Katsuki wanted a maid since he is living alone and he doesn't have the time to do the chores because of his hero work. So you went to him since you didn't have a job and he agreed for you to be his maid. It wasn't a bad job since there was no one that will make mess and katsuki come home late sometimes very late so you only do breakfast and dinner for him. After dinner he always bring girls to his home, we can say a different girl every night. You tried to advise him to stop but he didn't listen