My Father and My Uncle

I was 22 years-old, and my father and uncle (my mother's brother) were in their late 40's. Uncle XXX and his family came from Arkansas visiting us for a couple of days. Both families agreed to spend one day camping. Dad and uncle XXX disappeared for long time, and mom asked me to look for them since the lunch was ready. I went into the wood trying to find them and took me about 15 minutes. To get a surprise that was the most exciting scene I have never seen, There were dad and my uncle with their pants down and stroking each other cocks. They never caught me spying on them; however, I stand in my place for about 10 minutes watching and jacking off until my father rubbed my uncle's balls and shoot a big load as a volcano in eruption. Then my uncle took my dad's cum and start jacking off faster and faster, but I cum first and went back, scared, and told mom that they will be in a couple of minutes to have lunch. It was the first and last time I saw them doing that, but it still comes to my mind every time I want to jack off.