I was fifteen then
My uncle had a farm about 20 miles from our town and we visited quite often for a weekend or just a day or two, but this time when I was fifteen my uncle invited me down to stay for two weeks during the school holidays, my aunt said to bring some old clothes as I was expected to help out on the farm.
My aunt and uncle were both in their mid 40's and had a couple of hands working for them, George who was about the same age as them and Robbie who was 25.
After being there for a couple of days my uncle asked me to go with Robbie and help fix up some stalls that needed repairing in one of the barns, it was hot work and a hot day and we worked away and then had lunch.
After lunch we started again and soon were soaked in sweat. Robbie took off his shirt and I followed suit. About an hour later we were finished and Robbie said I had done well and he would reward me. I said that I was happy to help.
I was wiping my hands and had my back to Robbie when he grabbed me and pulled me onto the floor, turning me onto my back he proceeded to undo my trousers and pulled them down, followed by my briefs and pulled my boots off followed by my clothes, so I was completely naked. I just lay there and watched as he stripped off as well.
When he was naked he knelt beside me and started playing with my cock and balls and soon I was hard, about five inches as I watched his cock grow to the biggest real life cock I have ever seen, it was about nine inches. He started pumping my cock and a few minutes later I came in a stream of cum but he kept going, he then said for me to do him and what a cock to be holding as I pumped him till a few minutes later he also came. He asked me if I had enjoyed that as we got cleaned up and dressed and I said yes.
We returned to the farm and my uncle asked if we were finished, Robbie said it was all done and told my uncle I had been a good hand, my uncle just smiled.
Later I went in for a bath before I went to bed, and when I went into my room with just a towel round my waist my uncle was sitting on the bed. He asked if I was properly dried and I said yes but he said he would make sure and removed my towel, he started rubbing me all over and was soon drying between my legs and cock which began to rise with the attention it was getting and was soon solid.
My uncle gripped my cock and said not bad for your age, he then asked if Robbie had wanked me off, I did not want to get him into touble and hesitated but he said he already knew as he had told him, and that I liked it. Uncle and Robbie had done it plenty of times to one and other. He then slipped his trousers and underpants down and he was fully erect about six inches. He wanked me off and let me give him a wank, we had a great couple of weeks of working and wanking.