Gilded Cage - Femme Surnaturel, #1

A f/f paranormal novelette... Since her turning, Elena Csintalan has wrestled her inner demon on a nightly basis. She never expects her limits to be tested-until she finds herself drawn to a tawny woman whose lush curves make her eyeteeth spike. Before she knows it, she's dangling inside an iron cage, one that's frighteningly familiar. And the punishment she endures is oh so divine.Despite a surprising empathy she feels for the vampire she's captured, Cassia proceeds with her coven's plan-drain Elena of her blood at the height of orgasm to complete a potion that will protect them from Elena's maker.
Cassia scried the darkness coming their way, and the monster has a name.the Countess Elizabeth Bathory.