The first time I (M34) shared my fiancée (F27), who was just my girlfriend at the time, was about a year and a half ago. I had told her pretty early into our relationship that I was into MFM threesomes, and she told me that it was something she fantasised about too. For the previous year we had been dirty talking about the idea of another guy fucking her and situations like that, so after really talking through some boundaries we agreed to dive in and give it a go.

My fiancée is an absolutely beautiful women with an hourglass shaped body, massive boobs and great legs, so I knew we would have no trouble finding a third who would be willing to play with her. The way we decided to operate was for her to sleep with a stranger, as we didn't want our social circle to find out about it or for it to affect any of our friendships. We also weren't interested in her making any sort of emotional connection with whoever we chose, so the night we wanted to give it a go, she signed up for Feeld (sort of like Tinder for threesomes and kinksters) and got to swiping.

She is very picky and was only swiping right on about 1 in every 50 guys on the app, however after an hour or two she had a few matches that she was talking to. It was about 10:30pm when we were able to make plans with one of the guys for him to come over to our house. We were very nervous beforehand and both drank a fair bit to calm our nerves. The guy arrived and was very respectful and also pretty nervous, as he hadn't had a threesome before. We sat on the couch and chatted for a bit to go over boundaries and expectations. Once everything had been discussed, to get things moving, my girlfriend just asked if we should take things to the bedroom.

When we got into the bedroom, he helped take her dress off and we both took turns making out with her while running our hands over her body and tits, as she wasn't wearing a bra. Then we both lay on either side of her on the bed, touching her all over, kissing her neck and making out with her. He put his hand between her legs and I could tell her had started fingering her, as she was moaning and gyrating her hips while I made out with her. Eventually she got so horny that she was begging to be fucked, so she moved around into doggysyle position so he could stand on the edge of the bed and fuck her while she sucked my dick. He was pretty nervous, so he took a minute to get himself hard before fucking her, however once he going, he was giving it to her really fucking hard, so she was moaning really loudly while trying to suck my dick. This was my favourite part- watching my sexy girlfriend being a naughty little slut right in front of me.

The downside was that once they tried to switch positions, he lost his erection and couldn't get it back, so he ended up leaving shortly after that, which is when I enjoyed reclaiming her and reconnecting.

Our main takeaways from the experience were that we decided that next time we would meet the guy out for a drink somewhere first, as it was too nerve racking and risky having the guy come straight to our house without meeting first (we didn't want to push our luck every time). We also learned that I did indeed enjoy watching her have sex with someone else, and it wasn't just a fantasy.

Since then we have had three more threesomes - two of them in particular were really amazing experiences, so I will post about them later.