Elijah by Jacquelyn Frank
They are called the Demons, one of the elusive Nightwalker races living in shadow and struggling for survival against their human enemies. Their proudest warrior is Elijah, a man who bends for nothing and no one...until one woman brings him to his knees...
Some Feelings You Just Can't Fight
He is known as the Warrior Captain--a master of every weapon, a fierce soldier sworn to protect his kind. Powerful, relentless, merciless, Elijah has always won every battle he's ever taken on--until now. Ambushed by necromancers, he is left for dead only to be discovered by the woman who could very well deliver the final blow...Siena, the Lycanthrope Queen.
With three centuries of warring, little more than a decade of uneasy peace has existed between the Lycanthropes and Elijah's people. Now, after a lifetime of suspicion, the warrior in Elijah is consumed with a different battle--winning Siena's heart by giving her pleasure beyond all boundaries. What starts as attraction and arousal soon burns into a passion with consequences that will echo through the ages for both their people. And as would-be enemies become inseparable lovers, another threat approaches, one with the power to destroy them all...
Surrender to the night.