Masturbation Memory

I awakened about 4 in the morning with a huge hard, and got up to pee. In the bathroom, I very much admired my still growing penis which was then 7 inches long when it was hard. This sight set off my never too submerged horniness, so before returning to bed, I lubed it up with vaseline, took a towel and face cloth with me, and returned to bed. I put the towel on the bed, with my smoldering ass on top of it, pillows behind my back so I could see what I did to my pecker, and started to stroke. My room was on the second floor over the master bedroom. When the house was remodeled, an air conditioning duct was installed which must have been connected to my parents bedroom allowing me to hear them more or less clearly. I never said anything about this because I enjoyed the snooping, and when they had sex, I could jack off to their rhythm. This night when I was well into the session, I heard their bed begin to squeak in the usual way during their screwing. My jacking began to keep time with them; after about 10 minutes, I could hear my mother gasping, and rapid bed squeaking followed by sighs. I had a very hard come.