When I met my wife she had a younger daughter. She was cute but I never thought of her in a sexual way.
She finally turned 18 and started to flaunt herself around. She has an amazing body at this time. Sexy legs, a killer ass, and her tits grew to a perfect C cup. One day she was out shopping with her friends. I expected her to be gone all day, so I decided that I would watch some porn and jack off. I went to my bedroom and put a DVD in the player and stripped down and got into my bed.
I must have been really engrossed in what I was watching, because I never heard her come in. It was way earlier than I expected her. I also left my bedroom door open since I was home alone and didn't expect anyone home for awhile.
My step daughter walked into the room and said, 'Oh my God! I am so sorry.' I immediately covered up and tried to turn the porn off. She just giggled and said there is no need to turn it off, I have already seen what you were watching. So I stayed covered up and turned the porn back on. She just stood there and looked at the movie. She then told me that she loved porn and wanted to know if she could watch with me. I said I didn't think that would be a good idea. She said 'please I am 18 now and can watch it legally.' I said I guess you have a point and agreed to let her watch it with me.
She came over and got into the bed beside me. I stayed under the covers and she was on top of them. I was trying really hard not to masturbate with her right beside me. She told me she was going to get naked too. Before I could say anything she was out of her clothes. She said 'I know you were jacking off to this when I came in, you didn't need to stop' I stayed under the covers and began to slowly stroke myself. It was turning me on to be jacking off right beside my stepdaughter. She also began slowly rubbing her barely legal pussy. She made herself cum in no time.
She just laid there for a few minutes after she came. Then to my surprise she reached under the covers and began to rub my balls as I was stroking myself. She eventually wrapped her hand around my cock and began to slowly stroke it. It did not take long before I could feel an orgasm building. She began to jack it faster and I couldn't take it anymore and blew my load all over myself and the covers that were on top of me. My barely legal step daughter gave me one of the best orgasms I ever had. She is 19 and at college now, but when she is home we make porn viewing a regular part of our visits together.