Eternity Embrace (Demonica #4.5)

Desire...

Demon slayer Andrea Cole has always taken down the demons and vampires she hunts without mercy. But when a fellow slayer is captured and turned into a vampire by a sadistic monster, she must choose between loyalty to her family and the man she loves.

Versus Instinct...

Kaden Quinn has dedicated his life to slaying vampires, so when he is turned into one, his greatest nightmare comes to life. And when the woman he loves is thrown into a dungeon with him -- as food -- he must battle new instincts and old desires, and choose between his life, and hers.

Fantasia