Archive of Our Own

Chapter Text

Ever since she had died and been resurrected by one Izuku Midoriya, Himiko had lived her life in a haze. Her thoughts had always seemed slightly disjointed and erratic. Most of those thoughts centered around her master.

That was, until she was ten.

-~-

Towards the end of the first month since her rebirth, Izuku's father had broke a deal with Nezu, principal of UA high. This deal led to them training with the rat himself as well as a hero that she hadn't recognized, but Izuku clearly loved.

It wasn't really a surprise that she didn't know them though, considering she never cared much about heroes and, even if she did, the man was an undergrounder and wouldn't be recognized by many hardcore fans anyway.

It was a Saturday. Under normal circumstances, she and Izuku would be training today, but they had good reason to skip it, alongside permission to do so.

It was Himiko's birthday after all.

When Inko had originally asked her, she had been hesitant to share her date of birth since it would make it easier for her identity to be discovered if they chose to. That hesitation was immediately erased by force when Izuku looked over, interested. The constant brainwashing responded to the unconscious desire of it's master to make her talk.

That led to the current celebration with Izuku and her sitting around their dinner table, both said table and the room at large covered in birthday themed decorations. A large balloon ten served to entertain Himiko as she waited for Inko to bring in food. She wasn't particularly excited for it since food was tasteless to her ever since she came back.

Her excitement swelled when she noticed the wine glasses brought in beside the cake. Her love of blood had not been affected by the alterations that made food and drink useless to her, so it was probably to be expected.

Each glass would look the same to a normal person, but her senses were better trained for this than a normal human, so she could tell each glass belonged to a different person. She could recognize the by now familiar smells of Izuku and Inko, but the remaining three were a mystery.

Over the next two hours, the vampire received a couple gifts from Inko in the form of clothes and a cute photo of her and Izuku together. Then, she had brought out gifts from Aizawa and Nezu. The two couldn't make it with their own responsibilities, but they still left a little something.

Aizawa had gifted her a cute black bodysuit. It seemed like it would be great for underground work, much like his own. Her favorite part was the special containers for gathered blood and the slot to place Nezu's gift on it's arm.

Nezu had gifted her what appeared to be a lightweight gauntlet. It had come with instructions, so she tried aiming it at a wall as she pressed a button on it. Immediately, a syringe shot out with a cord attached to it, sticking into the wall. After pressing another button on the gauntlet, it reeled itself back into the gauntlet. Nezu had also been responsible for the three myself glasses, containing blood from Aizawa, as well as two of his employees, Ectoplasm and Midnight.

She was going to love these gifts when she got to use them on some living targets.

-~-

After the celebration ended, her and Izuku went to their joint room. She had realized that Izuku seemed nervous about something, that something becoming apparent when he took a small, fancy looking box out of the closet.

She gave him a manic grin as she cradled the box with a gentleness that didn't match her facial expression. It would be rude to say so aloud, but she cared way more about Izuku then the others, likely because of the brainwashing, so she was excited for this a lot.

"In training, you seem to love these. I figured that everyone else wouldn't approve of it, so I needed to keep it hidden."

It was a knife, although calling it a knife was a disservice to it. It was like calling a banquet a light snack. Her normal knives, at least the ones that hadn't been confiscated because of her age, were very poor quality. They were all purchased for only a couple thousand yen at most, and weren't even that sharp.

This knife looked to be worth at least a hundred thousand yen, and was clearly custom made. She had no clue how Izuku had even got his hands on it (it was Hisashi, he wasn't the most responsible father), but she was certainly grateful.

She ran her thumb over the ridiculously sharp red line that ran up the edge of the blade. It cut into her flesh and added a little extra red to the blade before the wound healed. The handle was a deep black and seemed to be made of some expensive wood that she didn't recognize. Attached to it was a almost blindingly white blade, only broken up by the bright red line that ran up the edge of it.

To a normal person, they may have thought it nothing more than a cool knife and been done with it. To Himiko, she couldn't help but glomp the boy as she smiled widely.

"I, um, take it you like it? I had planned another gift but I don't know if it'll be possible, so I got this so that you are guaranteed to get something."

"Thank you, Izu! I love it!" Now she just had to make sure that Inko didn't see it. She wouldn't permanently confiscate something so precious to her, but she could certainly limit her access. It was probably the responsible decision, but that was hardly a concern to her. She eventually released him after thinking about the rest of what he said. "What was the other gift?"

Well, you know how we talked about the brainwashing aspect of my quirk, and I said that I would do everything I can to release it?" She gave a nod. "I think I've figured it out. I don't know how hard it will be, or if I'll make any progress at all, but I think I know what to do."

After a brief explanation, they held hands as Izuku seemed to meditate. He has explained that since his quirk was part of him, he should be able to try to force it to bend to his whim as long as he had skin contact with her. Apparently, he had already tried it once. He described it as playing tug of war with his quirk. By expelling a lot of effort, he could tug the brainwashing away just a little bit, and slowly chip away at it over time.

The only issue was how tiring it was. By the time he had dispelled maybe 5% of the brainwashing, he had passed out from exhaustion.

It was going to be slow, but for the first time in the year since she became undead, the haze lifted slightly.

Chapter Text

2 days later was their first day back at school since Himiko's birthday. Well, it was Izuku's first day back, Himiko had to be absorbed into him as per usual.

Usually, when trapped inside the strange black void that was Izuku's storage, she would find herself immediately being compelled to sleep. For whatever reason though, she had found that she could just barely hold onto consciousness this time.

Perhaps it was because of Izuku managing to lift the brainwashing slightly? Regardless, she was awake, even if she felt incredibly drowsy. She appeared to be in a black void with nothing in it but a single chair facing a large screen. The chair looked to be made of stone except for a blood red carving in it reading "Himiko Toga". That was enough to send a bolt of fear through her. Nobody should know her name anymore, only her parents and herself.

Does that mean that she created this place, or her mind? Sitting in the chair, she found it surprisingly comfortable. It seemed to be tailor made for her, and didn't even feel like stone despite it's appearance. The screen clicked on as she took a seat, giving her quite the view. It showed what appeared to be a first person perspective of a young boy taking his shirt off. The boy seemed almost familiar to Himiko though.

A green bit of curly hair dropped onto the screen only to be brushed aside by a pale hand.

'Oh! It's Izuku.'

All she could do was watch as her master got changed, not that she was complaining. She had been having some embarrassing thoughts lately, which Inko had explained to her, and this seemed like a prime time to engage in them since, as far as she was aware, Izuku couldn't tell she was watching.

-~-

Izuku was changing for gym and had just taken off his shirt. His hair was displaced by his shirt sliding up it, and fell into his face. He brushed it aside with an annoyed huff before he looked back at his chest.

A warm, embarrassing sensation seemed to stir within his mind at seeing his chest for some reason. He couldn't pinpoint exactly what it was, too young to recognize arousal. Still, it was strange to feel it looking at his own chest.

Ignoring it, he put on his shirt and went to go do his gym class.

-~-

After watching Izuku change back into his normal school uniform after gym, Himiko let the tiredness claim her. It had been difficult to keep her eyes open with that invasive tiredness beckoning her to sleep. She had been able to just barely fight it when she was offered a nice view as a reward, but watching Izuku sit through boring classes wasn't good enough for her to muster effort into.

When the greenete had returned home, he summoned her back into the world. She stretched and let out a yawn, before turning around to face her master. Her face twisted into a wide grin as a heat spread through her at the memory of what she saw.

Unfortunately, Izuku was still looking right at her, and noticed this. "What's that look for? I don't think anything's happening that would illicit that kind of reaction." She tried to resist, she really did, but the brainwashing was still too strong to lie to her master.

Once she was done explaining the day's events to the boy, he had devolved into a catatonic state, the only visible emotion being his face as red as the liquid that Himiko so craved. Eventually, he took a deep breath to calm himself and addressed her.

"Himi, next time that your watching through my eyes, close your eyes when I'm getting changed please."

"What? But why?" She whined, only to realize something. She was arguing back. She could actually argue back! Izuku seemed to have come to the same conclusion by his shocked expression, before they both burst into smiles.

"I'm not comfortable with you watching me change. Would you be comfortable with me watching *you* change?" He tried to focus back on the conversation at hand.

"Yes! You can watch me change whenever you want, Izuku!"

He blushed at that. "You're only saying that because I haven't got rid of all the brainwashing just yet. You don't actually think that."

Himiko could sort of identify what thoughts were her own by this point, and she was pretty sure that was one of them. Saying that may cause her master to have a heart attack though, so she held off.

"Himi, please. I don't want to have to force you to close your eyes, because I'm uncomfortable ordering you around, but I'll make an exception if you try to do this." Despite her pout, he seemed to be set on this.

She sighed. "Fine."

-~-

From there, she slowly but surely got better at staying awake in storage. It was also helping that as Izuku whittled away at the brainwashing one percent at a time, it slowly became less and less tiring to stay awake.

This came with a realization alongside it. They appeared to be sharing sensations. Izuku had described feeling random emotions throughout the day, such as an intense rage at Bakugo. He didn't particularly like him, sure, but he usually ignored him. Himiko disagreed, which caused her rage and annoyance to spread into Izuku.

Unfortunately, there didn't really seem to be a solution for this. They had experimented for a bit, but even trying to hold back didn't seem to stop her feelings from reaching him. On his end, he could also communicate back, sharing his thoughts and feelings with her if he so wished.

Himiko loved it. Her favorite thing has for a while been using her quirk to become other people. This was even better when it was people she cared about like Izuku and Inko. This was somehow even better, allowing her to not just look like someone, but fuse into them. It was almost erotic to her, much to Izuku's embarrassment since he could feel her lust in his head.

Even better from her perspective, the communication between them was only growing. As the brainwashing faded and could serve as less and less of a solid wall between them, they started to be able to even talk to each other sometimes. Izuku had theorized that with the brainwashing vanquished eventually, they may even be able to communicate telepathically.

She had never cared much before, likely because of the brainwashing, but she was now excited for the brainwashing to be gone.

Chapter Text

From that day when they discovered they could meld together, they had messed with it thoroughly. It was these experiments that led to a new use of their link.

They were still at UA, they had already finished their training for today, but Nezu had given them permission to stay and continue messing with it. Right now, they were trying to figure out how to make it stop. Himiko was in Izuku's head as he sat in Nezu's chair, which had become a permanent fixture of this courtyard.

"Are you feeling this?" Himiko asked through their shared minds, thinking of happy thoughts to see if it would spread to Izuku. At the same time, she actively concentrated on not letting her feelings through. "Yeah, happiness, right?". This clearly wasn't working. Once the connection was known by both, they were at least able to talk while fused, but it wasn't easy. She felt just fine with her inability to exhaust, but she could feel tiredness emanating from the other half of their shared mind. "Do you want to wrap it up for today? I can feel you're tired, and we don't seem to be getting anywhere." Izuku didn't respond verbally, instead dragging her out of his mind and placing her a couple of feet away from him, his current maximum reach on that. She walked over and plopped down on Nezu's desk in front of him. The boy must be extra tired to not even notice the view down her skirt that the position provided. He was 13 now, after all. "I just don't get it. There must be a way to separate our minds somehow, but it refuses. Is this my quirk's way of punishing me for fighting its control on you?"

That certainly wouldn't surprise her. The last three years of his fighting the brainwashing every single week had proved beyond a shadow of a doubt that his quirk was as stubborn as he was. If she estimated, she would say she's at about 25% brainwashing? It would be in character for it. "I mean, is it even a problem? We only share minds when I sit in the chair, and that's only when I'm watching. Plus, when we're at UA, when will I not be summoned?" Izuku stroked his chin in thought. "Maybe, but it's just frustrating. It feels like my quirk fights me on every single thing I want to do." She tried not to giggle at his angry expression that didn't match his face. 'I can just feel the frustration oozing out of him.'

'Wait, I *can* feel the frustration oozing from him. Does that mean?' To test her theory, she grinned manically and played with her skirt, drawing the boy's attention to it and the fact that he had missed it earlier. He seemed to freeze as he became tomato red, not that Himiko needed to see his face. She could feel pure embarrassment spilling out of him and into her just as she could when they were one. "Wh-what are you doing!?" She closed her legs with a light giggle. "Perv. Anyway, I realized something: I was just testing it." Before he could even ask what, she thought again about the arousal that filled her watching Izuku look down her skirt, and watched as the boy reached the same conclusion she just did. "Fuck, do we have to worry about this even unsplit now?" Himiko shook her head. "I don't think so. If we did, why would we not have noticed it the past three years? It's been a while since we gained the ability to fuse." The bushy-haired boy stood up and started pacing. "Then what changed? What is different now than all the times before?"

She pondered much the same question. It had activated three times between them, unsplit anyway, and had gone both ways. The first was frustration, then embarrassment, then arousal. The first was accidental, but on the other two, she actively thought about either reading his feelings or sending her own. 'Come to think of it, didn't I think of it the first time too? I thought about how I can practically sense his anger.' In that case, "We definitely shouldn't have to worry about it. Every time, I've either wanted my feelings to reach you or wanted yours to reach me. It doesn't seem to happen by accident." A look of concentration appeared on Izuku's face, and she felt his relief permeate her, which she nodded at to show she received, only strengthening the sense of relief.

-~-

It was the night of that same day, and Himiko had retreated into Izuku's mind as he slept. She had told him that she preferred to sleep in his mind since it was easier to do so, which was true; she couldn't lie to him, but she had left a little bit out. She was basking in the feeling of being one, lying in what would normally be a chair, but she had discovered it would change shape to a bed if she wanted it to.

'There's nothing quite like this. To feel his thoughts and feelings wash through me, to witness all of his desires.' She shuddered in pleasure. A dream played in her head, which she happily listened to. 'I can't even describe it. The comfort of our minds being one, it's like our brains are in a nice warm hug. I just want to melt into him and either take his very essence into myself, or let him do it to me.' She let one of her hands drift down her body, and the feeling spread to Izuku, causing his dream to become much more lewd. 'If having our minds become one feels this good, how good would our bodies becoming one feel?' She let such thoughts guide her hand for a while before she let herself sleep.