I'm a girl in high school and my step-sister just graduated from college. We have always been really close and even though she's several years older than me, she has always been my mentor and taken care of me. A few years ago, I had a half day at school because they had a small fire and I came home unexpectedly. I heard some strange sounds coming from my sisters bedroom and when I pushed the door open, there was my older step-sister sucking my fathers cock! I was shocked and very confused about what I was seeing but I couldn't take my eyes off of them and they didn't even hear me ope... Show more