I had a friend in school who's mother was divorced. In our community that was somewhat of a unusual thing. She was big and blonde and German. I thought she was the hottest thing and often thought of her when I wanked at night. I never said anything to my friend about his mother but lots of our other friends joked with him about his mother's large breasts and how hot she was.
When I was in the eighth grade, she got a new boyfriend. He was an airline pilot and drove a white Mercedes convertible. There were a few times when I was over at their home and the boyfriend would come over we were told to go find somewhere else to play. It was clear that the adults wanted to have sex with no kids around.
One afternoon, I was riding my bike through the park and saw my friend flying a model airplane. He said that he had been told not to go home for an hour or so.
I left the park and rode over to his house. The Benz was still in the driveway and I decided to see if I could look inside the bedroom and see what was going on. The master bedroom was on the back of the house with a sliding glass door onto a patio. I left my bike between the houses and snuck around to the back door. By creeping along the wall I slid between the window and a gas BBQ that was placed beside the wall. From there I could see what was going on in the bedroom.
My friend's mom and her pilot boyfriend were lying naked on the bed, she was on her back with her legs spread open and he was lying beside her, on his side, fingering her as they kissed. This was the first time I had ever seen a woman's vagina before
By this time I was hard. I was wearing a pair of thin nylon running shorts with the built in net underwear. I quickly pulled out my cock and came after no more than 10 seconds of stroking.
I was thinking about how I was going to crawl out of the space I was in without them hearing or seeing me when the boyfriend rolled over onto his back with his penis sticking straight up. I realized then why she liked him so much. He had the biggest penis I have ever seen, even to this day.
I have seen some porn movies and photos on the internet of guys with huge cocks, but I can't be sure if they have been altered. This was a real penis, not more than six feet away from me. It was at least 12 inches long and thick with a pronounced head.
She was very careful when she mounted him and took it inside her. I took my cock out again and stroked myself some more as they made love. I did not come again but the feeling of masturbating with my semen as lube was nice on my semi-hard cock.
When they were done, they both got up and went into the bathroom. I used this chance to leave the patio, get on my bike and ride away. I got about a block away and had a crazy idea.
I returned to the house and rang the doorbell. I was just about to leave after the second ring when the door opened. She was wearing a thick terry-cloth bathrobe and I knew there was nothing on underneath.
I asked if my friend was home and she laughed and said 'no' but suggested he might be in the park with his model planes asking me to let him know it was 'safe' to come home now. I rode home, thinking about her and was hard again. I jerked off many more times that night.
That was the only time I have ever been a 'peeping tom'. That afternoon experience provided years of masturbation fantasy material.