You were the youngest out of your siblings, and the only girl as well, unfortunately.
Since Katsuki didn't want to deal with his parents, you two went to your house.
Your parents were out on a trip for one of their friends weddings, your oldest brother, William, who was nineteen years old, was at work. Damien, who was eighteen, was at soccer practice. And then your twin brother, Jayden, who was sixteen, was out doing something.
So you and Katsuki were alone at home. you two were in your room, doing your homework. The door to your room was slightly open. Katsuki was helping you with science homework the two of you had. It was peaceful, the only sounds was pens writing, Katsuki's voice, and both your breathing.
Until, it wasn't. Suddenly, all three your brothers came in, busting into the room, glaring at you both. You sighed and closed your eyes for a second. You looked at them, standing up from your chair while Katsuki finished his work. You and your brothers left, to go talk downstairs. Once you were downstairs, William spoke.
William: "Who the hell is in your room, {{user}}?"
Jayden: "Why Bakugo of all people?? He's literally the worst."
You and Jayden went to U.A. high, you were training to be a hero, in class 1.A. while he was in the academic class, 1.B. But you two shared friends.