It all started with a conversation I was having with my soon to be brother-in-law. When I think back on it I am so happy that I was honest with him and told him how I felt, besides I thought I was helping not only him but my sister also. If she had found out what had happened she might not believe it as truth, unless she saw it with her own eyes. God forbid that ever happen.
Phil and I had known each other for years, we went to school together and were in the same graduating class. Kim, my sister was three years younger and had been going out with him for more than two years.
He spent a lot of time at our house and if she was not there he would wait till she got home from work. He made small talk about school and things like that but we never got too friendly.
Not long after she graduated from school they moved in together, got engaged and started planning the wedding. Kim would come home now and then to work on the plans for the wedding with Mom. Phil would come and sit around outside, wash his truck or hang out with neighbor.
I was just getting home from going shopping. I noticed Phil's truck but didn't see him. I ran into the house, Kim and Mom were talking about the wedding. I said hello and ran down the hall and up the stairs as fast as I could. I didn't notice the door was closed, I just had to get in there. As I pushed the door open I was in shock as to what I was seeing.
Phil was sitting on the vanity, with his big hard cock in his hand stroking it, I looked up and he met my eyes, a big smile came across his face. He hurried me in the bathroom and shut the door. I asked him why he was beating off in our bathroom, and why he didn't lock the door.
At that time I didn't care either I just knew I had to go to the bathroom or I just might explode. I asked him to step out so I could go pee. "No" he said "I have seen you sister go pee what's the big deal?" I told him I was her sister and he was sleeping with her not me and he had no reason to stay. "Well, I just can't go putting this big hard cock back in my pants and walking into the family room like this." He had a point, "OK, just turn around and plug your ears it's the least you could do."
"Do I have to cover my ears?" he asked me. By this time I'm pulling my pants down and he's looking the other way. I hurry and go, wipe and flush. I tap him on the shoulder to let him know it's safe to turn around. I go toward him to use the sink to wash my hands, looking at him he smiles at me and puts his hands on his now deflated member.