My favorite fictional couple would probably be Lyssa and Jacob from Joey Hill's Vampire Queen series. But my true favorite if I can be unconventional for a moment is not necessarily a couple, but a threesome, also from the Vampire Queen series, Daegan, Alwyn and Gideon. In both relationships, there is a dynamic interaction between vampire and human, Dominant and submissive. The relationships are complex and deep, and continue to evolve with each book. These couples are provocative and edgy, have with plenty of tension, and always keep me breathless.