Edge of Hunger: Rhyannon Byrd
Book 1 in the Primal Instinct series.
"Ian Buchanan has always felt the unknown—the deep, impenetrable darkness that lives within him. Yet he is determined to lead a "normal" life, ignoring the unsettling dreams in which he succumbs to his wildest desires.… Until psychic Molly Stratton tracks him down, claiming to share his sensual nightmares.
The petite Molly even has the bite marks to prove it. And she's also received a message from Ian's deceased mother: an enemy is near. And it's time for the creature inside Ian to finally awaken. A creature with an insatiable hunger that must be controlled before it overtakes them both…"