Phoenix Force (3 Book Series)

From Book 1:

When a mission gone wrong kills his best friend, navy SEAL Matthew Parker will stop at nothing to destroy the demons who threaten his team. To do so, Matt must locate a mysterious orb before the demons use it to destroy the world. But the only woman who can help him—Sienna McClare—has her own agenda…and every reason for hating his kind.

A half blood, Sienna hopes returning the orb to her people will gain her acceptance back into the only family she's known. But working with a Draicon werewolf like Matt comes with a high price—one that could cost Sienna her dreams.

A natural-born leader, her werewolf lover must now teach Sienna to listen to her heart—and go where their all-consuming passion leads them….