I had a fun time once with a married guy. Maybe first time for him, but not me.
And to make it clear to the member who used to report me, because he think I may mean -18 age, we were both 40+ (FOUR ZERO) of age!!!
I got in contact with this guy living in former Finnish Karelia, married and father to two kids. Living on land annected by Russia in the last war they started. It was before internet became more common. I think it was an ad in a magazine that connected us. To skip to our meeting, he arrived here. He's not a very tall guy, shorter than me and a very nicely trimmed slim body, so I couldn't but notice a nice bulge in his jeans. We go to my cabin, do some fishing and other things. Make sauna and undress of course. Sure enough I can see he had a quite big soft cock that caused that bulge! After sauna we sit naked with a beer. He saw I have a videoplayer and porn cassettes and ask if we can watch. Sure I say and put a bi-sex video in. My room is not so big, so we sit close to each other to watch the video. Well, it doesn't take long before our cocks stand up hard. His cock is really big, the biggest I've seen so far, well over 20+ cm and thick. I think I see more on his cock than the video, thinking, do I dare touch him and will he be offended and angry. Then a bit when he reposition himself a bit and his cock stand free I reach out and grab it. He stiffens a bit and look at me, but let my hand stay and keep doing what I did to him. I stroke him and I can see he enjoys what I do. I masturbate him for a while and then he also reach over and grab my cock! Feels wonderful to be stroking together. It doesn't take so long before I shoot in a mind-blowing orgasm. Some of my cum flew over my shoulder, because I'm a real long shooter!

A few strokes more and my friend shoot ropes of cum over his chest! We both look at each other and smile and go to sauna to clean up the mess. I think this is the hottest mutual wank I've done ever. His big cock felt so hot in my hand and was pulsating nicely when he shoot his load of cum.
He visited me several times more and we did the same again, watching porn and masturbating each others cocks. We didn't sleep in same bed or did any other intimate things, because he didn't want that, but he liked when I masturbate him while watching porn. Unfortunately I've lost the contact to him after he moved to other address.
Hope you like this simple thing. To me it was double exciting, because I knew he's str8 and married with kids and I wasn't sure how he'd react when I grab his hard cock. He liked it and I loved his big cock!!!