

bnha, aged-up bakusero
friends with benefits
blow jobs, anal sex
minimal prep, spit as lube
sex in public, sex in a bathroom

nsfw, minors do not interact

summary: unbeknownst to their friend group, bakugou and sero are friends with benefits. things are pretty casual between them, but baku gets riled up when sero *smiles* at him too much over dinner

here we go! qrt to comment please if you feel inclined :)

On most Friday nights, Bakugou gets dragged to a restaurant or a bar by his so-called friends. The group likes to blow off steam after a long week at their agencies.

Basically, they eat a fuck-ton, get shit-faced, then go back to Kaminari and Kirishima’s place where everyone falls asleep playing video games or screaming about some shitty shoujo anime they’ve put on the television.

Everyone except for Bakugou and Sero.

When their friends fall asleep, they go back to Bakugou’s place and fuck.

Bakugou can’t really pinpoint the exact time or notion that led to this happening in the first place, but fuck it if he hadn’t been enjoying the situation just a tiny bit. No one else really knows about it, and Bakugou doesn’t really think it was anybody’s business anyways.

Along with the fact that Sero is just too damn casual about everything for his own good, it makes for a pretty perfect situation where Bakugou can get dick without catching feelings. He doesn’t have time for any of that crap anyways.

But there’s just one thing that Bakugou isn’t so crazy about.

This thing presents itself on another Friday night with the squad. They’re all squeezed in a booth at a smoky yakiniku joint, sitting hip to hip on a small, rounded bench really made for four people.

Somehow, Bakugou got trapped in the middle, and it’s freaking hot, the smoke from their grill not helping at all. On his left, Pikachu is loudly telling the tale of rescuing a cat from a tree on campus while atop Shitty Hair’s shoulders.

On his right, Pinky is flipping shit on the grill. And on Pinky’s right is Sero, an arm thrown over the back of the booth as he listens to Kaminari’s story.

He and Bakugou have seen each other naked at least a dozen times now. Nothing has changed as far as Bakugou can tell, but, tonight, every so often, Sero will catch Bakugou’s eyes through the haze of barbeque smoke and give him this /smile/.

It’s this big, stupid grin. All teeth and easy-breezy confidence. Like he’s got this juicy secret, and he ain’t sharing any time soon, but it’s a good one, so good you’ll do anything to make him spill.

It makes Bakugou’s stomach churn with nerves because he’s not sure what the hell Tape Face is so fucking smug about in the first place.

Is there something on his face? Is the bastard looking down on him?

Whatever the reason, the best Bakugou can do to retaliate is gulp down his questions and jab his middle finger in the air each time Sero flashes those pearly whites at him.

Nobody finds the gesture odd, so things go on as usual.

But after the fifth smile/flip-off combo, Bakugou has had enough and has also drunk enough water to need a bathroom break. Sero and Pinky move out of his way so he can leave, sticky thighs squeaking over the plastic covering as they slide out.

“You’re welcome!” Mina says, bleh-ing her tongue out at Bakugou, who waves her off without glancing back.

He absently hears Sero say something about needing a smoke break outside but doesn’t think much of it as he makes his way through the noisy restaurant, the sounds of chittering patrons and clattering chopsticks in his ears.

As he gets into the quiet, dark hallway for the bathroom, Bakugou is mildly aware of footsteps behind him.

They’re kind of slow and steady like someone he knows, and when Bakugou feels a puff of hot breath on the back of his neck and gets a whiff of Old Spice and the faint reek of cigarette smoke, he realizes that Sero did not go out for a smoke break at all.

This makes Bakugou huff. Stupidly tall, grinning, tape person. What the hell does he want?

Instead of acknowledging Sero, Bakugou forges ahead, pushes the bathroom door open, and lets it swing closed immediately behind him.

He hears a thud on the door, as Sero probably had to throw out a hand to keep the door from smacking him in the face. The thought makes Bakugou smirk as he chooses a urinal and unzips himself.

He hears more footsteps echoing from the tiled floor of the small bathroom as he pisses what feels like ten glasses of water (he was fucking boiling where he’d been sitting) –

then there’s a silence, in which Bakugou can only hear the sound of his own piss and the buzzing of fluorescent lights above.

“Did I do something, Blasty?”

Sero’s voice cuts through the ambient noise of the bathroom, and Bakugou feels himself bristle at the question.

Is that what this is all about? The fuck?

Bakugou zips himself back up and turns around (in the direction away from Sero’s voice) to wash his hands. He says nothing as he approaches the counter and pushes the faucet on with an elbow, the too-sweet smell of cheap soap filling his nose as he pumps the dispenser.

There’s something in Bakugou that absolutely does not want to give Sero the satisfaction of any sort of answer, though Bakugou is fully aware that Sero intends to make him talk somehow.

Still, he isn’t gonna make it easy. He rubs his hands together under the clear stream of water from the faucet, the soap in his hands frothing and falling away into the white basin.

“Not gonna answer?”

Bakugou can hear the grin in Sero’s voice as he talks. It’s taunting him, like there’s a joke that he doesn’t get, and he hates it.

More footsteps, then Bakugou feels Sero pressed up against his back, sees long-fingered hands and lanky arms cage him in against the wet countertop. For someone so skinny, Bakugou is always surprised by how much heat the guy bleeds.

He turns his head slightly without really meeting Sero’s gaze when his hands are clean and the faucet stops running automatically.

“Move,” Bakugou says.

“Oh, it speaks,” Sero chuckles.

A growl rumbles in Bakugou’s throat. He doesn’t really understand what the hell Sero is doing, and the fact that he sees that Sero is grinning his ass off in their mirrored reflection is making him want to slam a palm on his stupid face and activate his quirk.

“So what is it?” Sero says. “You kept flipping me the bird out there and I wanna know why.”

Bakugou expels a frustrated breath from his nose and rolls his eyes. “Because your face is dumb, that’s why. Move.”

“Is that really it?”

Bakugou wants to say that it absolutely is (it’s pretty much the truth), but he can’t. Not while Sero is so close to him like this, hot breath fanning over the nape of his neck and dark eyes staring at him through the mirror.

They’ve been closer than this before, Sero’s been inside him more than a dozen times now for fuck’s sake, but something about this position makes Bakugou feels trapped in more ways than one.

It's making his mind feel all foggy.

He balls his wet hands into fists and digs his nails into his palms to wake himself up. It only works a little bit.

“Move now, soy sauce face,” Bakugou says, his palms starting to steam as his quirk activates of its own volition.

“Or?”

“Or I’ll blast your ass off.”

Sero’s eyes flick to Bakugou’s smoking hands, and he relents, backing off with his palms up in the air as a sign of surrender.

“Alright, alright. No need to get upset.”

“I’m not –”

“I know,” Sero says, with another cheeky grin. “Whatever you say, Blasty.”

Bakugou shoots him one last glare, wishing he could vaporize Sero’s face right off. But he takes a deep breath, wipes his semi-dry, slightly ashen hands on his black skinny jeans, and strides towards the door.

Only to be blocked by Sero one more time.

Bakugou snarls in frustration and is really ready to explode something, but the way that Sero fidgets like a goddamn schoolboy gives him pause. He waits, looking past Sero at the wooden door behind him.

“If you’re not upset, then,” Sero says, “wanna… you know?”

“Now?”

Bakugou stares at Sero as he reaches behind him with a freakishly long arm, grasps the doorknob, and locks it. A metallic click sounds through the bathroom and Bakugou feels liquid heat pool in the pit of his stomach.

Why the /fuck/ did this turn him on? He tries not to give anything away however, arranging his face into a blank stare when Sero ducks his head down closer to his eyeline to gauge his reaction.

“No one’s here,” Sero says as if he’s discussing the weather. “I checked. And maybe it’ll help you relax.”

“You think I needa relax?”

Sero shrugs. “Maybe.”

“Fuck you, tapehead.”

“I was thinking the other way around,” Sero laughs. He waggles his eyebrows like a cartoon character, rising back up to his full height and looking down at Bakugou with those half-lidded, lazy eyes and that goddamn smirk.

This is the final straw. A growl tears from Bakugou’s throat as he fists a hand in Sero’s stupid t-shirt and slams his back into the door.

Shock seems to radiate from Sero’s widened eyes, but his smile never falters for a second. He looks like a cat who’s gotten into the cream when Bakugou tilts his head up and crashes their lips together.

Sero tastes like barbeque and charcoal and IPA, and Bakugou nips and sucks and bites as much as he can, trying to expel as much of his pent-up rage as possible.

“Stupid, fucking –” Bakugou grunts into Sero’s still laughing mouth, “I’m gonna wipe that smile right off your fucking face.”

“Promise?” Sero says. His lips are still quirked, but his eyes look more intense now, gazing at him with a hunger Bakugou is now very familiar with.

Bakugou kisses him roughly once more before putting both hands on Sero’s shoulders and pushing him to take a knee.

Never taking his eyes off of Sero’s mouth, Bakugou unzips his pants and pushes down his boxers just enough so that he can pull his half-hard cock out. It bobs at attention in between Sero’s eyes.

“Open your fucking mouth,” Bakugou says.

It seems impossible at the moment, but Bakugou clicks his tongue when he sees that Sero is still smiling, on his knees and completely happy about it.

His eyes are wide, the corners of his lips are lilted in pure giddiness at how the situation seems to be playing out in his favor, and he licks his lips before complying with Bakugou’s demand.

Without any further hesitation, Bakugou slowly presses his dick into Sero’s waiting, warm mouth until he hits the back of his throat.

Sero grunts a bit at this, mouth wide and eyes crinkled as he shifts on his heels and tries to adjust his stance to accommodate the intrusion. Or maybe to adjust his own cock in his jeans.

“Fuck,” Bakugou whispers, feeling his cock fill out more as he drags it back out of Sero’s mouth. “That’s it. Keep your mouth nice and open for me.”

He thrusts back in roughly, causing Sero to retch a choked heave. It’s the best sound, and the way that Sero just takes it makes Bakugou’s head buzz with power and lust. Raking a hand through ink black hair, Bakugou grabs –

a fistful and pulls a moan out of Sero before slamming his cock home again. Sero groans out a strangled sound that’s somewhere between encouragement and distress as Bakugou sets a brutal pace, hand shooting out to steady himself on the door and balls slapping against Sero’s chin.

Tears prick the corners of Sero’s wide-open eyes and his hands clamp around Bakugou’s hips as he just holds on. The only noises in the bathroom are the slick plunge of Bakugou’s cock slipping in and out of Sero and Sero’s gagging with each deep drive to his throat.

“Hah, you look so good like this,” Bakugou breathes. He uses his grip on Sero’s hair to tilt his gaze upwards slightly, still fucking into him at this new angle. “Like you belong there, on your knees, taking my cock.”

Sero moans at this, the vibration of it sending Bakugou to another plane of existence. It is heaven and hell at the same time, it’s a tight string of pleasure pulling taut within Bakugou with every push of his hips.

There’s also the rush of power, having this smug bastard on his knees, but even with a dick in his mouth, Sero manages to belatedly flick his gaze up and raise his eyebrows in a teasing way, as if to say, "Do I /really/ belong here?"

Instead of getting angrier, Bakugou feels himself grin wickedly at the challenge.

“There it is again,” he says. “Gotta do something about that.”

Sero makes a noise like a question, but Bakugou ignores it. He pulls his swollen cock out of Sero’s mouth, forces Sero to his feet, and yanks him by the scruff of his neck up towards the sink.

Bakugou shoves Sero against the hard edge of the counter and gets into Sero’s space, leaning up to whisper in his ear.

“Pants off,” Bakugou says, inhaling the scent of cigarettes and wet tile.

Sero gives him a breathless, open-mouthed smile as he unbuckles his belt and pushes his jeans down to his mid-thigh.

“Now what?” Sero eyes are bright and crinkled in anticipation.

Something about it makes Bakugou want to slap him, but he also thinks Sero wouldn’t take too kindly to it, so he reels in the feeling as he steps out of his skinny jeans and throws them on the counter.

He’s on Sero in an instant, sucking his bottom lip into his mouth and gnawing at it viciously. Sero chuckles and moans at this, apparently enjoying how much of an asshole Bakugou is trying to be.

Bakugou breaks the kiss, then hawks a glob of spit into his own palm. He dives back in to suck hickies into Sero’s neck and reaches down to lube Sero up with his wet hand. Sero huffs out a breath at the touch, his eyes closed as he loses himself in the sensation.

When Bakugou releases him and repeats the action again, coating his hand with spit and reaching down to pull at him, Sero opens one eye and smirks at Bakugou.

“Want me to –”

“Just shut up,” Bakugou snaps. “I’m in charge right now so just stay still.”

Sero half laughs, half gasps as Bakugou gives his dick a rough squeeze. Then, he just watches, hands gripping the edge of the counter behind him, as Bakugou reaches around to jam a finger in his own ass. It stings like hell, but Bakugou realizes that he doesn’t want to wait.

He rips his hand out of himself, throws both arms over Sero (who is still grinning like the damn Cheshire Cat) and hoists himself up so that his feet are stacked on the slippery counter and his hips are lined up flush against Sero’s.

Sero’s hands instantly jump to hold him up, but Bakugou grabs one of them and guides it lower.

“Line yourself up,” Bakugou instructs. As soon as he feels Sero’s cock pressing against his hole, he sinks down on it immediately.

“Holy fuck,” Sero grits out as Bakugou envelops him inch by inch. His smile looks pained, almost like he’s reliving the worst moment of his life, but Bakugou knows that his unstretched hole probably feels fucking fantastic.

He feels himself puff up with pride at the thought, heedless of the pain the lances through his ass from not properly preparing himself.

“Don’t you dare move, asshole,” Bakugou whispers as he bottoms out.

He smirks when Sero just nods, his eyebrows still furrowed and mouth still open in a silent half-smile. Bakugou likes telling Sero what to do, but he also just needs a goddamn minute.

After a few seconds, Bakugou re-adjusts his grip on Sero’s neck, hitching himself up slightly and wrapping his legs fully around Sero’s waist and pulling himself flush so he can feel Sero’s bony hips against his own.

Bakugou uses the leverage of his clasped legs to roll his hips up experimentally, causing Sero to groan lowly and drop his sweaty forehead on Bakugou’s shoulder.

“Fuuuck, Bakugou, are you good now? Can I move?”

“Thought I told you to stay still.’

“Shit,” Sero says. Bakugou likes how Sero sounds when he curses as he sinks back down on his cock slowly. “I don’t know if I can control it fully.”

“You will,” Bakugou grunts, pulling himself up again so that the tip of Sero’s dick in him.

“If I feel you move a fucking inch I’m getting off and leaving.”

“Shiiit.” Sero groans it out like an animal in heat. “Fine, but you gotta move now I’m going to die, your ass feels so good –”

Bakugou ignores the rest of the rambling to start fucking himself on Sero’s cock achingly slow.

It feels like he’s on fire – the drag of Sero’s dick inside him is just this side of painful, his own rock-hard cock is leaking pre and rubbing between his and Sero’s bodies deliciously.

Bakugou throws his head back and grits his teeth at the waves of sensation, gasping and trying to find the one spot that will really get him going. As he drops down at a particularly good angle, he feels a jolt of lightning run up his spine as Sero’s cock prods at his prostate.

It jumpstarts a newer, faster pace, and Bakugou’s grunts turn into wanton moans and mix with Sero’s labored breathing as he really starts to move. His legs ache with effort, sweat starts to drip down his thighs in cold lines, but he doesn’t think about stopping for one second.

Bakugou realizes he’s closed his eyes, but he slits them open to see that Sero is finally, finally not smiling. His mouth is closed in a grimace in an effort to hold still while Bakugou fucks him into oblivion.

“Fucker,” Bakugou grunts, triumphant. “Where’s your shitty smile now?”

And of course, this makes Sero laugh, a grin returning briefly to crinkle his eyes and curl his mouth.

Bakugou grazes a hand down Sero’s chest, and back up underneath his t-shirt to pinch harshly at a nipple. His joyous expression disappears instantly, replaced with the same pleasured/pained face that Bakugou wanted to see.

It’s a fucking rush being able to reduce this cool, confident hero to a bumbling mess, though Bakugou can’t feel too proud for long as he starts to feel his legs give out.

He slows down to catch his breath, to which Sero lets out a longing, disappointed groan.

“Fuck, I need you to move now, I need you to fuck me, come on,” Bakugou gasps out, his thighs losing their iron grip around Sero’s waist and falling to the floor.

Sero growls at this, snapping his hips back so that his cock slips out of Bakugou. He grips Bakugou tightly by the waist, lifting him so his toes are barely touching the floor and spinning them around so that he can drop Bakugou on the counter.

Shoving Bakugou’s legs wide, Sero immediately sinks back into him in one fluid motion, and Bakugou feels his whole body go slack at the feeling, pure molten heat rushing through –

his bones as he gives in to Sero’s pace. He revels in the way he’s forced to arch his back over the cold sink, the way his head smacks against the cold bathroom mirror.

“Fuck yeah,” Bakugou mumbles, “that’s it, don’t fucking stop, don’t you fuckin’ dare –”

Bakugou closes his eyes knowing that Sero is probably silently smirking again as he cries out in pleasure, but he doesn’t even care anymore. He just wants to come. To that end, he snakes his hand down to fist his own cock in time with Sero’s thrusts.

“Shit, you look so good like this,” Sero grits out. “You gonna come? Come on, I wanna see you lose it, come on, come on.”

Sero is swift and precise in his movements, and in under a minute, Bakugou feels a hot wave of pleasure cresting and washing over him. He shudders hard, his cock dribbling cum and his ass tightening up.

Bakugou pants as he jerks himself through his own orgasm, eyes snapping open just in time to see Sero lose it, smile nowhere to be seen.

“Yes, fuck yeah, that’s fucking hot, Blasty –”

Bakugou feels Sero fall over the edge right then, dick twitching inside Bakugou’s ass as he rides out his orgasm. As he stills and starts to come back from it, Sero presses a kiss to Bakugou’s shoulder.

“Remind me to smile at you all the time from now on,” Sero murmurs.

Bakugou clicks his tongue at this, his words coming out angry even though he doesn’t quite feel it. “This wasn’t for you, you smug idiot.”

“I know, I know, you wanted me /not/ to smile at you,” Sero says. “But it’s kind of fucking funny how upset you get when I just wanna look at your pretty face.”

Bakugou feels like he’s been slapped. With /love/. Shit.

He hurriedly schools his shocked face into a grimace. “Fuck you,” he grunts. “Get out of me so I can clean up.”

“As you wish.” Sero says this with a shit-eating grin, which makes Bakugou push a palm into his face and shove him away bodily.

Sero laughs and watches Bakugou stalk around to grab toilet paper, wipe the load of cum dribbling out of his ass, and shimmy into his boxers and jeans. Sero does the same, and when they’re both decent, he goes to the door.

“Shit, I hope we weren’t too loud,” he says, unlocking the door and letting it swing open. “I didn’t hear anyone knocking on the door, so that’s a good sign at least –”

As if on queue, one, two, three bodies topple into the room with a smacking sound on the tiled floor. There had been three people apparently leaning onto the locked door, listening to the show.

“What the fuck,” Kaminari says, peering up at Bakugou and Sero from underneath Kirishima and Mina’s prone bodies.

Bakugou immediately steps over the idiots and walks down the hallway, shoving his hands in his pockets and completely ignoring the mingled yells and screams he hears from the bathroom.

He decides that it’s probably best to go home – Sero can tell him how that went later.

END

thanks for reading! this story is on ao3 https://archiveofourown.org/works/25157611 

special thanks to @useless_donut for beta reading

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kthnxbye