So, I previously shared the story of the first time my ex-wife and I experimented with sharing:
https://old.reddit.com/r/gonewildstories/comments/badf0f/the_first_time_my_japanese_exwife_and_i_branched/
As you can gather from how much we enjoyed it, we did not stop there. Still, for almost a year, it was always her having sex with another man privately, and me just hearing about it and seeing pics afterward. Finally, on a trip back to the US, I ended up sharing her with another old friend of mine who was completely up for doing stuff with all of us there in the room together.
For me, it was brain-meltingly hot, and like the last story, it was another major line crossed in exploring that side of sex.
Obviously it wasn’t a spontaneous thing. He had heard the stories from my other friend, and we’d talked about the idea of passing her around the group in the leadup to that visit home.
By that point we’d been there for probably a little over a week, and she’d already been with with my other friend (the one who had visited Japan and fucked her) and two other friends of mine who’d been asking for a turn with her for months, continually checking when we were going to visit.