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For this prompt on the due South Kink Meme:
"due South, F/K, V/K - begging - Fraser and Ray have an arrangement; if Fraser's away in Canada, Ray can play with other people. The person Ray usually goes for is Vecchio, because Vecchio will make him beg for it first. (Would prefer no angst, just a happy F/K open relationship with a friends-with-benefits Vecchio!)"
I bent the prompt a bit, because the F/K relationship ended up being a little bit fraught (at least that's how Vecchio chose to understand it), and Vecchio brings his own post-Vegas angst to the party. But everyone's basically okay with their current relationships: Fraser/Kowalski and Vecchio/Stella Kowalski, with the two Rays having hall passes.