Little sister

Walking back inside the monitor room Shun looked at his classmates who were rewatching the battle he fought just now.

Noticing the gate's opening, all of them turned around and saw their class president that defeated three teachers without much difficulty walking in.

"That was amazing Shun!" said Tokoyami as Dark Shadow came out and gave a thumbs up.

Shun nodded and then bent down and picked up Eri who came running towards him.

"Onii-chan, you are not hurt, right?" asked Eri with worry. She saw Shun getting attacked by multiple concrete constructs and was worried that Shun might be injured because of that.

'...Worrying about me?'

Shun dematerialized his armor and appeared in his vibranium bodysuit.

"I am fine Eri, but thanks for worrying about me."

Eri stared at Shun for a while wanting to know if what he said was true or not.

Shun just ignored that and looked at his classmates and Chiyo.

"I held back the best I could, though the three of them might still be injured. Do heal them," said Shun as he turned around and started walking away.

"Where are you going?" asked Chiyo.

"Home. The exam's over right? Bye-bye." said Shun as he just used customize create to change his suit to his uniform and went away with Eri.

"Bye, Grandma!" said Eri as she waved at Chiyo and then looked back at Shun who was carrying her.

"You were very cool Onii-chan!" said Eri with a smile.

"Really, then I guess it was worth putting on a show," said Shun.

"Show?" asked Eri as she cutely tilted her head.

"Yeah, I could have passed in an instant you know. I put on a show so that people don't think that I am overly strong," replied Shun.

"But why? Is being strong bad?"

"It's not bad Eri, being strong is important so that one can protect themselves. But if others start to think that you are too strong or your power is too great....troubles can happen," said Shun as he tapped on Eri's forehead horn.

Eri touched her horn and then realized what Shun meant. She remembered the days when the bad people experimented on her. All the time she was hurt because of her quirk.

She clutched Shun's clothes tightly and felt angry and scared.

Realizing the look on her face Shun patted her back.

"Don't worry, I will protect you to the best of my ability. But you need to get strong as well Eri. Take it from someone well aware of society, being weak is not an option." said Shun as he patted the kid's back.

He knew that she was very young, but the villains were not going to consider that. He can keep her safe but that was not possible at all times, she needs to build her strength slowly.

Shun entered his class and picked up his belonging before he put Eri on the table and looked directly at her.

"So what do you say Eri, want to train your quirk and become strong?" asked Shun as he tapped on her horn once again.

From what he learned after checking her body, some sort of energy is stored in her horn which let her use the rewind quirk of hers.

"B-But what if something bad happens to you?" asked Eri.

"You sure can worry about someone who is obviously way stronger than you. Still, it doesn't feel bad," said Shun with a smile as he ruffled her head.

"As for something bad happening to me, well don't worry, I can take care of myself," said Shun as he used his quirk and absorbed all the energy inside the horn making it small.

Eri widened her eyes in surprise and touched her forehead to check if her horn was small or not.

"Your quirk and my quirk are quite compatible, so don't worry about hurting me, though I cannot say the same about others," said Shun as he touched her horn once again and put energy into it, making it big once again.

Eri touched her horn and felt how big it got. She looked at Shun with twinkling eyes and higher him tightly.

"Why the sudden display of affection?" asked Shun.

"I like you onii-chan! You are the best!" said Eri.

Shun didn't know why but hearing her praise made him feel ecstatic. He smiled and absorbed the energy out of the horn and then lifted her once again.

"So Eri, want to get stronger and face your quirk?" asked Shun.

Eri looked at Shun with a smile and nodded her head.

"But you will train me, only then!" said Eri.

"Okay, but why me specifically?" asked Shun. He didn't have a problem with that since he was planning to do so anyway.

"Yay! You will spend more time with me this way!" explained Eri.

"Is that so...good for you then. Just don't forget that I won't be lenient in training," said Shun with a smile as he formed a fist and moved it in front of her.

Eri smiled and fist-bumped Shun as the two of them smiled.

Later that night inside Shun's home, Shun, Eri, Chiyo, and Sorahiko were gathered.

"So, you are planning to take in Eri-chan in the family?" asked Sorahiko.

Shun nodded as Eri looked at the three of them who were present in the room beside her with an expectant gaze.

No one was against the idea of taking in Eri. She was a cute and obedient kid that got along with all of them.

"Well, if you want to then go ahead. I and Chiyo don't mind. But you have to make sure to be responsible for her. Treat her well, like a sibling. Protect her. Teach her to be a good person." said Sorahiko.

"Don't worry, I will grill all my teachings into her," said Shun as he looked at Eri.

Eri nodded with a determined look on her face and said, "I will learn everything from Shun Onii-chan and become strong."

Chiyo and Sorahiko smiled at the child who was about to become their granddaughter.

"So, what will your last name be Eri-chan? Shuzenji as in Chiyo's name or Torino like mine, just so you know mine sounds cooler," said Sorahiko with a smirk.

This earned him a smack from Chiyo.

"U-Um.....K-Kazami..." said Eri shyly as she glanced at Shun.

Hearing her answer Shun blinked in surprise but soon looked at Sorahiko and smirked.

"Heh, looks like Eri, don't find you cool enough," said Shun.

"You! It's cool!! You kids just don't understand!!" said Sorahiko.

"Whatever old man....so then Eri, let's get along as siblings," said Shun as he moved his hand forward.

Eri nodded and then shook hands with Shun bit soon tears appeared in her eyes that started dripping off her cheeks.

She immediately jumped on Shum and hugged him right like a koala and started sobbing.

"Thank you, thanks a lot Onii-chan."

Shun just patted her back and let her be.

The two remaining people just looked at their grandchildren with smiles on their faces and just like that the day got over.

They decided to let Chiyo be the one to adopt her since Shun was already quite famous after the sports festival and there might be some people who might be snooping around his records. Since Chiyo and he were not related on records it was safer for Eri to be adopted by her, not to mention Chiyo was quite famous and had quite a bit of power in the health care department of Japan, meaning she had quite a bit of connection which can let her adopt the girl without any issue.

All this didn't matter to Eri though, she was just happy to have a family now. She knew that they loved them and she loved all of them back.

Shun just looked at the three people who were in the room and then focused on his newest family member.

'...Gotta ask Miyuki some tricks about handling little sisters, I guess. A new issue.... though I am not that bothered about it.' thought Shun as he just patted the girl's head once again before he started preparing dinner along with Chiyo.