Sweet Hell by Lynn Hagen

Lenox, the demon who stole two millions dollars from Callahan Covetti, still hasn’t been found. Darren decides to take the case and find the demon, for a price, of course. He’s determined to get Cal his money back, until he finds Lenox and discovers the guy is his mate. Now Darren has to protect Lenox from enemies out to steal the money Lenox has stolen. Protecting him isn’t easy, but neither is convincing Lenox that they are destined to be together.

His entire life Lenox has been screwed over. Now some shifter comes along claiming they’re mates. He doesn’t trust Darren, not in the least. Worse, Lenox feels like scum because he really doesn’t want his family found. Not when he has an evil mother and a douche bag brother. Being away from them has given Lenox a sense of peace he’s never felt before. As Lenox and Darren grow closer, there is an enemy out there determined to end them. They have to find out who the guy is before he hits his mark.