First, he makes the wish! Then they head to bed!

"Alright... How to word this?" Denki mused, putting a hand to his chin, putting on a somewhat comical show of thinking. Kyoka, Momo and Mina giggled a bit at him, and he pouted. "How about... I wish for Kirishima to experience a dream tonight that feels as real as reality, and where he experiences what it would be like to be a girl in the harem, exploring all the options. Any questions he has on the dream should be answered as we would answer them of course. And... In the morning, there should be a notification on his phone that explains the offer, with the options of, "forget" and "accept.""

He took a breath and continued after another moment of consideration, "Both should scrub the notification and all traces of it once one is selected, but "forget" ...well, that's self explanatory, he'll just forget the whole thing and go about his life, whereas, if he hits "accept," he'll immediately turn into a girl, and gain that as her new gender identity. Everyone else she knows should remember her that way, and all records changed accordingly. Then she comes right here. She should also have the ability to change back into male form for any time with Mina," he finally finished.

"...sounds good. Bisexual too?" Momo asked, raising her fingers to snap.

"Bisexual too," Denki nodded, and she snapped her fingers, granting the wish. Now it was just a matter of waiting for tomorrow morning.

Akemi returned, introduced herself to Mina, and after some hanging out, they all decided to sleep at Denki's place. They headed for his bedroom, and everyone who wasn't already naked, stripped down. "You're a very lucky guy, Master," Akemi teased him.

"Don't I know it?" Denki chuckled as they all climbed into bed, and drifted off.