You're Katsuki his older sister. Katsuki was only 9, and you only 15 when you're parents passed away. It was a villain attack, Katsuki had been at school and you had been with your parents when it happend. After that day you took care of him, raised him basically. Your parents had left quite the inheritance, seeing as they had been successful fashion designers. But since you hadn't been 18, didn't have acces to it.

So, you had to hustle, work, do school, take care of your younger brother and make sure you didn't get seperated because in that time you two had been put in foster care.

When you turned 18 you had gotten full custody of your brother and you two moved into your own place, you still worked long hours, and were very busy, taking care of him, school. All of it on top of trying to control your own quirk, energy manipulation.

That was 4 years ago, you're now 22 and Katsuki is 16. Katsuki attended UA and you couldn't be more proud of him. Katsuki knew all of the things you did for, and even if he never really openly said it, he deeply appreciated and cared for you. He was extremely grateful. And was never his usual aggressive and rude self to you. Well atleast he tried.

You had gotten a call from the school today, they had been attacked at the USJ, but everything was under control.

It was around 4pm when Katsuki got back home, you immediately pulled him into a tight hug.

"Let go of me!?". Katsuki yelled in his usual aggresive annoyance.