Chapter 1: Siblings

Izumi Midoriya was crying, as her brother Rin caressed her hair "Don't cry... tears will stain your pretty face." Rin said. His has green eyes, green hair with streaks of blue.

"B-But... she hit you again and-and called you ugly names and-" She cried and Rin chuckled.

"Relax. I am used to the hag anger issues." He hugged her "Hey, remember when I promised you to see the beach?"

Izumi nodded still sobbing "Y-Yes..."

"Well; a friend got me a place close to one, and he said we can move with him." Rin said and Izumi gulped.

"But what will she-"

"Relax Sis... I have a plan." Rin calmed her "Pack your things and wait for me in our room." He said and she nodded.

She left and once she closed the door, he lost his smile and was replaced by a frown. He grabbed a small switchblade made a small cut on his wrist. Black tentacles came from the wound and started to cover his wrist and hand.

Izumi didn't have too much things. The apartment where they live is small and crampy, with only two rooms and one bathroom. In one room sleep she and her brother and the other one is for her mom and her clients.

A scream was heard and a hiss. She peeked her head out to see her brother walking out of her mom's room, with one of his arms turned, and blood on his white shirt.

"Bro?" She asked and he smiled at her.

"Are you ready?" She nodded as he grabbed from the room a backpack and a grey hoodie. Izumi had a small, old roller bag of a red color, while Rin backpack was yellow. He grabbed her hand carefully as the demon arm of her brother was fading away, reverting again to its human form, a small cut on his wrist could be seen.

They left the building and walked towards the closest train station in the shady neighborhood they lived in tokyo.

Izumi looked at Rin "Where are we going?" She asked and Rin smiled at her.

"Musutafu. A friend said we can stay with him." They said getting into the train.

Izumi pulled out her All Might plushie and hugged it. She was scared. She... didn't like her mom. She was mean and she hit them. But... Rin seemed to hurt her. She looked at Rin who was watching some messages from his phone, while still holding her hand. She smiled.

Her big brother will never hurt her.

*At Musutafu*

"Here are the keys." Rin grabbed the keys and watched his friend walk to the door "The place is yours."

Rin raised a brow "May I know why, Dabi?"

Dabi shrugged "I found a better place. Don't worry about the owner, he already knows and there are 3 months paid already."

Rin smirked "How generous of you."

"Shut it King. Just remember the deal." Dabi said closing the door.

Izumi, who was watching from the couch, still hugging her All Might plushie tilted her head. "He looks nice."

"I guess so. So, this place has three rooms, a kitchen and a balcony." He said "We can have the spare room as some sort of storage, we each get one room, and the kitchen is pretty obvious." He smirked at her "Go, pick your room."

She grinned and nodded. She picked the one closest to the kitchen, in case she wants to cook. She... doesn't know how to do it, but her bro will teach her!

Rin smiled at the antics of her sister and sat on the couch. He stole the cash from the hag before living, and according to Dabi the rent is 136,000 yens (1,267 USD).

He only has 125,000.

Fuck.

*1 Month Later*

Rin was watching Izumi play alone in the sandbox. He still hasn't found a job. Unsurprisingly, no one wanted to hire a 15-year-old brat with no experience or background.

He raised a brow seeing her sister talk with a blonde boy. The boy sat next to her and they started to play it looks. "Hey, is that your kid?" A woman asked him. Seeing her blonde hair, the same tone as the boy, he suspected they were related.

Rin shook his head "Nah, she's my sister. I take her here so she won't get bored in home."

The woman nodded and sat next to him "And your parents know you're here?"

Rin smiled sadly as he watched Izumi face brighten seeing the boy's quirk, that created explosions "We don't have any."

"Oh..." The woman said before frowning. "So, you live with who?"

"Just us." He said, expecting to be scolded or get a pity party, just like the rest of the people he told them that. Instead.

"Are you looking for a job?" She asked and Rin nodded "Well, I am looking for a babysitter."

Rin laughed "Are you sure Ma'am? I mean, you just met me. And I still have to find somethings for my sister. Like a preschool."

The woman grinned "Look, what about this; I'll pay your sister education and your rent if you accept."

That... was too good to be true. "What's the catch?"

"No catch. So, you accept?" She asked extending her hand to him.

He eyed her hand before shaking it. "Sure. I mean, beggars can't be choosers." He joked "My Rin Midoriya."

"Mitsuki Bakugo." She turned to the kids "BRAT! COME HERE!" SHe ordered and he could see the kid grumble.

Seeing his sister get sad, he called her "Yo Izumi! Come here!"

Both kids ran to their respective guardian. "Katsuki, meet Rin. Your new babysitter." Mitsuki said and Katsuki grumbled.

"I don't want a stupid babysitter."

In the other hand, Izumi beamed "Are you going to take care of Katsuki!? Can I be there!?" She asked excited and her brother ruffled her hair.

"Yeah pretty much. And it depends if Miss. Bakugo allows it." He said and Katsuki got an idea.

"Mom! Can Izumi come and play!?" He asked and Mitsuki nodded.

"Sure! I still need to talk some things with Rin about pay."

They drove towards the Bakugo house, all the while the kids playing in the back and Mitsuki asking questions to Rin that answered nicely.

Once in the house, the kids went to play in the backyard as Mitsuki and Rin sat down on the table. "So, tell me what you know. Can you cook for example?"

Rin nodded "Yeah, I can cook, clean, buy groceries, you say it and I will do it." Mitsuki seemed satisfied by that and Rin got a question "Why did you offer me this job?"

"Simple," She said smiling "I know a hurt kid when I see one."

Rin chuckled "Really? A quirk?"

Mitsuki nodded "Yep! It is called 'Feeling'. I know when someone is sad, happy, angry. It makes me a great physiatrist."

"Cool. I guess. So, how do I feel?" He asked and Mitsuki smiled.

"Scared. That's why I want to make you and your sister be safe."

Meanwhile Katsuki and Izumi were following a butterfly until it flew away. "Hey wait!" Katsuki screamed but he trips on something and he scrapped his knee "Ow..." He said and Izumi smiled at him.

"Don't worry!" She said, bending down and kissing his knee. Suddenly, the pain is gone and the wound too.

She giggled at his surprised face "It was my quirk. Bro calls it 'Kiss it Away'. If I kiss someone where a wound is, it heals." She explained and Katsuki grins.

"That's awesome!" He exclaimed and Izumi nodded.

"Hm! I want to be a hero and heal many people when I grow up!" She said and Katsuki grabbed her hand making her blush.

"Then we will be the best hero duo ever!" He stated and she nodded.

Next Chapter: Growing Up