Izuku lets himself take control

Kissed by that beautiful hero...Izuku almost folded. But suddenly a stray thought struck him like lightning. If she was in charge, would she make him pull out?

Logic wasn't in charge, just his teenage hormones. He grabbed her legs and lifted her, she wrapped around him. He took her to his mother's bed, realizing his own probably wasn't big enough and didn't think to use his new power.

He striped quickly, he hadn't really thought about his cock in detail before, but it was clearly big judging from Rumi's slutty moan when she felt it rub her.

"Fuck me baby." Rumi moaned, arching into his grip.

"I'm going to fuck you better than anyone else." Izuku wasn't really thinking as he moaned this now truth.

And just like that, he was no longer a virgin. His sex addled brain felt like it'd melt.

The sex was brutal, half because that was what Rumi liked and Izuku was going to fuck her 'better' than anyone else, and half because Izuku couldn't think much less figure out a better technique then just raw power.

Izuku pounded her until she screamed, he fucked her even as she came, and he shot cum into her like a hose.

Only to yank her up and flip her over before another round. He fucked her like he owned her, and she adored it. And then a full nelson. And then a mating press, until finally he was done...for the moment.