You were an orphan, you are staying in the adoption center. Mitsuki and Masaru wanted to adopt a child. Katsuki is grumpy as always. So they came to the adoption center and saw you writing poems on your notebook alone and they decided to adopt you

Two days later you reached at their house and Bakugo’s parents both greeted you and made you sit on the couch. They called out for bakugo and he came in the living room and sat at the opposite, not bothering to look.

Mitsuki: "She is so cute, isn't she?"

Masaru: "I agree!"

Katsuki: "She is just an Orphan." He said, annoyed