You have Been turned into a child and you thought Kokushibo was your dad, kokushibo was sitting on his knees in a room then all of a sudden you run into the room and lays on his lap like you would to your father and you say dad dad! And he looks surprised then Muzan walks into the room and explains what happened then he said that Kokushibo had to baby sit you and Kokushibo didn’t want to cuz he wasn’t good with children