I found this site by accident and wanted to say that It was a relief to know that this kind of experience has happened to other guys who are straight. My wife and I had a good friend go with us to the lake for some sun and a swim. I had known him for about 2 years and knew with his looks he had no trouble with the ladies. When we got to our spot on the shore there were already two good looking girls sunning and some families with kids. He wasted no time in making his way over to the girls and introducing himself. I stayed and rubbed oil on my wife which is always a turn-on for me. Not to mention the added scenery. Well this lasted all day and we decided to pack up and leave when my buddy's new friends had to leave. When he walked over I noticed he had a sizable semi in his shorts and I smiled to myself because I knew mine was showing too. He said he needed to take a leak and didn't want to go back in and get wet before we left. I pointed over to some bushes and told him to watch out for snakes. While my wife and I packed the trunk I looked over where he was and I could see him through the bushes shaking his 7 or 8 inch cock and stroking it with his other hand a couple of times. It looked to me that he was feeling pretty good at that point when he turned and saw me looking. I just kind of turned and played it off. When he walked back over I could plainly see his head and veins bulging through his swim suit. I pretended not to notice anything and we left.
When we got back to my house he asked if he could shower and I showed him the hall bath. There was already a big bottle of lotion by the sink. I knew he would notice this because I always used this for my usual routines. I went to the kitchen and played around with my wife some while she cooked us dinner. I heard the shower go off and I told my wife I was going to shower. I went in our bedroom which is right next to the kitchen. I pushed the door closed and stripped off my trunks. It felt great to finally let every thing just hang out. I turned on the shower and started shaking and stroking my cock just like I had seen my friend doing it earlier. I walked to the foot of our bed and sat on the edge and continued until I had a raging hard on. My head was spinning thinking about how good it felt and seeing him do it earlier. I stood up to get my lube from my drawer. I turned and looked in the huge mirror above our sink when I could see that I hadn't closed the door all the way. It was open just enough I could see my friend standing by the bar in the kitchen and talking to my wife. Well I figured if I could see him he could see me. I pretended not to notice the door and continued my session. I positioned myself so he could get the full view. By this time I was ready to explode. I took my time giving my cock full strokes so he could see it all. I felt my balls draw up and the contractions from the base of my cock all the way to the head. I shot about 4 good squirts on to my hand and leg. I regained my composure and cleaned up when I glanced over to see if he was still watching. I looked him eye to eye in the mirror. He had a big smile on his face. I grinned at him and turned and got in the shower.
We never talked about it later and he moved away a few years later.