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Fetish is open relationships. I like the idea of partners being comfortable with and encouraging threesomes/their partner doing it with someone else and just being happy knowing the one they love is having fun. None of the cuck-associated shit though.
Can't really think of a way to pander to that specifically, closest thing I can think of is two counterpart designs that are destined to be madly in love with each other but spend a lot of time with others. On the plus side, it's a concept that you can apply to just about any design.
