Deadly Is The Kiss

Description for DEADLY IS THE KISS by Rhyannon Byrd:

Tasked with protecting humanity from harm, the last thing Ashe Granger was searching for on his mission was his destined mate. Then, a mysterious dark-eyed beauty reluctantly offered him shelter. A spark of danger -- and a soul-deep recognition -- ignited a burning, carnal need....

Since her family's exile, Juliana Sabin had borne full responsibility for their safety. So when evil struck, she had no choice but to ally herself with the sexy guardian vampire. Now, months later, Ashe is back and tempting Juliana to reveal her darkest secrets...and desires. For the killer stalking the shadows isn't acting alone -- and he won't rest until his deadly cravings are fulfilled.

This is #1 in Primal Instinct World Series.