One weekend my wife (who was my girlfriend at the time) and I went camping with another couple. Unfortunately, the male half of the other couple could not make it to our campsite on Friday night since he had late meetings scheduled. We arranged that he would meet us on Saturday morning.
I had borrowed my fathers truck and travel trailer for the long weekend. It was only a small trailer (19') so there was only 1 room with sleeping areas separated by a curtain. I knew that if I laid down in my bed I could see the other side of the curtain by looking at the reflection in the oven door. I got a good look at Robyn changing for bed and had a raging erection which I could do nothing about since the trailer was so small and my girlfriend was right beside me.
In the morning Robyn and my girlfriend decided to head up together to the showers. I waited until the got just out of sight and then could hardly wait to get my hand on my cock. I went into the trailer and laid down on my bed, pulled my shorts down, and started jerking off. I had not closed the curtains since I was below the level of the window ledge. Then, I heard someone hop up the step and start to open the door. The window which I was laying below was right next to the front door. I very quickly sat up and pretended that I was changing. My girlfriend and Robyn had come back to pick up some money for the pay showers.
They soon left again and I finished masturbating, more carefully this time. Everything went well that day and we managed to meet up with Robyn's boyfriend. Later that night when we went to bed, my girlfriend whispered to me that she had seen me 'doing myself' and that Robyn may have seen too if she looked into the window. My girlfriend was mad at me for almost getting caught by Robyn too. She felt that it was way too embarrassing. At the time, I was relieved that if Robyn did see anything that she didn't let on. But now (10 years later) I wish she would have been the first one through the door....