I have been married for 10 years and have always had a thing for my wife's brother (I'll call him Rich). Rich was one year older than myself and in very good shape. He was a bodybuilder and had the best tanned and shaven body anyone had seen.
When I was first married we lived in the basement of my wife's parents' house. Rich also had a room down there. I always tried to look at Rich, when he would go from the bathroom we shared to his room, after he showered and had some success.
One night after work Rich jumped out of the shower and went to his room with out a towel. I just came out of my room and saw him there stark naked. I instantly got a super hard-on. Rich just said hi and went on to his room. I went into the bathroom to get my shower. Since I had that huge hard-on I turned on the shower and sat on the toilet and started stroking my man meat. I only got a few strokes in before I was shooting my load all over the wall. I then jumped into the shower.
After I got out of the shower I went over to Rich's room and tried to look through the slats in his door. To my surprise I found him dressed in women's clothing stroking his shaven cock. I stood there watching him for a few minutes. My cock started to get hard again. I started to stroke my meat and continued watching him for a few minutes until I lost my balance and fell into his door. I hit the door so hard that it flung open exposing him in his attire with a ragging hard-on and me with my manhood in hand. I just said CAUGHT YA!
I thought he would be upset but he didn't seem to be. He just asked if anyone in the house had heard us. I got up, looked around, and said no. I started to apologize for spying on him. Rich told me to get in and shut the door. I did as I was told. Rich told me he had known that I was looking at his cock and said he didn't mind, that he fantasized about me often when he jacked-off.
He then asked if what he was wearing turned me on or not. I said I liked it. He then pushed me onto his bed and said he was going to take care of that hard-on I had. He started to gently stroke my cock up and down until I let out a little pre-cum. As my cock was getting a closer to blowing he started to stroke me faster and faster until I couldn't hold it any more. I told Rich I was going to blow. He stood up and I shot my wad on his hard cock.
Rich said, 'I took care of you, now you take care of me!' I got up and Rich lay on the bed. I started to stroke his cock with my cum all over it and started to rub his hairless balls. As I increased the massage to his member I could tell that he was getting ready to blow. He told me to shove my finger up his ass. As I did that he let out a low moan and shot the biggest wad of cum I have ever seen all over my chest.
We just lay there for a few minutes and then Rich asked if I was glad I finally got to see him. I replied, 'YES'. We decided to meet once a week and have a mutual jack-off session. Even though we are both married and have our own houses, we have been meeting now for ten years and keep our secret just between us.