Author's Note: Should I have mentioned this fic originally started on Ao3? I have no idea what I'm doing on this website.

"Okay, so proportionate to the amount of blood you drink, you can transform into someone. Do you have any exact figures, like a milliliter is equal to a minute?"

"Um, I'm not really sure. I haven't had many opportunities to test my quirk."

Midoriya sighed. "That makes sense, I suppose. Well, let's just work with what we've got, okay?"

Toga nodded. She wasn't quite sure how she had gotten in this situation, sitting across Midoriya in his living room like she was having a consultation. She wasn't opposed to the idea, in fact she was still just surprised that he didn't immediately start hating her after hearing her quirk. Not to mention that he even seemed excited by it. This whole situation was extremely unusual for her, but she wasn't complaining.

"So, how exact is the transformation? All aspects, like voice, hair, and so on?"

"It's an exact transformation of every detail of their body, as far as I'm aware. Oh, I can also copy their clothes, but I need to get naked to do that." She grinned as she watched his pencil freeze. He looked up at her, red spreading across his face, before he quickly averted his eyes again. He really was pretty cute.

"W-Why is that?" He managed to squeak out.

"Well, if I'm wearing my clothes, then when I transform, I'll still just be wearing my clothes. If I'm naked, I copy their clothes."

"Interesting." Izuku tapped his pencil against the notebook. "Is it whatever clothes the person is currently wearing, or what clothes you know they wear?"

Toga cocked her head to the side. "What do you mean by that?"

"Sorry, that probably wasn't very clear. What I mean is, when you copy someone's clothes, are they whatever clothes they're wearing the moment you drink their blood, or just what clothes they had on when you took the blood?"

"Um…" Toga was having a hard time really understanding what he was saying, but she thought she got the gist. "I guess I'm not sure? I mean, I always thought it was whatever clothes they were wearing at the time, but I've never thought of seeing what would happen if they changed their clothes after I took it."

"Something to add to our list of experiments. Because that distinction could actually be really important."

"How so?" Toga couldn't possibly understand what he was trying to say.

"I would normally think that being able to copy clothes when your quirk works through blood ingestion to be quite strange. I would assume that it works through DNA or something like that, which is another thing we need to check; to see if your DNA also changes when you transform." After writing that down, Midoriya shook his head. "Anyway, being able to copy clothing implies a possible different aspect to the quirk than just genetics, because obviously clothes wouldn't follow the rest of the transformation in that case. That means it's likely also perception or understanding based, so I just want to confirm how that aspect works. If the quirk is based on both, that allows for a lot of different possibilities."

Toga didn't even pretend to understand all of that, but it seemed that Midoriya wasn't elaborating, and instead moving on. She figured he'd explain more to her later if she asked. She just loved something about the way he spoke about quirks. He seemed to really love talking about this stuff. His passion was obvious in his tone and his face. She could listen to him talk like this all day.

"What have you found out?"

"Unfortunately, not much. Toga Dai and Toga Kamiko are, by all accounts, normal people. There's no reported history of violence or abuse."

"Well that just means that we need to find the evidence."

"I do believe a visit to their residence is in order."

"I can't believe I didn't ask this question before. Are you able to use the quirks of the people you transform into?" Midoriya looked at her pensively.

"No, I don't think so. Well, probably not."

Midoriya squinted at her. "Why do you say it like that?"

Toga shrugged. "I've never tried. I can't imagine doing it, but I'm not sure."

Midoriya hummed thoughtfully as he wrote his notebook. How much of that thing had he filled up already? After finishing whatever sentence he was on, he set his notebook down and stretched. "Well, I have more questions, but that's probably enough for right now. So, why don't we try a few experiments instead? We can't do too many with only me, but we can definitely do a few important ones."

"Experiments?" Toga was confused. She had heard him mutter experiments a few times when he was writing but she didn't really pay any attention to it.

"Yeah. I mean, don't you want to understand how your quirk works? Or at least, get a much better understanding of it." Not waiting for her answer, he walked into the bathroom. A few minutes later, he walked out, a syringe in his hand. She did a double take when she saw there was already red liquid inside of it.

"Did you… Did you just draw blood?" What the hell?

"Well, you need blood for your quirk and I don't just have blood lying around. I have a bunch of different medical supplies for pretty much any scenario."

"That's not what I meant." For someone so smart, he could be pretty dumb sometimes. "I meant, why are you doing this for me? Why would you bleed for me?"

"You make it sound super noble when you put it like that." Midoriya scratched the back of his head. It seemed to be a nervous tick of his. "But really, I'm just super interested in your quirk and I want to help you learn about it."

He still didn't seem to understand what she was getting at, but she decided to let it go. This was just how he was, Toga realized. It still baffled her how someone like him existed, but she was starting to accept it.

"Thanks, Izuku."

He spluttered, almost dropping the syringe. "Um, it's fine… Himiko?" She grinned.

Izuku sighed, handing her the needle, and after hesitating for a second, Himiko took it. She pushed the plunger and dripped a small bit of it into her mouth. As the metallic sensation spread throughout her mouth, she felt a blush rise to her face. This was Izuku's blood she was drinking. It tasted better than any other blood she'd ever had.

Izuku grabbed his notebook again and documented the process of the way she transformed.

"That's awesome!" She heard him exclaim after he was finished. "It really does look exactly like me."

"Well, yeah, that's kinda the point." Himiko smiled, but suppressed an urge to wince. What was that? She felt a sort of ache in her right arm and legs. Nothing terribly painful, but a tightness in her limbs.

"The voice is spot on too. Okay, roll back your sleeves."

She was confused, but complied anyway, trusting him to know what he was doing. What she wasn't expecting though, was the crooked scars covering his right arm.

"Okay, so it's not just visual information, it is an actual one-to-one of the person's body, even if you don't know what the part looks like." He scrawled down his observation, but Himiko was barely even paying any attention.

"What is this?" She asked in a low voice.

"Hmm?" Izuku looked up at her, seeing her still staring at the scars on his (her?) arms. "Oh, well I wanted to see if your quirk actually replicated a person's body structure or just what you imagined it to be. Clearly it's a fully accurate transformation, which is interesting especially considering-"

"No." Izuku froze at the dangerous tone Himiko was using. "Why do you have these scars? Who gave them to you?" She glared directly into his eyes, her yellow pupils boring holes into him.

"Oh, don't worry about it, please." Izuku knew he had to do his best to defuse the situation. "That's just from my quirk. It's super hard for me to control, so I end up breaking my bones when I use it. That scar is mine, so don't worry about it."

Himiko was silent for a few seconds. "That scar?" Izuku paled. He messed up. "Does that mean you have others that aren't from you?"

The silence after that stretched on. Without warning, Himiko started taking her shirt off. "Hey, don't…" Izuku weakly protested, but Himiko didn't pay him any attention.

Izuku was acutely aware of how bizarre it was for him to see himself in a bra, but the seriousness of the situation prevented him from laughing at the awkwardness. She quickly unclasped it anyway, and soon Izuku was staring at himself, completely topless. It would have been embarrassing if not for the waves of rage emanating off of Himiko as she glared down at her body. There was a plethora of burn scars that were in various stages of fading. He was thankful that Bakugo hadn't been quite as cruel these past few months, so there weren't any fresh burns. But he didn't think telling Himiko would alleviate any of her anger.

"Izuku," Her voice was quiet, barely above a whisper. "Who do I need to stab?"