Touya's fire went out instantly after Eri's quirk did.

Then, he barely had time to catch her and lay her on the ground before Tamao came running out the house.

"Dabi! Eri-chan! What…"

The woman trailed off and stared at him with her eye wide open.

"Kid's fine. Just a little crisis, nothing to worry about."

Sure, she'd be sick for a while like last time and he wasn't completely positive he hadn't left some burns in the few seconds he had held her, but it wasn't like he had beaten her unconscious during their training like—

"Not even about your rejuvenation?" Tamao asked, pointing at his now much looser clothes in concern.

That was enough to break his previous train of thought and send Touya in a panic again.

He rushed inside the house, straight to the bathroom and ignoring the woman's yell to cover himself.

He wasn't listening.

Because, even though his quirk had been able to stop Eri's…

He hadn't been using it all the time.

Which meant he was younger now.

And, if he was younger enough, then Todoroki Touya would be…

Staring at me from the mirror.

He looked like when he woke up from his coma: the burns were mostly gone, but the parts where the skin grafts connected to each other were very noticeable.

Still healing, he reminded himself as he ran his fingers along the marks.

They never got to heal.

With his training, he ended up burning himself again and replacing the stitches with staples.

It didn't look like he had stitches either, though.

"Dabi, are you okay?"

No! No, I'm not. It's too soon for this!

He doubted anyone in this house would recognize him as Endeavor's eldest son, but he couldn't take risks.

He lit his fire where his scars used to be, yet he put it out as soon as he saw it.

The flame came out orange.

Did I lose all my progress too? All that training was for nothing?

He hated the kid so much right now.

But he hated his own stupidity too.

She had a very very good reason to be scared of her quirk: it could ruin someone's life even if they still lived.

And yet you were too careless in handling her and her quirk.

He hit the mirror on impulse.

It didn't break.

His hand didn't hurt, but he was sure it'll bruise.

Bloody tears fell on the sink.

Pathetic! You are as weak as back then too.

"Dabi, open the door!"

"SHUT UP!"

His own teenager voice was what broke Touya.

To hell with everything!

He shot flames at the door, burning it down and revealing a surprised Duster.

Then, a wave of exhaustion hit him so hard he blacked out.

He woke up in his bed and, giving a quick glance around, he saw the old man sitting between his bed and Eri's.

The kid was sleeping with a wet towel on her forehead, which Duster must have been changing. Although her face was reddened, she seemed to be dealing with the aftermath of quirk overuse much better than the first time.

"I see you are feeling better", the man greeted upon seeing him awake.

"What makes you think that?"

His own voice irritated him so much he would burn his throat if he didn't need it to tell the world the truth about Endeavor and laugh in his face.

"You aren't trying to burn anything."

Touya let out a dry laugh. If only this guy could read his mind…

"By the way, I sent Tamao to get you some clothes."

He hummed, "So, you didn't want her here in case I was still unstable."

"She is my little girl," the old man shrugged.

The smile on his face when he said it made the now teenager feel like he'd been punched in the stomach. He looked away, rolling to fully give him and Eri his back.

"Well, don't worry. I'll be out of your back as soon as I have some clothes."

"Why for, boy?"

The fire user raised an eyebrow at that. Wasn't it obvious?

"For starters, I tried to burn your house and you all."

"You only burned the bathroom door," he chuckled. " 'Sides, you wouldn't have gotten farther than that."

He knew Duster was just teasing him, joking around, but the comment made him clench his jaw.

"That too."

Touya sighed, hesitating.

"What's wrong?" the man asked, putting a hand on Touya's shoulder that he quickly shook off.

His throat felt dry, but he had to tell him. He owed the vigilante an honest explanation at least, as an apology for not living up to what he expected of him.

The story repeats itself once again, he thought bitterly.

"I'm weak as shit now. You've got no use for me anymore."

Well, maybe not 'anymore', but it would take ages for his quirk to go back to what it was.

Hopefully, he would still be able to fulfill his revenge.

Because if I can't, then…

"I'll be the judge of that," Duster replied, inadvertently stopping him from spiraling.

The old man sounded serious, but not mad or disappointed.

I don't get it.

"What do you mean? I can't be a vigilante like this."

"Sure you can. We just have to take it easy for a while."

He huffed in frustration, "How is that an option? By the time I have my blue flames again the guy we were after may have already been captured."

"Y'know, you could get to that level sooner if you had a trainer."

Oh, so that was it. He thought this was the perfect chance to become his mentor.

However, Touya couldn't make sense of his insistence.

Why does he still want me around?

What is so important that makes him want me as an asset so bad?

He had to figure it out.

"We'll see about 'trainer', but we can train together," he conceded. "You can be my training dummy."

He turned around just to show the old man his mean smirk. As expected, he laughed it out.

"I can work with that," he said before going to change Eri's towel. "I can help with her training too."

"No!"

He surprised himself with how loud that yell was, but he pretended it didn't put him off by glaring at the vigilante.

"I don't want you to train me, so what makes you think I'll let you train her?"

"That's up to her, don't you think?"

"No, she is a kid. My kid. I decide on the training."

"She is your kid?" he asked, perplexed.

And, while Touya didn't mean it like that, he would play along to avoid more of Duster's meddling.

"She's my sister," Touya lied, making a show of massaging his eyes. "So keep it shut."

The old man eyed him as if he was analyzing his very moment. Wasn't that believable enough? Because, with her calling him 'Oniisan', pretending to be her father would be even harder.

"What do you know 'bout the Shie Hassaikai then?"

That must be it: he had to pretend he lied before. That was why he didn't like lying, lies just generated more lies and that made it hard to keep the story straight; so, since he had no choice here, he'd have to make it as close to the truth as possible.

"Not much, I've never been involved with them. I didn't even know about Eri before I charred the beak freak and I only did that and kept her because she is a carbon copy of my mother." He felt his tongue sour at those words. "No idea how she ended up with them."

"Well, it makes sense, you seemed too old to be Overhaul's kid," Duster commented, still mulling it over in his head.

Touya hummed in confirmation and then shifted his attention to Eri. He wasn't worried about the kid denying they were related, he could just say that she didn't know and he hadn't told her yet.

Then, when he had the chance, he would convince her he was his brother.

No, that's not right.

If she did believe that, it would be safer since there was no risk of her slipping and revealing they were pretending, but something didn't sit right with him.

Quirks weren't an issue, his quirk and his real siblings' couldn't be any more different, yet Eri had turned him back into a teen. She had made him as weak as he was back then and he hated it.

Just like you wanted her to do.

So what if this was his punishment for his bad intentions? She still put him in this situation, there had to be consequences for her as well.

And he knew just how to punish her.

When Eri woke up, she frantically searched for her caretaker with her eyes.

She knew he hadn't disappeared, but she was worried nevertheless.

She had heard him talk with Duster between dreams and she was worried that he would be mad at her.

Because she damaged his quirk.

And she could tell he liked it.

She damaged something he liked.

She hurt him.

So, would he leave her?

She just found out he was her brother.

She didn't want him to leave like Mommy did.

"Wow, Eri, what's wrong?" came his voice from the door as the lights turned on.

She ran to him but stumbled on the way.

Her brother looked at her from above, expression unreadable.

He was shorter now, and the scars were gone, just some marks remaining.

They looked like cuts.

The sight made her sob.

"Oniisan! I'm so sorry, I didn't mean to do this. Please, please, don't leave," she begged.

He gave a frustrated sigh and picked her up.

"I won't lie to you, I've thought about it." Eri felt her heart fall. "However, I decided to stay on one condition."

She held tight onto him, holding her breath for his next words.

"Would you believe me if I told you I am your brother?" he asked in a secretive whisper.

She immediately nodded, "I heard you tell Duster-san, it makes me happy."

No one told her she had a brother, not even Tengu-san; actually, she wondered if Tengu-san knew, because his last words sounded like she was Grampa's only grandchild. However, any doubt she had disappeared when she saw the cuts: they were a sign he had received the same treatment.

She pulled back to touch them. He jerked his face away as soon as her fingers made contact.

"Sorry, do they hurt now?"

"No, but don't touch them," he frowned.

She muttered another sorry and went back to her previous position. Then, she asked the question that had been left in the air, fearing the answer.

"What's the condition?"

Touya clucked his tongue.

This wasn't going how he wanted. His stupid heart had become weaker too and he couldn't bring himself to do as he had planned. It was infuriating, but he'd have to delay her punishment like everything else since this happened. His only confort was that being his sister was a punishment in itself.

However, he wasn't going to pass up the chance he had.

"We'll resume your training as soon as you have enough power, and no hiding it like last time."

There was silence on her end. She hesitantly looked at his face again, eyes wet with unshed tears.

"You don't think I'm cursed?"

Her eyes flickered to the seams under his eyes for a second before she held his gaze.

"For cursed, me," he huffed, making her eyes grow in surprise and worry. "Who told you that? Daddy Dearest?"

"No, Daddy died when my quirk appeared, I…" She trailed off, scrambling to find the words. "I made him disappear, that's why Mommy left. Overhaul said she thought I was cursed like he does."

Okay, that was a lot of information.

First, sweet little Eri had an unintentional kill count; that was why she was so scared of hurting people.

Second, her mother abandoned her; hence the fear of abandonment.

And finally, Overhaul was not her father; which explained why she believed they were siblings so easily.

All that plus whatever that guy put her though made her terrified of using her quirk.

She was now crying in his arms because of it and he felt a phantom burning sensation on every inch of his skin, mostly his chest.

"Eri, you aren't cursed. Your quirk is not a curse. No quirk is," he stated, sounding less firm than he intended.

She wiped her tears, but they kept coming out. Touya resolved to sit on her bed, let her nestle on his lap and reassure her until she calmed down.

"You see, most quirks are like fire."

He lit a flame on his hand, a golden flame that he refused to look at. No, he just saw its reflection on Eri's eyes.

"It can burn you or keep you warm," he continued, "it just depends on how you use it and knowing how to control it."

"Why did Mommy say that, then?"

"Because the bigger the potential, the bigger the damage it can do and also the harder to control. People fear what they can't control."

Eri nodded at that. Yes, she had been all her life afraid of losing control of her quirk and having a repeat of what happened.

"It's not just me?" she asked, slowly managing to stop her crying.

"No, you only had some shitty people making it worse," he grumbled.

But Oniisan isn't afraid of my quirk.

He decided to stay, even after he saw what her quirk could do.

"Oniisan's so brave."

He dismissed the compliment, "Nah, I just see the good they can do is bigger too. I'm proof of that, those scars weren't supposed to heal, but you did it."

She looked at his face again, catching the moment his eyes lit up and a smile spreaded on his lips.

"Hell, I wish I had met you before."

Her lips trembled in her attempt to mirror his smile.

Have I really helped him?

"Your quirk can be a curse or a blessing. Only you can turn it one way or the other, no one else," he said, sparing a glance to his flame before putting it out. "Understood?"

She started the motion to nod but stilled when a doubt crossed his mind.

"But then, why did Oniisan say he was cursed?"

His eyes darkened again. She regretted asking.

"My quirk hurts me, you already know this," he answered dryly.

Without the scars deforming his expression, he looked sad instead of upset or like he didn't care.

But she could make him happy again, right? If she made her quirk a blessing, then she'd be able to cure his curse!

"I don't want to hurt anyone anymore, I want to help Oniisan," she declared, determined.

He chuckled a little and petted her head, filling her chest with soothing warmth.

"That's what I wanted to hear."

His smile was back too, a little lopsided.

What Eri didn't notice was the evil glint in his eyes.

He had a new plan.

Oh, Eri baby, that isn't a smile, it's a smirk.

Anyways, this chapter is the aftermath of the rewind. As you can see, Touya is like 16 but conserves all his memories of being an adult. From what I undestand, Eri's quirk affects physical states and no one she rewound seemed to have lost memories, so I'm assuming this is how it would work.

Also, if this feels fast-paced it's because they keep moving the plot points as they want.

Disclaimer: My Hero Academia and its characters are property of Kōhei Horikoshi and Studio Bones.