After awhile they pull away, a string of saliva connects the two's lips. Katsuki looks so confused and covers his mouth and turns his head, embarrassed. Izuku chuckles and than leans in close. "Can I do anything for you?" He whispers. Katsuki nods and glances at him. "What?" "Make... make me happy..." Izuku blushes a bit. "I... I'll do my best." He gets up and turns off the lights. Katsuki lays down and Izuku crawls on top of him. He straddles the blonde and lifts up his shirt. He he notices Katsuki's pecks and starts rubbing them, "Katsuki... I didn't know you have tits, and I've known you forever~" He teases. "I- I don't-" Izuku plays with his buds, making him let out a groan. "Sure seems like it to me~" He grins. "W-well I never knew you had this side to you." "Same here." The green haired male starts licking the shell of Katsuki's ear. Katsuki bites his lip while Izuku licks down his neck and kisses his collarbone, leaving love bites. He than starts grinding on the blondes member, the friction already turned the blonde on, but the affection along with the sounds made him even harder. Izuku trails kisses all the way down his chest, all the way down his stomach.
Katsuki sits on his elbows, watching the green haired male pull down his sweats. He took out his raging hard on and starting jerking the blonde. "Wow Katsuki.. You're so big~" He coos. The blonde throws his head back and sighs. All of a sudden Izuku licks the tip, making Katsuki's member twitch in his hand, "Nngh.." the blonde groans. Izuku than takes the blondes member into his mouth. Katsuki groans out, bucking his hips as Izuku bobs his head and sucks him off. Katsuki grabs a handful of his hair, and pushes his head down. "Izuku..~ mm~" He moans and pushes against the back of Izuku's throat. The green haired male moans sending vibrations through Katsuki's member. His toes curl and he bucks faster in and out of Izuku's mouth his eyes tear up a bit and his throat tightens up. Katsuki groans and cums down his throat. Some drips out the side of his mouth, he pulls off of Katsuki and licks it back into his mouth. He catches a breath and flares at Katsuki who's covering his face, member harder and somehow larger. Izuku gulps and bites his lip. He crawls on top of Katsuki and grabs his hands, bringing them to his mouth. "I-Izuku..?" He whimpers. Izuku sucks his fingers and grinds against him, Katsuki blushes deeply watching his slimy tongue curl around his fingers, getting more and more turned on. 'He's good at seduction...who knew?'
Izuku takes off his pants and slowly pushes himself into Katsuki's hard cock. Katsuki grabs his hips and grunts. "Tight... so.. tight~" Izuku moans too, going all the way down. After getting used to his size, Izuku starts bouncing up and down on Katsuki's member. They both start breathing heavily and Katsuki thrusts up into Izuku harder, making him moan out. Katsuki thrust faster against Izuku's prostate, making him pant, moan, and groan. Seeing Izuku's lewd expression makes Katsuki pound into him, hitting his G-spot with. Every. Single. Thrust.
Katsuki had to cover Izuku's mouth to keep some of his moans hidden. The loud sounds of the springs in the bed start to get blocked out from their minds as they get close. Katsuki quickly gets up and hunches in between Izuku's legs, pounding into him even harder, the sound of smacking could be heard outside of the room. Izuku's legs flail behind Katsuki's back as their breaths mix together. Finally with one last thrust, Katsuki let's out a huge load into Izuku.
They both let out large sighs/moans. Katsuki pulls out of Izuku and leans against the headboard holding his forehead. Izuku lays in his side, trying to calm down from his high, cum leaking from him.
'I just fucked the shut out of my childhood crush..!' Katsuki covers his mouth looking off to the side blushing darkly. Izuku looks at him and smiles. "Are you happy now, Katsuki?" The blonde looks at him and gives a gentle pure smile. "Yes, Izuku. I'm happy. Very happy."

(Hope you enjoy!!)