Right after college, I worked as a manager at a small restaurant. One night, one of the girls working there asked if I was gay or bi (I was out and everybody knew I was gay) and if I would cheat on my boyfriend. I asked her why she was asking these questions and she finally told me that lately she had been fingering her boyfriend's ass while she sucked him off. They had bought a small dildo but they were wanting to find a guy to fuck him.
A few things about her: She was the sister of the night manager. Her boyfriend also worked at the restaurant. She was NOT attractive at all. But her boyfriend was very cute and my boyfriend and I had talked about him before.
Later that night, I was doing inventory in the walk-in cooler when her and her boyfriend came into the cooler. They asked if I had thought about her questions and I told them that I would have to talk to my boyfriend first. Honestly, as cute as he was, there was no way I would have sex with her or around her. She then unzips his pants and pulls his dick out. It was maybe 5 or 6 inches and on the thin side. She grabbed my hand and put it on his dick. I jacked his dick for a few seconds and then pulled my hand off. She asked how big my dick was. I will admit that I was rock hard (and it showed) after playing with his cock. So I pulled it out and showed them. She then took his hand and put it on my dick. He jacked my cock for a few seconds and then pulled it off. I put my cock away and told them I would talk to my boyfriend.
The next time I saw them, I thanked them when I asked my boyfriend, we both agreed that I shouldn't do it. (And honestly I told my boyfriend about it but I told him that I wasn't interested.) She then told me that my dick was too thick and it scared him. Which is good, we never talked about it again.
About 10 years later, I was grocery shopping and I ran into him and his wife and their kid. He was wearing his work uniform. We said hello to each other. He still looked really good.