This happened to me three years ago when I was on holiday with some friends. It was a strange mix because the friends were my ex boyfriend who I shall call Tony for this posting, his current boyfriend and also his mother. We had hired two caravans, one for him and his family and the other for myself.
It was Tony's birthday during the holiday and his mother and boyfriend wanted to prepare a special meal for him so they decided to banish him to my caravan while they were working on the meal. Our caravans were next to each other and for most of the time his boyfriend kept on glancing out of the window to see where we were - talk about trust! We found this amusing so deliberately moved around the caravan a bit always making sure that we could be seen through at least one of the windows. This must have driven his boyfriend wild with frustration, but we could always be seen so he was happy that we weren't in the bedroom fucking.
Talk eventually turned to sex and we had plenty of memories to talk about. Of course this talk almost guaranteed that we both got hardons. Tony asked if he could see my cock and with a little bit of coaxing (well not too much), I obliged. It was nice and hard and I enjoyed watching Tony's eyes as he looked at my hard cock for the first time in the five years since we had split up. It was a strange situation, the two of us sitting in a caravan, me with my hard cock out, him massaging his own cock through his jeans and his boyfriend constantly looking over from the other caravan.
Tony asked if I would wank off for him while he watched. He always enjoyed watching me wank and got really turned on when I would cum for him. By this time I was well turned on myself and said that I would love to wank for him again.
At my suggestion we moved position again this time with Tony standing by the open door of the caravan where he lit a cigarette and tried to look cool. Poor sod had to adjust his erection so that it didn't show as he was in full view of the other caravan and his boyfriend's watchful eye. Next to the doorway was the door to the bedroom and I stood just inside and stripped naked for Tony to get a good eyeful. He was delighted at this and asked me to turn round and show him every bit of my body. I felt real horny standing there naked with my fully clothed ex looking me up and down. I was pleased that my cock was fully erect for him and standing up very very straight.
After a short time Tony asked me to start wanking and by this time I was only too pleased to do so. To be honest I could have cum almost immediately as I was as horny as could be, but he wanted this to last as long as possible so I had to keep on stopping, My cock was really hard and I really wanted him to wank me off but that was not possible but he did move forward briefly to hold it and give it a little tug. Only wish I could have cum while he was holding it but sadly he only did this very briefly before moving back into view. He didn't want his boyfriend to become suspicious.
Conscious that we could soon be called to the other caravan for our meal, we agreed that I should finish myself off while Tony watched. I went for it and was soon shooting a nice amount of spunk while Tony stood and watched me. It went all over the floor and I was really quite pleased with the amount. I always managed to cum a lot if I wanked off while standing up.
Poor Tony would have loved to join in but that wasn't possible. I cleaned myself up quickly and got dressed again and then moved into clear view of the other caravan while Tony moved in to the bedroom to clean up my spunk. The cleaning up was his idea not mine, and besides I had done all of the work up until then.
All of this was completed just in time as we were called over to the other caravan for the meal. Best part of the holiday-the wank that is not the meal!