She cheat with his sister, he with her brother

LupusDei

curious alien
Joined
Jul 3, 2017
Posts
4,098
As title says. We have four, apparently at least to same extent bisexual characters, involved in a twisted unfinished square, with possibilities. Let's say, Alice and Bob (her fiance), Alice's brother Arnold, and Bob's sister Cindy.

Like...

Alice is shy and at least slightly submissive. Cindy is very confident and outgoing and win Alice's admiration easily, then even more (not sure who initiate it), but it's Cindy who drags Alice out into "society" and all kinds of "cultural" events as concerts, theater, exhibitions (with opening afterparties) etc, while Bob is not exactly interested in all that. He's happy his two most important women get along so well and is totally blind to that relationship having taken inappropriate turn, at least for now.

Arnold is the older (alternatively, younger) of the four, while other three are about same age (perhaps college, or just out of college, but that's not a given). He and Bob find a common passion (say, in certain kind of cars) and end up spending a lot of time (and money) together on that. Somehow, they end up exchanging escalating sexual favors (this may or not be necessary explored "on screen"). Alice, likewise, remain oblivious of it happening.

Arnold however, he may not have definitive evidence, but he's at least suspicious of Cindy's and his sis relationship being more than it "should" be. Even though he's not in high opinion of Cindy, he's rather intrigued than appalled though; said suspicion may even serve as catalist for him approaching Bob with his own suggestions.

Cindy, likewise, she see changes in the guys involvement, and she can't stand Arnold either... or at least, that's what she thinks.
 
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What a tangled web we weave!

Could make for a good story. But it will take skillful telling to avoid confusion for the reader. I had to read your post three times to make sure I understood what you were suggesting.
 
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