On a camping trip with my mates, we were three of us in a tent and I was getting hard and horny, (they were not the reason) although one of my mates was bulging well.
We were all in our sleeping bags and I was really hard, (18 at the time) so pretty much hard all the time.
I needed to wank, so made out I needed to go to the toilets, and as I was crossing the field I could see this couple in their tent (it was dark and they must have had a low light on) - I could see shadows, I could even see his cock and knob as he rolled a condom on, wow was that hot..
I was outside (not directly) but I started rubbing my cock through my shorts, then having checked no one was around, got my cock out and wanked as he pushed deep into her pussy, I must have been there for about 10 minutes as he was fucking her and I was wanking off, that was fucking hot.
I had to go over the the toilets and just as I was leaving, I saw this hot guy getting out of the tent and head over to the block with a shower towel, I waited until he got over and went into the shower cubical and then went in for another wank - God he was so hot, wished I was in the shower with him