Aizawa is paranoid, but eventually agrees to let them spend some time together unmonitored.

"She's not going to hurt me, kero." Apparently, Aizawa was slated to become Tsuyu's teacher, in a few more months. They'd never met before today, but he knew of her from the exams and had introduced himself when she arrived.

"If anything happens, I'll shout. You can be right outside, kero. Please..." Midoriya wasn't sure if she just didn't want Aizawa watching her constantly while they celebrated, or if she wanted Izuku herself to get a break from being under surveillance, but either way, it was appreciated.

"Fine." Aizawa sighed. "Because I know you're asking this without any influence from her right now, and she's been cooperative, I'll agree to turn off the cameras in the cabin and let you celebrate in peace. But the tracker and the outside ones will stay on, so no thinking about trying to sneak off anywhere."

As Aizawa left the room, and the lights on the cameras went dead, Midoriya smiled. She turned back toward Tsuyu with a grin, "Thanks for that, It's been weird having no pr...uh..."

Izuku had actually jerked off four times this morning to make sure nothing weird would happen while Tsuyu was around, but the expression on her face brought her erection back to full hardness in an instant. "Midoriya-chan, I..."

She moved forward and knelt, pulling down midoriyas pants and panties and engulfing her cock in her mouth again.

Midoriya groaned. Tsuyu pulled back, her tongue jacking her cock on it's own even when out of her mouth. "...I've been thinking about this for weeks, kero. I can't get you out of my head. Merry Christmas, Kero."

She shimmied out of her clothes, unbuttoning her top and soon was completely nude and blushing furiously. "Your present is me, kero."

This was all not remotely what Midoriya expected tonight. Certainly not this fast.

Her tongue continued to work it's magic, and Izuku groaned again as it pulled her back into Tsuyu's wet mouth.

This time she lasted much longer than at the hospital, but Tsuyu was GOOD. Anyone, much less a virgin, would pop within a minute wrapped in that tongue.

And Izuku did, but this time, Tsuyu didn't even slow down. She milked every drop of cum Izuku gave, then kept going. Rather than going soft, like the first time, Midoriya got even harder.

Tsuyu finally pulled away after another half minute of sucking, and guided her to the couch. "Are...are you ok with this? I'm sorry, kero, I just..."

Midoriya nodded vigorously, wide-eyed. "Of c-course, I'm just...surprised why you'd..."

Tsuyu cut her off with a kiss and pushed her softly onto her back on the couch. Her cock throbbed as Tsuyu rubbed her dripping slit against it, and then sank onto it. Both of them moaned, and for a moment Izuku worried about Aizawa hearing, but it had apparently not been loud enough, thankfully.

She was in heaven. It wasn't quite the same as Tsuyu's gifted tongue, but much more...snug. She began to thrust, and Tsuyu bounced in time, and soon they had a rhythm going. "I...Tsuyu-chan I'm going to..."

Midoriya tried to pull out but with Tsuyu on top, that was already difficult...but her intentional thrusting of her hips made it all but impossible. She drove Izuku's cock deep, and she came hard, but Tsuyu wasn't done, continuing to hump and hump as she rode Izuku through another orgasm, before finally she felt the pussy she was wrapped in clench as wave after wave of orgasm crashed over the adorable frog girl.

When she regained her senses and looked up at her new lover, she paused, and smiled.

Then her eyes widened.

Tsuyu noticed, and her own eyes widened in response. "W-what is it Midoriya-chan? Is something wrong?"

"Y-you..." Midoriya wasn't sure how to explain. The change was subtle. Tsuyu still looked like Tsuyu, but there were two major changes, and several smaller ones. Her face had slightly changed structure, but the main one was her tongue.

It looked like she didn't need an explanation yet, as she'd started noticing herself, her tongue instinctively trying to do...something, Midoriya couldn't tell what, and failing, as a human tongue emerged instead, perhaps longer than average, but nothing compared to before, nor as prehensile. If Izuku had to guess...her quirk was gone.

Tsuyu leapt off her, stumbling and falling in her attempt, even knocking over an end table, no longer able to leap the way she was used to. She didn't seem hurt, physically, but was clearly trying not to panic.

She scrambled into the bathroom and looked in his mirror.

"No, no, no...I don't...I..."

Izuku was horrified, not sure yet what this actually meant, but

instinctively wanted to help her as she walked up behind the distraught girl.

And a moment later, even as Izuku heard the door slam open, she was hit by a wave of relief as she felt like something clicked between the true of them, and Tsuyu's features visibly shifted back to normal in front of her.

Tsuyu looked even more relieved, but a moment later Izuku felt herself being wrapped up by strange bandages from behind.

Nearly two hours later, they had more or less pieced together what happened. Tsuyu had calmed down once her quirk returned to normal, and Aizawa went from confrontational to cautious and investigative.

They discovered that Izuku could now imitate Tsuyu's quirk at will, as well as take it away from her and give it back. She couldn't change Tsuyu's of her own quirks while Aizawa was suppressing her, but the changes did maintain while suppressing. Tsuyu was considerably less distraught with their testing, knowing that her quirk wasn't gone permanently.

Aizawa on the other hand, looked closer and closer to a breakdown with every new discovery.

Midoriya couldn't really blame him...the ability to not only copy quirks but also to remove them was frankly, terrifying. Not to mention the fact that he'd had to restrain a half naked futanari while his naked future student had a panic attack nearby.

"So...um.." Midoriya started. "Now that we know...What happens to me now?"