FIC -- Quatrain: A Song In Four Voices (SPN, Sam/Jess/Gabriel/Kali sedoretu)

Summary: Squaring up is hard to do - moreso outside of the species. Gabriel wants to get married, properly married, with two wives and a husband all properly aligned. And all he needs to do is get Sam and Jess to let him, a sub-adult blue, into their relationship, and then find a suitable red-moiety female angel who'll agree to the arrangement. Simple, right?
Wordcount: 25,140
Notes: Thanks to hannah for lots of patience and excellent beta'ing, and to kdheart for a gorgeous cover image.

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or at AO3