I was hanging out in my bedroom playing video games when I got a call from my step sister. She invited me to her room but she didn't specify what it was for. I walked into the room and found her on her bed, spread-eagle. She was rubbing her hairy pussy and smiling. "What are you doing? You're my step sister!" She laughed it off and said, "So what?" I was really uncomfortable, but then she reminded me that she was only my step sister. I agreed to stay and watch, but only watch, because I was curious. I have admired her for years and now I'm actually seeing her naked for the first time. She closed her eyes and stimulated her clit like those pretty girls on the internet do in porn. I started to sweat and she called me out. I told her I was getting excited. She invited me to lay down and then pulled out my big black dick. It was the first time she'd ever seen it.