She rides Izuku!

Setsuna pushed Izuku onto his back on the floor. "I'm going with cowgirl. I wanna be on top today."

"Sure thing," he chuckled as she proceeded to straddle him. As she lowered her hips, he reached forward, grasping his own member to ensure it went right up into her snatch. Her folds parted, and she crooned, placing her hands on his chest while he rested herself on her waist.

"Mmm, go ahead and buck a little bit, don't leave all the work to me," she told him, and he obliged, and she began grinding her hips against his pelvis quickly.

"Heh, getting right into it," he remarked, and she giggled, dragging her nails against his chest slightly.

"Well, we are going for a quickie, remember?" she winked, lifting and dropping her hips at a feverish pace. "We only got so much time to cum, after all," she pointed out.

"Fair enough," he nodded. "In that case..." He slid his hands up her body, and gently cupped her boobs.

"Mmmnh!" she cooed as she immediately turned on the hyper sensitivity of them. She leaned forward a bit to press her tits into his hands.

He gave them a squeeze as he bucked his hips up into her a few more times. Normally, they would draw this out some more, but they were pressed for tomorrow, so they were rushing to orgasm this time. As a result, it didn't take long for their climaxes to approach. About ten minutes in, Izuku and Setsuna cried out together, Setsuna cumming on cock the moment he released his seed into her.

Panting, Izuku sat up, encircling Setsuna with his arms, and meeting her lips with his. She hugged him right back, and they simply spent the next five minutes making out. They then broke the kiss, and Setsuna grinned. "We better go back to the arena... You still need to avenge Ochaco and I," Setsuna noted.

"Right," Izuku grinned, getting up and getting dressed. "I already have a plan for how I'm going to overcome her win condition."

"Good," she nodded once they had their clothes back on, and they exited the restroom.