A Druid of Her Own - Druid Series, #4

Immortal, seductive, able to shift into a wolf, and a downright sinful highland warrior, Kennard O'Caha has had only one mission for the past several centuries-find and destroy the dark sorcerer Athol. Now that the job is done, it's time to park his motorcycle, kick up his boots, enjoy a few drinks, and possibly find a honey to warm his bed for a night. After all, nothing quite refuels the magik like pleasure.
That was the plan, anyways. Too bad life had something else in store for this magikal biker bad boy. When a stubborn redhead is set in his path, it's all he can to do to keep from instantly claiming her-his mate. Evil has its sights set on his woman and he's not about to let her go without one hell of a fight.