Ochaco and Izuku! Izuku becomes Izumi!

"Well, I gotta say, I'm up for a two for one," Denki mused, grinning. "How should we approach this?"

"Well, no need to wait for tomorrow to get Izuku Rule 63'd!" Eiko piped up. "I guarantee you, no one can turn down this amount of fun!"

"She's right, Master, once one experiences being under the spell of Sex Genie magic, even if it's not technically magic in this universe, nothing short of a complete memory wipe of it will get them unhooked," Momo giggled. "They'll usually accept any terms to remain involved from that point on. Though a few stronger willed ones might try to set some of their own, but they'd cave fast if you don't let them. But at the end of the day, they'll always get more enjoyment out of life as a result."

"Alright, is there a private place we can do this then?" Denki asked Momo, who nodded, and walked them to a locker room as he considered how to word his wish.

...

Izuku had just left Recovery Girl's office, and was about to go look for Bakugo, when he felt pleasant tingles suddenly run through his body. He paused, wondering what was going on, before he noticed his uniform had started to change. The hem of his over and undershirts were retreating upwards, and both garments tightening a bit, which, wasn't really a surprise, given his chest was expanding. Though the chest part was in itself a surprise.

Adding to his confusion, his hair was lengthening rapidly, his face softening, and his hips flared out while his waist tightened. He gasped a bit, falling to his knees, realizing his pants had turned into a skirt, and the short UA uniform skirt at that. His manhood shrunk away as his boxers also changed into panties, a lime green pair, and his crotch parted, opening up into a fully developed labia.

When it was all done, Izumi panted, now wearing the skimpy girl's uniform, and taking in the fact that she was now a girl... Wait... Izumi? She blinked at the notion of her very name having changed, and yet, it felt so natural. She slowly stood, taking stock of her situation. Had she been hit with some kind of gender swapping Quirk? And if so... Why was she so calm about it? She wasn't proud of this trait of hers, definitely not, and was slowly improving it, but she still had a tendency to panic on something of a hair trigger. Something... So drastic, should have had her a catatonic mess.

She started walking down the hall, muttering an analysis of her condition. Her gender had swapped, including her clothes, and even her name and gender identity. She was thinking of herself as a girl now, and mentally called herself Izumi instead of Izuku.

She proceeded to walk into the bathroom, and examined herself in the mirror. "...wow... I look cute," she murmured, taking a moment to admire herself, and ran her hand through her hair. It was still messy, but had a more silken feel to it now. It added to her charm.

It then clicked that she was in the girl's restroom. She hadn't even thought about which one she'd gone into, so preoccupied she had been with her own thoughts. It was like she'd been female her whole life, and had the habits to fit. "...that would be concerning, and yet, I'm not concerned, just a bit... Bewildered... Perhaps a gender swapping Quirk with a mix of hypnotic suggestion?" she muttered as she stepped out of the bathroom. She definitely had a lot of questions right now.