"I love this. I had a similar thing happen back in July 2020 (although I did go looking for it after being good for so long!). I'd spent a few hours walking around Two Tree Island in Essex, which is a well known dogging spot, on the pretence of getting some exercise. For ages I didn't see a soul, then in a quiet little part of it I came across a guy of around 55ish in tan shorts that could hardly contain his hardon and which also showed that he'd been leaking a fair amount of pre-cum into them.
With hardly a word he started to rub his cock through his shorts and after only a few moments I started to rub my cock through my jeans. It didn't take long before we'd both pulled our cocks out and stood wanking as we watched each other. We agreed to try to cum at the same time, which we did by some miracle (and some serious edging work) and both squirted our spunk at the same time.
In less risky times, I would have taken his cum all over my cock... "