«Immortal Moon» by June Stevens Westerfield

Anya Moon only has one personal rule: don't date vampires. She never dreamed the price for breaking it could be her life.In his five hundred years as an assassin, Jarrett Campbell has never gone beyond a one-night stand with a woman. As a vampire, he knows a lasting relationship with a Norm is out of the question. But Anya Moon is just too intriguing to pass up. A two-week fling can't hurt as long as they both know how it will end … right?Caught up in a romance he never expected, Jarrett forgets that his life as an assassin is never safe … especially when one of his past targets returns from the dead. Now he is in a race against time to save Anya. But is her life worth his death?