Having come home from work early, my stepdaughter didn’t know I was home when she walked out from her shower with no clothes on. I had always thought she had a nice ass, but now I could see for myself. I was in our bedroom when she walked out and went to her room. The erection my nineteen-year-old stepdaughter gave me was nothing like anything my wife had ever given me. I made no sound so she wouldn’t know I was home. As she walked back to the bathroom, she saw me in the doorway of my bedroom watching her. She was surprised but not upset. We exchanged greetings, and she went into the bathroom closing the door behind her. I went into my bedroom and closed the door and started to change my clothes. My erection would not go down, so I lay on the bed and began to masturbate. My stepdaughter came in with a towel wrapped around her. Seeing me masturbating she asked, “Is that for me?” I said it was, and she came and sat on the bed next to me and asked if she could watch. As I was touching myself with my right hand, I started to touch her on the legs. I finished myself off as she watched the whole time.