In a lot of the classrooms at our school the desks are arranged into pairs which are in rows. Last year I was in english when I was sitting up the back next to Matt. He had just had PE and hadn't had time to change so he was still wearing his gym shorts. We were viewing a powerpoint on essay writing so we were just sitting back swinging on our chairs leaning against the wall until all of a sudden I look down and see Matts cock hanging out.
He saw me look at it and he then went immediatly hard. I was about 7.5 inches long at this stage and really thick and cut. He then saw me growing mine in my pants. He then said he liked the size of mine which he had seen in the change rooms. Our teacher then told us to stop talking and we both went soft. He then let us out for a break and that when it got interesting.
I went to the toilet near the office which no one really goes to and as I was pissing Matt came in and started as well but he was being a little different. He started to rub his cock which was now hard and turned and showed me. This made me istantly hard and I reached my full 9 iches we then both jerked off...finally he was the first to cum and did about 6 ropes I then came and blew 8 ropes into the urinal. We then cleaned up and flushed.
Later that year I shared a tent with Matt and Steve at camp.