Chapter Text
Katsuki may have a bit of a problem. It wasn't as glaring of an issue when he was living in a home with soundproof walls and parents that were rarely ever home, but it became very obvious when he moved into his university dorm at UA.
You see, Katsuki had what more sophisticated people would describe as a "high libido." Others would say that he was insatiably horny. Simply put, he can't go a night without jacking off. Again, not so much of a problem with a soundproof house.
But when he has a roommate in a small dorm room where the beds were only a few feet apart? Yeah, that's gonna be a problem.
He spent the first few days trying to be discreet in the showers, but there was always some else in a stall next to him and the curtains were much too short, short enough to know when someone was jacking off on the other side of it.
It also did not help that his roommate was hot. Kirishima Eijirou was gorgeous. How could someone be so hot??? It was unfair. And he was always working out. Shirtless. It was like this guy was trying to kill him.
Kirishima was also probably the nicest guy Katsuki has ever met. Katsuki knew how he came off: grumpy, mean, standoff-ish. But all this guy has done was shown him kindness and understanding.
After the first night of not being able to jack off, Katsuki snapped at Kirishima for breathing too loud. At the end of the day, Kirishima sat him down and told him that he got him noise-cancelling headphones that could make him more comfortable in the dorm since he couldn't change his breathing.
Ever since Katsuki grumbled about Kirishima's dumbbells being strewn across the floor, Kirishima made sure to pick up after himself when he was done working out.
He never opened the blinds in the morning without making sure Katsuki was already awake, he would bring coffee in the morning if he woke up earlier than the other, and so many other things.
He was just a nice guy. And he tolerated Katsuki. Hell, maybe even liked him as a friend. And that made only made his crush grow stronger.
But Katsuki still had needs. A week had passed without a proper jerk-off session, and he was getting antsy. When Kirishima wasn't in the dorm, Katsuki either had class or work. He couldn't find alone time at all.
He knew if he asked Kirishima to leave for 15 minutes a day, he probably would because that's just the type of guy he is. But Katsuki didn't want to ask him of that. Then an idea popped up in his head. An idea that could be horrible, but oh so great.
He could just jack off in his bed when Kirishima was asleep. He was used to sleeping at 9pm, but his roommate fell asleep at what, 10pm? He would stay up another hour if it meant finally getting the release he needed.
It was a good set up. He made sure to be absolutely silent the first two nights, but after noticing that Kirishima was dead asleep, he got more brave. He let himself let out little breaths and gasps, not loud enough to wake anyone up but enough to fill the silent room.
It was a week and a half later that normal jacking off wasn't good enough anymore. You see, Katsuki loved having his prostrate touched whenever he came, whether that be with his fingers or a toy. He had bought toys back at home, but he knew he couldn't bring it to his dorm. So his fingers would have to do.
But Katsuki gets louder when he's playing with his ass. But it shouldn't be loud enough to wake up Kirishima, right? He seemed to be a deep sleeper. He should ask to make sure.
During their daily conversation in their dorm after class, Katsuki decided this was the perfect time to ask. "Hey, Shitty Hair?"
"Yeah?" He was used to the nickname.
"Are you a deep sleeper?" There was a slight pause.
"Yeah, my moms say I'm a pretty deep sleeper."
"Cool."
That night, he fingered himself for the first time in what felt like forever. He imagined they were his roommate's fingers. The scarred, thick fingers he had seen, had watched lift weights, had seen spinning pens in class when bored. Those deft fingers would feel amazing inside of him. He had the best orgasm he had ever had in a long time.
He can continue the semester like this, talking and hanging out during the day, and having his own solo sessions while Kirishima slept.
Eijirou was screwed. He was in love with his grumpy roommate, who just so happened to jerk off every night.
The first week was normal. Bakugou seemed grumpy, but overall a cool dude. An awesome dude, in fact. He was smart, way smarter than Eijirou could ever be, and honest. He wasn't afraid to speak his mind. He was effortlessly confident, something Eijirou strives to achieve.
So he grew a little bit of a crush on his roommate in the first week. Which was fine! They were becoming really good friends.
It wasn't until that one night where he was just laying in bed, closing his eyes, when everything changed.
His moms used to get annoyed at him as a kid because he would lie in bed for an hour before actually falling asleep. So to fall asleep at a normal time, he hops into bed at 10pm, pretending to sleep, in hopes of sleeping at 11pm.
So it came to a surprise to him when all the lights were off in the dorm room at 10pm when he heard rustling and soft breathing. At first he thought it was just his imagination playing tricks on him, Bakugou was asleep.
But the same thing happened the next night. And the night after that, Bakugo started to make more noises. Little breaths and gasps that were hard to hear if you weren't paying attention. But Eijirou was paying attention. He listened to every single soft sound that was made, every gasp. What was Bakugou thinking about? How was he touching himself?
Sometimes, if Eijirou listened real closely, he could hear the squelch of Bakugou's fist quickly moving up and down his cock. Eijirou wondered what noises Bakugou would make if it were his hand instead. What sounds would be made if he squeezed a bit harder, twisted a little at the head. Would Bakugou like that?
He doesn't remember how many nights passed until Bakugou started fingering himself. When he first heard the wet sounds and the loudest gasp he had heard from Bakugou, he wondered what was going on. It wasn't hard to deduce that Bakugou had a finger up his ass. Could this get any better?
Katsuki seemed to get louder, having trouble keeping his gasps and moans in control. Eijirou once again wondered, what if that was me? How would Bakugou react if it were his fingers instead? Would three be too much? How many fingers would he need in order to be big enough to fit his cock? Would he be tight? He probably would, he'd be perfect for Eijirou.
Would he make more noises if Eijirou played with his nipples? If he kissed his neck? Was Bakugou a kisser during sex? God, that would be so hot. Giving open-mouth kisses as he slams into that tight ass.
After Bakugou orgasms, he falls asleep right away. Eijirou jerks off right when that happens, imagining himself in those scenarios. It usually doesn't take long, never takes long when he's imagining Bakugou. Just a few strokes and he's coming. He'd never felt the urge to jack off every day before coming to college, but how can he not when he has the hottest roommate just a few feet away from him?
"Mm, Kiri." Eijirou must've heard wrong. Bakugou wasn't actually calling his name while jacking off.
"Kirishima, so good." Okay so this was actually happening. Eijirou can stay calm. Breathe in, breathe out-
And then Bakugou let out a long, drawn out, breathy moan followed by Eijirou's name. Again.
So Eijirou did what any sensible person would do. He whipped out his dick and started jacking off.
Each breath and gasp and moan just turned Eijirou on more. He quickened his pace, hoping Bakugou couldn't hear it past his own squelching. Did he get lube to finger himself? Or does he magically get wet?
Eijirou wasn't thinking straight, couldn't think straight. His crush was getting off to thoughts of him, just a few feet away.
The closer to orgasm he got, the more reckless he got. He didn't even notice that his breathing had gotten heavier and Bakugou seemed to be talking to him.
"Kiri, don't stop. I'm almost there. Mmm, your fingers feel so good inside me. Prepping me for your cock. Fuck, Kirishima, I'd be so good for you, so tight."
"You sound heavenly, Kiri, fuck, I'm so close, Eijirou-"
Hearing his given name, Eijirou came with a shout. If it sounded like Katsuki, that's for Bakugou to decide. The other also seemed to reach his end, groaning as he slowed his pumping.
"Eijirou? Are you awake?"
"…Yes."
Katsuki's voice wavered slightly, only something Eijirou could catch. "Since when."
"Since the beginning." It was dark, but the two were facing each other as they each laid on their respective beds.
They both stayed there in silence.
"We should probably talk."
"In the morning?" But Eijirou could hear the hidden question. Will you stay?
"Of course, Katsuki."