The school is supposed to be empty by now. It's late enough into the evening that the locker room should be as barren a wasteland as Aizawa's stomach is. Training is done, all the students should be back in their dorms probably doing homework or having dinner, and Aizawa should be able to shower in peace and head home like he always does on Thursdays - key word being 'should'.
Tonight it isn't empty. Aizawa steps into the locker room and is immediately assaulted by the sounds of sex. He knows that's what it is, there's not a doubt in his mind. The moans and gasps and the slick sounds of skin slapping against skin are unmistakable. He wants to leave, because they don't pay him enough to break up something like this, but then he hears a name that piques his curiosity - Shouto.
Even worse is he recognizes the one who spoke, who moaned, and would recognize Bakugou Katsuki's voice anywhere, even as breathy and sexy as it sounds now.
Realistically, he knows he should leave, because fuck he really doesnt need to be here, not for this - But he also wants to see. Something dark and wrong deep inside him is excited by the idea of watching them, and from the sounds it would be quite the show. His hand is on the door, ready to leave because he needs to leave, right now. But Aizawa is frozen in place when a loud, broken moan echoes through the locker room and the sounds of fucking get louder and faster as one of them gasps out harder.
He's weak, he's so fucking weak and disgusting, but he cant stop himself from walking towards the noise. The light is still on in the shower room and Aizawa creeps as soundlessly as he can through the hallway, the noises getting louder the closer he gets. They aren't even trying to hide, like they want to get caught like this.
Aizawa doesn't have to search, he isn't even in full view of the room when he sees them. He presses himself as close to the wall as he can so he's not seen and nearly dies at what he sees.
Bakugou and Todoroki are completely naked, soaking wet and fucking on one of the benches in the middle of the room. Todoroki is straddling the bench, legs spread as he leans back with his arm behind him for balance. Bakugou is sitting in his lap and bouncing on the taller boy's dick like it will be the key to making all his dreams come true. It's the single most incredible thing Aizawa has ever seen and he's painfully hard within minutes.
It's definitely not what Aizawa was expecting, Bakugou is always so aggressive and in charge but he's taking his classmate's cock and moaning like a whore while he does.
"F-fuck, deeper." Bakugou begs and Aizawa's knees almost give out. Bakugou sounds so needy, so desperate, and he's crying out, choking on words when Todoroki gives him exactly what he wants.
Aizawa palms himself through his pants and feels like a disgusting old pervert. But fuck, they look so good like this.
"Say please, Katsuki." Todoroki sounds so calm, so amused, and Aizawa's dick throbs right along with Bakugou's breathy little cries. "Please, please."
Todoroki pulls Bakugou off his cock, the blonde tossing out angry threats before he's being turned and pressed chest first against the bench. Todoroki has Bakugou hips raised, that stunning ass on full display before he's sinking back in and Bakugou is gripping the bench with whine that almost has Aizawa coming in his pants.
Todoroki fucks him deep, just like he asked for, and Aizawa is sure his sanity is going to suffer for what he's seeing right now.
"Look at you, Katsuki. If you keep screaming like that someone might come looking." Todoroki sounds like that's exactly what he wants, and Bakugou's face says he wants it too.
"Oh f-fuck, no one is here." Bakugou is struggling to form words around the moans echoing through the room. Todoroki snaps his hips forward when Bakugou says 'here' and the boy jerks and screams. Aizawa was so focused on the two of them together he hadn't even noticed how hard Bakugou was. His hand goes to his dick, hard and red and dripping precome against the bench, and Todoroki stops mid thrust.
"If you touch your dick I swear I will freeze your hands to the floor." Of course the pretty one was a sadistic bastard.
Aizawa's dick liked that very much.
Bakugou growls but moves his hand, dick still hard and straining between his perfectly toned thighs. "Good boy." Aizawa can't get over how pleased Todoroki sounds. "You're gonna come on my dick and nothing else, aren't you?."
At this rate Aizawa is gonna come before either of them do.
"Fuuuuuck. F-fine, yeah - yeah." Bakugou pants out each word waiting for Todoroki to move again.
"Who do you think would walk in here now? It's so late it would have to be one of the teachers." Todoroki starts to slowly rock his hips and Aizawa watches Bakugou melt into it pitifully. "Maybe All Might? Fuck, he might have a heart attack if he saw you stretched on my dick like this, Katsuki."
"Bastard! Shit, let, ah let me f-fucking come." Bakugou is shaking, even Aizawa can see it from where he's peeking behind the wall. Todoroki just keeps going, slow and deep and pulling the filthiest noises from Bakugou that Aizawa will hear in his dreams for the rest of his life.
"Who else, Katsuki? Tell me and I'll let you come." Katsuki curses into the metal bench.
"Fuckin' Mic, loud a-asshole would probably freak the fuck out." Bakugou grounds out between clenched teeth. Aizawa wants to see how pink and puff his rim must be, slick from lube or spit and stretched wide around Todoroki's cock. Is that why he's struggling so hard?
"Mm what about Aizawa?"
That pulls a ragged moan from Bakugou and Aizawa's fingers tighten around his dick before he comes from the sound alone.
"Oh, do you like that one? Wanna have him walk in here and call you a spoiled brat, maybe tie you up with his capture weapon while you're still hard?" Aizawa nearly moans. He can see it so clearly and having Bakugou tied up like that would be sinful. "Bet he wouldn't even let you come - I'd bet money he's the worst kind of sadist."
Bakugou's forehead hits the bench and he sounds more like an animal than a human when he moans, broken and wrecked while Todoroki tells him how Aizawa would fuck him.
"Someone is hot for teacher." Todoroki chuckles darkly, hands leaving Bakugou's hips to pull him back by his elbows and use the new position to fuck into the blonde boy so hard his dick slaps against his abs with each sharp thrust of Todoroki's hips. "Want him to fuck you like this, Katsuki?"
"Yes! Fuck! Ah, Ah! Yes, want it so bad - Need it. Fuck, Shouto let me fucking come!" Bakugou yells desperately into the room. Its so fucking loud, echoing all around them along with their harsh breathing and open mouthed groans. Aizawa isn't even trying to hold off anymore, stroking his own cock hard and fast in time with the sound of Todoroki's hips slamming into Bakugou's. Bakugou wanted Aizawa to fuck him… His mind couldn't process it, not now.
Aizawa hears more than sees Bakugou come. He's so lost in his own pleasure, orgasm crashing over him like a fucking tidal wave, he cant focus on the way Bakugou finally comes, untouched, across the bench and the floor in front of him.
There's a mess in Aizawa's pants, come sticking to his fingers and the inside of his underwear, but he can't be bothered to care. He's just had the single greatest orgasm of his life. He wants to stay and watch, see Todoroki finish inside Bakugou's oversensitive body, but he can't risk getting caught, it's bad enough he's stayed this long.
So, Aizawa takes one last look, floored again by how perfect they look together, and makes his way back to the door as quietly as he came in. He can still hear them even after he shuts the door and his mind can't help imagine what would have happened if anyone else might have caught them. They probably wouldn't have watched or gotten off on it, on knowing his students thought of him while doing that.
"Fuck." It's too much and not enough. Aizawa is still seeing them when he closes his eyes and his pants are growing even more uncomfortable as he makes his way out of the school and towards his apartment nearly twenty minutes away...
He'll just have to suffer with the mess until he gets home.