I had a huge smile. There was nothing I liked better than watching Judy have sex. I wasn’t well endowed (about 2 inches hard) but boy I could get ho...ny watching her. They were going at is some more and I know they each came again when I heard the lock on the front door open. In walked a young man in his early 20’s. He smiled at me and said he was Jim’s son and was his dad busy. I pointed my head at the TV and he said, “oh, he’s with Judy, they must be having fun.” The fact that he knew Judy was. She excused herself saying she needed to use the bathroom which I didn't think twice about since if you have to go you have to go. She went into the bathroom and closed the door behind her. Not thinking about it at first but after several minutes began to wonder why close the door we just saw everything. More time went by without me hearing the toilet flush or water running in the sink and just as I was beginning to think something must be wrong maybe she if feeling like she made a mistake the. “Billy”, she said sternly, “watch Bobby and do what he does.” Stacy leaned forward quickly as if to slap me again and barked, “You’d better start stroking that little thing before I knock your damned head off!” I had jerked off before while looking at one of dad’s magazines, but I had never dreamed of admitting to it, much less committing the act in front of someone…especially a relative. With tears still rolling down my cheek, I took hold of my now erect, five-inch penis, and began shuffling. I slowly pulled out some, then thrust my butt down again, a little faster this time, and my dick went inside her pussy with ease. I heard a slippery sound down there, and I didn’t know what it was but I liked it. I pulled out a little, and pushed my big dick back in her, and it went all the way in this time, and so much easier. Her pussy was getting so slimy, too. Not touching her with my legs or leaning on her at all, I started thrusting my butt up and down, at a slow, rhythmic pace and my.