Izuku thought it was a little overkill when Kacchan shoved him, along with Kirishima, in an empty classroom and locked the door behind him.
"I'm not about to let you two fuck in the hallway," he said then, sounding offended. Izuku would have rolled his eyes — Kacchan can be so dramatic — Kirishima was just being his affectionate self, indulging in some very light PDA and Izuku was letting him because hey, it was nice to have his strong arms around his waist. His warm chest pressed against his back. Having him reminiscing about last night in filthy whispers directly into his ear...
Well, okay, it's true that Kirishima is physically unable to whisper so it's not impossible that someone might have realized that their embrace may not have been completely chaste — even if they couldn't see how hard Kirishima was against Izuku's behind.
He was quickly sandwiched between his two… friends? rival with benefits? They still needed to have a conversation about this but this was obviously not the right moment, not with Kirishima’s hands going straight for Izuku’s belt.
“Thanks for the assist, bro! It was killing me to have to wait ‘til we’d be back at the dorms, you wanna join in?”
Kacchan buried his hands in his pockets. “Nah I’ll just watch, get that out of your system,” he said, as he put on an unaffected air that Izuku could see right through — even his saggy pants couldn’t completely hide his excitement. Izuku wondered if it was the near-public location that was doing it for Kacchan, as it definitely factored in making Izuku completely hard the moment he realized this was gonna go further than a quick grope and then gone, their privacy only hinging on no one glancing through the window inside the classroom.
Kirishima made him bend forward with gentle pressure on his back as he pushed down his pants and underwear, making him lean on Kacchan’s chest for support. Ah, Kirishima was in a giving mood, seemed like, making it tempting to close his eyes and relax into his touch.
“Midoriya, can I do it? You said next time I could, right?” These words said with a husky voice made Izuku unexpectedly tense, scarred fingers wrinkling the white fabric of Kacchan’s shirt as they clenched, not unlike how they wrinkled his bed sheets last night, when Kirishima brought the idea that he wanted to…
When Izuku ultimately turned him down because he was taken off guard, he wasn’t ready, couldn’t comprehend the genuine desire in his friend’s eyes…
But he agreed to next time, because Kirishima’s puppy eyes are a weapon. He expected more time to prepare (and research) though!
“N-now? But it’s the middle of the day! I haven’t taken a shower or-ah!” He flinched when what was definitely a tongue slid over his hole, warm, wet, and very much not shy. That’s what he gets for getting stuck in his head and taking a moment too long to answer.
On his knees behind him, he cocked his head to the side. “It’s not bad, right?” Another lick, keeping his hold on Izuku’s hips firm to stop him from escaping his touch, “You’re so cute and manly! Please let me…” He looked unfairly adorable with his face half hidden in his ass, begging for the strangest treat. The quick kisses he started to press there made him want to push back against all logic.
“But it’s… dirty…” He looks at Kacchan for support and… yeah, no, this smug jerk was obviously siding with Kirishima.
It was plain that Kirishima was paying more attention to his traitorous body language (dick still hard and twitching, leaking precum onto his underwear, squirming but not away…) than his words because his tongue continued its business. More and more enthusiastically even. And it very much wasn’t bad, especially when he opened his mouth wide enough that Izuku could feel the lightest brush of sharp teeth so close to this sensitive place. And Kirishima looked so into it, his objections felt trivial next to the satisfied moan he made when his tongue adventured inside.
One of his hands flew up to the back of Kacchan’s neck, anchoring himself more securely. Doing so he met his eyes briefly, saw how intently he was looking at Izuku. He couldn’t hold that gaze for long.
Izuku didn’t think he really understood the feeling of being wanted before this moment — here between them — being eaten out so eagerly by Kirishima’s talented mouth, being devoured by Kacchan burning eyes. His breath hitched, a warm sting building up behind his eyes.
Rough, warm fingers suddenly slipping in-between his scarred ones stopped his emotions from spiraling out of control. “Bet he’ll make you come, nerd, without even touching your dick,” Kacchan said, voice low and raspy at first, then louder, “Won’t you, Shitty-Hair?!”
Kirishima pulled away from his succulent treat, grin wide, “Yosh! I will!” he shouted too loudly before diving back in.
Katsuki clings to his shoulders and he can feel the warmth of his palms through his shirt. Eijirou wouldn't be surprised if the fabric ended up with burn holes. Katsuki’s head is nestled between Eijirou's pecs, his breath humid and hot and he keeps swearing every time Izuku pushes his fingers in.
"Sugoi Kacchan! You're taking three fingers so easily!"
Three fingers already? That's really hot. Eijirou trails his fingers along Katsuki's side, feeling his trembles, appreciating his small waist and how he arches back into Izuku's touch — despite all his grumbling about how he should be the one fucking the nerd into the mattress. If Eijirou tilts his head to the side he can see his dick hard and still trapped into his boxers; the wet spot at the tip keeps getting bigger. Katsuki's body is so lewd.
Izuku's scarred hand covers Eijirou’s other hand, the one that rests possessively on Katsuki's burning nape, and slowly pulls it down the curve of his back.
"I think Kacchan could take more," he says with an excited glint in his eye as the tip of Eijirou's fingers brush where Katsuki is spread open around Izuku's.
Katsuki looks down at the meal spread before him. Eijirou's back is a fucking work of art of bulging muscles as he strains to hold himself up. Deku's scarred hand is stroking up and down the length of it as he mumbles praises and encouragements. His fingers hook into the back of the collar again, giving it a couple tugs, making Eijirou whine.
That collar is why this morning escalated to sexy times faster than Deku can mumble random facts about All Might. Katsuki and Deku were sipping on their coffee, scrolling the hero news, when Eijirou walked in, shirtless (not unusual for him) and sporting a new addition around his neck.
It's been a bit of a recurring banter topic for them to tease Eijirou on how his hero mask looks like kinky gear, and he keeps denying it, telling them one day he'll be wearing actual kinky gear and then they'll see for sure that his mask is different.
In his own opinion, the mask is still kinky — and he's pretty sure when all's said and done, Deku will agree with him — but that collar made all his blood rush to his dick so fast he felt light-headed. Eijirou should have known better than to get the Wonder Duo horny for him at the same time.
So that's how they got there, with Eijirou on all fours and Katsuki in the best fucking position to enjoy him. His hands grope and massage his ass, spreading his cheeks to show his hole, and he can't help grinding his hips into him, the bulge tenting his boxers poking Eijirou's taint, and Ei pushes back into him.
"Come ooonn bro, stop teasing already!" Eijirou never has any patience when he's the one getting fucked, they’ve barely started and he's already leaking on the bed. Sometimes they'll stretch the foreplay until he's driven mad; Deku especially loves running his mouth all over him until he's crying, but today Katsuki doesn't really want to take his time. He wants to see his dick disappear inside that perfect body, pound him hard and fast, grab that collar and pull Eijirou up as his cock's still deep inside of him, make him arch all pretty for them.
He tells him all that, "And Deku will fuck your mouth, and I'm gonna use that collar to decide how deep you take his dick, how's that, hah?"
Eijirou starts to say something (knowing him, it was definitely gonna be loud and enthusiastic agreement) but he's cut off by Deku shoving fingers into his mouth.
"I don't think you have any say in this, Ei," he says, leaning down to speak directly into his ear, then giving it a nibble, "After all you're the one with the collar here so you have to do as we say."
Katsuki can hear the wet sounds of Eijirou slobbering all over Deku's fingers. Music to his ears.
Deku turns his head towards him, his cheek still nuzzling Ei's fuzzy undercut. "I think Kacchan's idea is great," he says with eyes burning with anticipation. Katsuki pushes his tank top up to his collarbones with one hand, enjoying the spark of hunger in green eyes as he pulls on one of his nipples. He knows he's hot when he's in charge — he's hot all the time — and he likes the attention, so sue him.
"Pass me the lube, nerd, gotta make this end sloppy too."
The lube is passed, and Katsuki doesn't bother warming it, just squeezes the bottle over Eijirou's pretty asshole, making him yelp and flinch with his whole body at the shock of cold. Katsuki rubs circles around the rim with his thumb, dipping the tip inside easily. Fuuuuck, he could probably take it without much more preparation.
He shoves down his boxers and his cock springs free, coming to rest in the tempting cleft of Ei's ass. He wants to do everything to that ass. His hand comes down on it sharply, making a satisfying sound, and again his fingers dig into the flesh as he spreads him open one-handed, Katsuki’s hips rolling so his dick can slide over Ei’s hole.
He squeezes more lube onto that mess and Katsuki’s dick twitches; maybe because of the cold liquid dripping onto it, or more likely at the sound of Eijirou moaning sweetly around Deku's fingers. This is frankly an unnecessary amount of lube, coating the inside of Ei's thighs and dripping down his balls, adding to the mess of his leaking dick on the bed. It's all over the front of his boxers and pants he didn't bother to remove. It's gonna be slippery as hell when he gets inside him but Katsuki doesn't care, he wants to hear the wet, messy, dirty sounds of Eijirou taking them.
He drops the (now empty) bottle and guides himself into a hot, sloppy heaven.