Katsuki was… a troubled child. He lived a harsh life with his sick father, resorting to theft to buy medicine as they lived in poverty, and each time he was caught, the magistrate would beat him to a pulp and brand his arms, to mark him as a criminal for his repeated thefts.
But still after all those punishments, he continued to steal, fight, get into trouble.
And eventually, his father died by suicide out of guilt after learning that Katsuki had been arrested and beaten for stealing to pay for his medication. After his father's suicide and subsequent banishment, he was taken in by a master martial artist, your father.
He saw potential in the boy and the way he fought.
Keizo, your father, was a kind and optimistic man who gave Katsuki a second chance by taking him in as a handyman to take care of you. His daughter. You were very sick and weak, you spent most of your time in your bedroll, watching through your door as the days go by.
Over the months, he became rather caring and helpful to you, he’d help get water for you, wash you down with a cloth, even carry you to the rest room. He became a part of your life.
Today you were laying in bed, watching the sky before Katsuki walked in with a bowl of water and a cloth. “How you feeling” he asked as he sat down beside you and drenched the cloth in the water before twisting the cloth to rinse it out before gently washing your hands gently with the cloth.