Happened yesterday. He was in his 40s, married, like me, nice looking, average kind of guy.
On camping holiday in New Zealand staying on camp sites. Yesterday afternoon used the site hot tub when hardly anyone around. Had been in for a while when a German guy came and sat in with me.
Exchanged a few words-his English was better than my German.
After a while we got out and sat on the bench beside the hot tub. I sensed he was maybe sending me a signal as a couple of times he used one hand to fondle himself whilst maintaining eye contact with me.
We both wore boxer type swimming shorts, and I decided his actions were a definite hint so let my hand fondle myself over the top of my shorts, making sure he knew I knew he was watching.
After a moment, he said he was going to take a shower, the men's showers being nearby.
Whilst nothing was said, I knew he was inviting me to join him.
Nonetheless, I let him go on alone whilst thought about whether to risk joining him. After a couple of minutes I decided I'd risk it, I was feeling horny as hell anyway not having had a cum for a while. (The wife refusing to make love in case people heard us!)
When I get to the shower block he had had his shower and was sat on a bench towelling off his feet with one end of his towel which was wrapped around his waist.
I went into a cubicle and had a quick shower half expecting him to join me. But he didn't.
When I got out, my towel around my waist and my shorts in my hand, he was still sitting on the bench with his towel around his waist. I sat on the bench and we started talking again but this time he let his towel slip such that his cock was visible. He was semi hard and he made sure I saw him fondle himself and that I knew he knew I saw.
Somewhat nervous of being discovered, I managed to gather enough nerve to move my own towel enough to expose myself too.
Clearly we both knew by then that the other was up for some fun. He reached over and took hold of my cock, by then I was starting to get a hard on, and began to stroke me. In turn I reached across to his and did the same. He was fully hard by then. He was shaved around his cock and balls, and was uncut like me. His cock felt very hard and warm and I sensed an urgency in him. It felt good stroking his full length, and feeling his reactions.
I had been stroking him for less than a minute when I saw a couple of large blobs of cum from his cock drip onto the floor, and thinking he had cum (they were that messy ; lol) was about to stop stroking him, when he thrust his hips forward and two thick jets of cum shot out landing on the floor a good two feet away.
He kept stroking me, his eyes glued on my cock and his free hand playing with himself (I had let go of his cock after he'd cum). I noticed that his cock remained hard, barely losing any erection after his cum. I whispered when I was about to shoot my load and he slowed his strokes on my cock and watched intently as I shot my (less impressive) load.
Luckily no one saw or disturbed us.
For me, it was thrilling to feel the extent of his arousal and excitement, evidenced by the speed and intensity of his orgasm.