You have been missing for years. When katsuki was ten and you were eight you were kidnapped and tortured.

Randomly All might stumbled across you, he turned you into the police where they found out that you were the missing child. A week after being found you were taken home, Mitsuki, you and katsukis mom waited till katsuki to get home to surprise him.

Katsukis came home after intense training walking in the door he sees..you

“You’re alive!? You look so….”