Taboo threesome?

When I was first dating my wife and her sister was single, they would joke with me about making me into a sister sandwich where we’d all be together in bed with me in the middle and them making out with me. I was always too scared to call them on it and try to make it happen because I was scared it would make my gf mad. But they were both joking about it. I really wish I would have pushed the issue. What a fun experience that would have been. But it never happened. Just teasing. 😆
 
Not sure if this topic has ever been covered, but has a couple ever been in a threesome where the third person was one of their brothers or sisters? Not where they both actually had sex with the 3rd but where one did and the other had to be a spectator?

Years ago my wife and sister were good friends, and both were very outgoing and loved to dance together. We partied a lot, drank a lot, but went our separate ways each evening (no hooking up for the girls).

After a couple of years my sis disappeared, and another couple of years later my wife hooked up with a close friend.

For some reason it wasn't until just recently that I wondered what would have happened if my wife had wanted to hook up with her first close friend, my sister? My sis is hot, so I wouldn't have objected at all. Would i have watched (definitely, if they didn't object)? Would i have joined in making sure to steer clear of sis?

The idea is so intriguing that I started a story, but it is the first story I have zero experience in - i have very little idea how some of the parts will unfold. Does anyone have any experience they’re willing to share?

How about a threesome with two of your female cousins (sisters)?
 
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