Thank you so much for taking the time to read this!
Me and my wife (Mr & Mrs X) for now have been together for 6 years and during that time our relationship has not opened up to anyone but we do role play and fantasize in bed about other people. These are usually people we know (friends, exes and sometimes just faceless, fictional people). This has been part of our sex life for almost the entire time we have been together. Also for the better part of the past 6 years we have incorporated a couple that I have known for 10 years (Mr & Mrs Y) and my wife has known since we got together. I should also mention that my wife is not as enthusiastic about this fantasy as I am but when I mention Mr. Y to her during foreplay she goes crazy and sometimes even orgasms on the spot. Me and Mrs. X have talked about what would happen if this fantasy ever became a reality and she has agreed to try it out but I feel it's more to fulfill my fantasy even though she is sexually attracted to him. Point is, she is OK with doing it.
Over the years Mr. & Mrs. Y (especially Mrs. Y) have dropped subtle hints and joked about swapping wives but we never acted on it or followed up due to fear that we would freak them out. I should mention that these jokes or comments were harmless and anyone with a diverse enough sense of humor might say it. About a month ago Mrs. Y admitted to me (in front of Mr. Y) that she had a vivid sex dream about Mr. Y, her and myself having a threesome. Mr. Y seemed OK with that and was laughing and saying things like "you gotta have an open mind". Later that same night Mrs. Y and me were texting back and fourth and her dream came up. This opened the conversation and I ended up telling her that we have fantasized about them for quite some time. She admitted that she was attracted to me and knew that Mr. Y and Mrs. X also had chemistry. We even started talking about preference of being in the same room or a different room.
This whole experience has been crazy and we are still feeling things out and talking to our partners and each other. As much as I want to do this I know from reading about this kind of thing that it's very risky. Does anyone have any suggestions or point me towards a thread that I may have missed in order to better understand how to be as safe as possible in this situation?
I should also mention that the 4 of us are not interested in opening up to any other couples. The idea is that we would get together once every few months as we are all very busy and Mrs. X and myself have 2 young children. So this wouldn't be a frequent occurrence.
Thanks again and I really appreciate the information I've been able to gather thus far from this community!