THIS IS A REAL STORY....Unlike some of the other made up stories here.........My girlfriend and I were fooling around in her room, when her dad called her downstairs to talk. Much to my dismay she stopped what she was doing to me and said she had to go down stairs but to masterbate while I waited for her to come back. I told her that it wouldnt be the same and that I would wait. She refused and handed me a picture of her and her sister and told me to bust on that. Her sister had always been very flirtatious and was very attractive. She was a red-head with nice full D cup breasts. Lucky for them, they were both wearing very sexy outfits in this particular picture. After my girlfriend left I got comfortable and began to stroke myself while looking at this picture. Suddenly my girlfriends sister walked into the room and caught me jerking off! She then saw the picture that I was jerking off to and asked if I wanted to jerk off to the real thing. I nodded and she took off her top her tits were gorgeous, I began to stroke my cock again as she stood there watching just as I was about to bust my girlfriend walked back in and was shocked to see her sister there. She looked at me and asked what she was doing there and I said that her sister had offered to help me. My girlfriend nodded and asked if thats what I wanted. I said yes and my girlfriend took off her top and got on her knees next to her sister and told me to jerk off. I stood over her and her sister and blew my load all over the both of them. It was awesome and I use this day to jerk off all the time. I hope you liked my story. Happy Stroking.