" Do you?" She asked coyley as I felt her hand drift down to my crotch to grab and gently rub my erection. "Is this for me?" You're my little sister!"...I said in shock even as she was making my cock harder."Hmmmm, and you are my very BIG brother." She said as she slipped her hand inside my waist band wrapping her cool, delicate fingers around my shaft.I moaned inspite of myself, "we can't! You're my sister, I'm married, you're married..." It's not like I want your k**, and it's not cheating with. As we reached our mid-teens, we would both masturbate in our own rooms, privately.One day, however, I was home from school in my room, naked, lying on my bed masturbating and had forgotten that I hadn’t closed my door. I was in the heat of passion and moaning when my step-brother arrived home. He was standing in my doorway watching me deeply engaged in my moment of pleasure with my eyes shut tight, engrossed in getting myself off.He came in, closed the door and, not making a sound, he started. She jumped out of bed, ran downstairs and grabbed their clothes from the living room. She was just coming into the kitchen when Jack appeared at the bottom of the stairs. She gave his clothes to him on her way into the bathroom. She washed up, then fixed her hair and make-up. Jack followed her into the bathroom, used the toilet, then washed up and combed his shoulder length black hair after he dressed.He helped Ariel with her dress, zipping it up for her, then tying the red scarf around her. We had cummed twice but were not done yet. Ratna then made me lie down and came on top of me. Opening my legs she came in missionary position and touched her pussy against mine. This felt like an electric shock to me. I had goose bumps as Ratna began to rub her pussy against mine as if she was fucking me. I loved the way she treated me. She kept rubbing her pussy slowly as I felt loads and loads of pleasure build up inside me.She then bent down and kissed me and we both played with each other’s.