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Ever since Katsuki entered U.A. he thought that he had learned to deal with his craving as well as keeping them a secret from his classmates. No one questions his habits. Chewing on his pen or biting his nails isn’t seen as more unusual than Deku squeezing his bottom lip when he gets into one of his muttering fits. Snacking on dried chilis still gets him some weird looks though. However that’s more due to the choice of snack than the fact that he is snacking in the first place. But he loves chilis. Spicy things are his comfort food. Chilis are also perfect because they keep his mouth busy for a long time. It’s not something that can be gobbled down like popcorn. He likes to savor the different levels of spice and how it makes his mouth and tongue tingle. Yes, Katsuki had his habits in check. Until Todoroki Shoto came along.
They are about to change into their hero costumes for combat training class when Katsuki gets a glimpse of the base of Todoroki’s cock before he pulls up the zipper of his jumpsuit. Has he always been going commando? Katsuki has never paid any attention to his classmates when they got changed. It’s not polite and he wouldn’t like others staring at him while he got undressed even though he has nothing to hide. It’s just common decency. So he really has no idea if Todoroki likes to freeball or not. He shakes his head. Why should he even bother about what Icyhot is wearing under his hero costume or not? But no amount of shaking seems to get this thought out of his head.
Throughout the class his eyes keep seeking Todoroki and when he is close enough, Katsuki can’t help how his glance goes down to his crotch. And fuck, he doesn’t know if he’s making things up or if he really can see his dick outline through the fabric of his costume when he moves in certain ways. It’s only now that Katsuki notices how his mouth keeps switching between almost watering and then feeling very dry again. And fuck, suddenly he can’t get the image of Todoroki’s cock in his mouth out of his head. God, he wants to punch him in the face. Him and his ridiculous dick taunting him. Him of all people.
“Fight me!”
Katsuki pushes Deku aside who was currently sparring with Todoroki. Maybe actually punching him in the face will free him from these cursed thoughts. Todoroki doesn’t seem to mind changing his training partner. Of course he doesn’t. Katsuki knows he considers him a good friend. Their quirks and skills are on par too, so sparring together always feels very satisfying and most effective in regards to honing his skills. However today’s training might not turn out as effective as usual. The best way to take out a long-range fighter is close combat, so Katsuki has no choice, but trying to get close to Todoroki. He keeps slipping and Todoroki lands a lot more hits than usual. Katsuki has to admit that Todoroki has improved his close combat skills a great deal ever since they fought one-on-one for the first time in the sports festival finale two years ago. But with his mind being distracted he also makes a very easy target for Todoroki. Katsuki realizes that there is probably only one way to solve this problem.
Just at this moment Aizawa announces the end of the class and everyone heads towards the locker rooms. When Todoroki turns to leave, Katsuki grabs the back of his uniform. He gives Katsuki a puzzled look.
“Kacchan! Todoroki-kun! It’s time to go.” Deku waves from the door.
“I won’t go until I sent Todoroki to the floor!”
Todoroki just looks back and forth between his friends and then shrugs. Only when everyone has left he turns to face Katsuki. “Are you sure you’re gonna land a hit today? You were unusually preoccupied today.”
“Whose fault do you think that is?”
Todoroki just blinks at him in confusion. He can’t really blame him, he has no mind reading quirk after all.
“Do you have stomach problems? There is a pressure point on the sole of your f—”
Katsuki sends him flying before he can finish his sentence and it’s just because he was hit by surprise that he indeed falls to the ground. Todoroki gets up from the floor and brushes off the dust from his face and clothes.
“We are done.”
That didn’t go as planned. Katsuki has no idea how to buy more time now. He was hoping he’d get to keep Todoroki busy until the locker room is empty.
When they join the others, only some have already left. Kirishima doesn’t mind going back to the dorms in his stinky uniform and Iida was surprisingly fast changing out of his bulky suit. Katsuki slumps down on the bench in front of his locker, but Todoroki immediately begins to change, starting with taking off his boots first. Alright, one last try.
“Show me that stupid pressure point.”
Todoroki turns around, looking a bit surprised, but then sits down next to Katsuki. “You need to take your boots off.”
“Just show it to me on your foot.”
Todoroki blinks (like he does so often when he needs a moment to process and analyze someone’s behavior), then nods and pulls his foot up onto his knee. “So…”
Katsuki doesn’t even really listen, but pretends to watch at least what Todoroki is showing him when he’s not glancing sideways to see his classmates leaving the room one by one.
“See you later, Kacchan! Todoroki-kun!” Deku is the last one to leave.
Katsuki sighs. Finally.
“We should hurry up. I hope you feel better soon.”
Todoroki stands up and hearing him pull down the zipper is like a trigger. Katsuki lunges forward, grabbing him by the collar to slam him backwards against the locker. He sees him open his mouth to ask a question. “Shut it!” They stare at each other for a few seconds and Katsuki can feel the heat spreading over his cheeks.
“Take it out.”
When Todoroki doesn’t seem to get it, Katsuki glances down between their bodies and back up. He can see the ‘oh’ written all over Todoroki’s face. Impatiently he drops to his knees and does it himself.
“You think you can walk around, jiggle your dick and expect everyone to just ignore it?” Katsuki mutters more to himself.
“I forgot my jockstrap in the dorms.”
Katsuki shushes him again, he doesn’t want to hear whatever excuse he has and grabs his cock by the base. Katsuki swallows. It actually looks a little intimidating up close. He’s definitely bigger than Katsuki (and cut) and he has no idea how much he can grow. Katsuki swallows again. His throat aches from how dry it has become. He has to keep his mouth busy to distract himself. Now .
Tentatively he swallows the cock head. It has a kinda spongy surface and fits comfortably into his mouth. He sucks on it like on a lollipop, but the taste is far away from being sweet. Katsuki’s lips inch forward, feeling how the skin becomes smother. His tongue explores the anatomy of Todoroki’s cock in all detail, mapping out the vein running along the side of his shaft and the big ridge on the underside of it. He’s confident that in this state he can fit almost all of Todoroki’s dick into his mouth, takes him in as far as possible and pulls off almost completely a few times, slowly, to fully relish all the new sensations of discovering a new object with his mouth.
However he feels how the shaft slowly gets firmer, his teeth suddenly scrape lightly over the skin and the tip starts to bump into his throat. Katsuki needs to adjust to the growing size filling up more and more space in his mouth. There is a new taste in his mouth and he can tell exactly the difference between his saliva and the more viscid pre-cum, mixing both fluids together on his tongue. He listens closely to the quiet squelching sound that his spit-slick lips create while sliding on and off Todoroki’s cock.
It’s only now that he registers the noises that Todoroki makes too, the heavy breaths he takes, the low moans whenever Katsuki swallows him to the hilt, the relieved sigh when it’s just the tip staying in his mouth.
But soon Katsuki’s focus centers around everything going on in his mouth again, losing himself in savoring all the different sensations and how they keep changing. He produces a lot more spit to make the glide easier, so much it drips down his chin. His lips are being stretched almost uncomfortably with how big Todoroki’s cock has become, taking up all the space in his mouth and still not fitting completely. Katsuki tries to relax his throat to take in more, to take in all of Todoroki, fighting against his gag reflex, exhaling long and slow through his nose and finally Todoroki’s dick slips past the tight blockage. He squeezes his closed eyes tighter shut when tears start to well in the corners and his throat constricts, causing him to let go of Todoroki completely to gasp for air. But three breaths later he sucks him back in, chasing the feeling of fullness and with the initial inhibition overcome once, it’s a lot easier to deepthroat Todoroki’s cock again.
Hands gripping his head pull him out of his frenzy for a short moment. But he grabs Todoroki’s wrists, slams them against the locker and holds them there in place. This is not about him. Katsuki won’t accept any distractions, can’t let his focus shift to different places at once. He sucks cock like a mad man, barely notices how Todoroki’s hips start to buckle, but he surely notices how the dick in his mouth twitches, knows what’s going to happen next and he moans, planting his lips to the base of Todoroki’s cock when he spills his cum down his pulsing throat. His palms set off little sparks, crackling like pop rocks while he swallows, swallows, swallows.
Katsuki pulls off and Todoroki is still coming, a big dollop of cum landing on his tongue. When he opens his eyes, Todoroki holds his cupped palm in front of Katsuki’s face. Like hell he’s gonna spit. He closes his mouth and gulps audibly, baring his teeth when he grins and stands up to look Todoroki straight into the eye.
Maybe Katsuki’s fixation has grown stronger again and it gets harder having his habits in check. Chilis are only his second favorite things to keep his mouth busy now. And maybe Todoroki keeps forgetting his jockstrap at the dorms.