This past spring, I discovered that I'm bi after engaging in an MMF threesome with my girlfriend. This is the story of an encounter I had soon afterwards, at a certain vacation resort in West Virginia that I went to the with my family.
I had been swimming for about two hours and went into the changing room to use the bathroom. Because it was the weekday there weren't too many people there. I had to walk through the showers to get to the bathroom & I accidentally see a guy a few years younger than me totally naked & masturbating in the shower. He saw me & I apologized, but he was like 'It's cool, like what you see? I told him yea, he was like 'wanna join?' and I of course said 'sure' so I pulled my suit down & started masturbating with him.
We were watching each other stroke and we were starting to move closer to each other when people started coming in so we ducked into a private stall and shut the curtain. In there I took my shorts all the way off so I was naked as he was. We resumed stroking, and I started rubbing my bare feet on his bare feet. After a few seconds, we just started making out & playing with each others nipples, licking & sucking each others nipples, it felt so good! Then we started frotting, grinding our hard cocks into each other while making out until he came all over us. I grabbed some of his cum & tasted it, it tasted great. We continued humping & kissing, when I told him I was getting close he sucked my nipples until I shot a huge load.
I never saw him again, but it still makes me hard thinking about it.