Ace — V. Vaughn

Forty-five was not supposed to find Sabine tending bar on Large Lake and still single. Not when she'd known as a small child that she was destined for something much greater. Unfortunately, the recurring childhood dream that had left her feeling as if she was more than an average human had been just that—a dream. After years of waiting for her life to happen, Sabine realized she was trapped in a dead-end job in a town without an eligible bachelor in sight. Until the day Ace walks into her bar. The impossibly sexy man makes her heart beat faster, and she falls hard for the mysterious guy who claims to be a bodyguard. When she learns he and she are much more than they appear, Sabine is faced with the reality of what her destiny was meant to be, and it's not the fairy tale she'd imagined. 

As a warrior for his werebear clan, Ace is bound to take on whatever mission he's assigned, but he never expects to be ordered to convince an unsuspecting human she's his true mate and should become a being she doesn't believe exists. His reluctance to deal with a human disappears the moment he meets Sabine, and he's convinced the task will be easy. But he quickly discovers he's exceedingly wrong. Free will is very much a right that humans can exercise, and for the first time in his career, Ace is afraid he might fail.