Center of Gravity by Lynn Hagen

Jimmy is a simple kind of man who lives in a low-rent apartment, works from home as an accountant, and has enough clothes that he could open his own store. What he doesn’t have is that special someone in his life. He’s so lonely that he frequents Grizzly’s just to get out of the house. But little does Jimmy know he has a secret admirer, one whose intentions could turn deadly.
Ethan has been interested in Jimmy from the moment he laid eyes on the little leopard. Getting with Jimmy wasn’t easy, but now that Ethan is in his life, he realizes Jimmy needs protection. Twice Jimmy’s apartment has been broken into, and Ethan isn’t taking chances on a third. But a killer is on the loose, leaving bodies all around Mercury. It’s up to the bounty hunters to find out who the killer is while Ethan races to save his mate’s life.