The Wild's Call by Jeri Smith-Ready. This is a prequel story (not a full novel) for Smith-Ready's Aspect of Crow trilogy (Voice of Crow, Eyes of Crow and The Reawakened, also in available an Enriched Edition).
Synopsis
It is seven years after the collapse of modern civilization, and the world is entering a new Dark Age. Can best friends Elysia and Darien trust the animal spirits that are beckoning them to escape into the wilderness and create a new way of life? And will they give in to the mutual passion they've always denied?
Karen
http://booksontheknob.blogspot.com/