I am slept with my step sister. I am twenty years her senior. I don't know how I should feel. She told me it is normal and nothing wrong with it. We have done three times in my apartment ,She even invited one of her girlfriends over for me to play with while she was out of town. We were not raised together. She is from my father's second marriage. I watched her grow up. I love to be with her but wonder if I should be ashamed and confess to my family and end it.