He walked in and I just couldn't quit.
I had just gotten home from work and my wife had already left. Her father had lived with us due to his inability to manage his diabetic issues. I was all horny from work having seen a co-workers pussy when her dress blew in the wind when we had been outside. It really had made me hot. Anyhow, I went into the bedroom and stripped down nude. I put in a porno DVD and started stroking it.
It was about 5 minutes into it when Ken walked in on me. He said yeah I used to do that when I was a kid. I started to cover up as I asked, 'Do What?' He said 'Jack off, your jacking off right?' I said, yes I am. He said, 'I didn't see any come so I must have missed it. Go ahead and finish for me.' I was so horny anyway I just spanked it even harder and faster. He stepped closer and as he watched cum hit my chest in 5 big squirts. He laughed and said, 'Please do it for me whenever you want. Its nice to remember how I did it.'
He then went on to tell me he used to jack off four times a day. He also told me he once jacked off in front of a group of 17 people who bet him he wouldn't. In the next month, I probably jacked off in front of him 45 times. He always laughed and asked me if it was a good one. He probably liked the fact I wasn't fucking his daughter much. Too funny.