Chasing Dragons by Douglas A. Jaffe

Sebastian is the owner of a bookstore café in Hong Kong who provides informal counseling services to an array of offbeat characters. His quiet life is suddenly upended when he meets Chloe, and their relationship takes a startling turn as it begins to parallel that of a pair of mythical dragons from Chinese history. The lovers struggle with questions of mortality and immortality, before a choice is made that pulls them apart.