Brute Alien Assassin. Brute Alien, #19

Marcus was a paid killer and a half-breed, part Earth human and part Decortian, a species of large, muscled, handsome alien breed humans. With a reputation for being ruthless yet cunning, he navigated the shadows between worlds, never quite belonging to either. Marcus preferred Decortian females over human women. So, when Louis Bantini, the CEO of a large interstellar munitions company, commissioned him to eliminate his wife, he thought killing a human female would be just another hit.
The fee was staggering and hard to pass up. He'd killed women before, but that was in combat; this was different. Suddenly, the stakes were personal, and Bantini's motives reeked of jealousy and revenge, not survival. Marcus took the assignment; it would be easy, a long-range shot to the head would be quick and painless. But that wasn't what Bantini wanted; he wanted more, a kidnapping and torture.
Marcus agreed until he saw Eva Bantini. From that moment on, nothing went as planned. The instant their eyes met, Marcus felt the world shift, and the job he thought he could control started slipping through his fingers. Book 19 of the Brute Alien Series. Romances that are out of this world.