Claiming the Wolf by Michele Hauf
Werewolf Christian Hart thought he missed the action of battling vampiresuntil an encounter with vampiress Danni Weber. She bites him during their fight, the worst fate imaginable for a wolf. His pack would banish Hart forever if they find out. Nevertheless, Hart finds himself drawn to Danni, his sworn enemy, a woman he knows is as deadly as she is beautiful.
Then the blood hunger hits. Hart refuses to harm a mortal, even as his desire for blood and sex becomes too overwhelming to fight. His solution: turn to Danni to satisfy his cravings