About a year or so into our relationship my wife(then girlfriend) took our very first vacation together. Our travel arrangements had to be changed at the last minute so we decided on hedonism in Jamaica as neither of us had ever been there before. We had no expectations and hadn't really talked about boundaries yet either as our relationship was fairly new. We knew the subject could come up and we were both open to the idea of swapping/swinging but hadn't truly discussed it at length.

On the first night there we kept to ourselves mostly, finding a hidden hot tub that was away from the main pool area. We made our own fun until calling it a night after a long travel day.

The second night at the dining area we met a couple and started chatting. After some small talk we told them about the hidden hot tub we had found. We made plans to meet them there later that night. We both arrived at about the same time and stripped down. My GF was sitting to my right and she was next to the female half of the couple. After a few minutes the vibe between the four of was good and I was feeling a little horny thinking back to the events from the night before in the same hot tub. I reached over to play with my GF's clit but was too late. There was a hand already there pushing mine away. The other female gave me a little smirk and continued playing with my GF's pussy under the bubbling water. We continued taking for a bit before all of us decided to cool off in the main pool. The four of us sat around the edge of the pool saying nothing about what was going on in the hot tub. The other couple excused themselves and began to leave but not before whispering their room number in my GF's ear. We sat at the pool a bit longer not really sure where the night was headed. We made the long walk back to our room without saying much about our invite. Once back in our room it didn't take long for my GF to call the couple on the hotel phone and tell them we'll be right over.

On the walk over we talked a little about boundaries and I said that I didn't think I was ready to watch her have sex with another guy yet. ( We had talked about our fantasies and desires many times before but this was the first time it was a distinct possibility). We agreed that she would play with the female half only as my GF is bisexual. We got to their room and it was agreed that that the girls would play with each other and that was good with us. It didn't take long until all four of us were naked on the bed.

I have to admit watching my GF on her back with another woman licking her pussy was a sight I instantly became addicted to. I began sucking on one of my GF's breasts while the male half was on the other. After a few minutes they girls switched positions and now I was watching my GF returning the favor. It didn't take long for me to get behind my GF and slide my rock hard cock into her pussy. Listening to both girls moaning was incredible and the view from my end was even better. I honestly don't remember what the other guy was doing but eventually my GF wound up on her back as I continued fucking her as best I could and trying not to cum too quickly and ending the night early. The other couple was beside us fucking and at some point my GF reached over and took the other girls hand and put it in my cock as it was going in and out of her pussy. It didn't take much longer before I had to cum having a strange hand on my cock as I was fucking my GF. I pulled out and cum shot out everywhere from my excitement landing on my GF's arm, tits and her cheek but the most landing on the headboard behind her. The other girl licked my cum off my GF as I began apologizing over and over for the mess I made on the headboard. I collapsed on the bed and we watched as the other couple continued fucking right next to us. At one point my wife put my hands on the other girls tits as she rode her husband. They continued until he came on his wife's back doggystyle.

At this point I was still embarrassed by the amount of cum I spilled all over the place and felt that we should leave as I had no idea if I had broken some swinger etiquette or not. In hindsight we should have stayed and played longer and who knows how far we would have gone. We left their room and my GF and I were so horny from the experience that we barely made it back to the room before fucking again. We slept a couple hours , woke up and fucked again repeating this at least 4 more times.

Sadly this was the only time this happened although my GF told me later on that the wife was interested in a second round with us.

Since then we've a few [MFM] and [FMF] experiences but we're still waiting and looking for the right couple to take things further.