Because he likes your I’m a dad grandpa and a veteran nothing scares me vintage shirt butt. Obviously this is not good if he is your stepfather and it would be bad for any man to stare at any part of a 14 year old girl. As another answer said stay away from him. But depending on your relationship with your mother, you should tell her. You should also talk to your school counselor and explain the situation and how it bothers you.