What A Witch Wants by Monette Michaels

Magical artifacts can be deadly…or seductive, and Amethyst St. John delights in them all. She’s curator for the U.K. Covens’ Magical Artifacts Library, and her magic isn’t the usual run-of-the-mill hocus-pocus. Oh no. With her powers, she can turn the nastiest artifact harmless.
Unfortunately, her magic is useless when her egotistical mother pressures her to marry a depraved aristocrat. So, when the most powerful witch in the world asks her to present an artifact—a very intimate piece of the infamous wizard Merlin—to their sister city Assjacket, West Virginia, Amethyst jumps at the chance.
Bobcat Shifter Kerr Montgomery, chief detective for Assjacket, has better things to do than meet some British ambassador witch … until he catches Amethyst’s scent. She’s his mate—the one woman who can complete his soul. But his Ammy doesn’t understand mating. And she distrusts men. Even worse, she won’t be in Assjacket long enough to change her mind.
And then someone steals Merlin’s intimate body part. Ammy, aided by Kerr, sets out on a quest to find the artifact. In the process, she discovers what she really wants.