Sweet Mercy by Lynn Hagen

After surviving an abusive relationship, Mercy takes refuge at his stepbrother’s ranch. He has been living there for three years, trying to put his life back together. In walks Ford Bowers, a stunning man who makes Mercy’s heart race. But he doesn’t trust men, not even when Ford comes to his rescue for a flat tire. Not even when Ford fronts Mercy the money to start his own business. Some things are just too hard to get past, especially when Mercy’s ex-boyfriend shows back up in town.

Ford knows Mercy is his mate from the moment he steps from his truck. The problem is, Ford is working undercover to catch a maniac vampire. He’s been hired at the ranch, only because Ford doesn’t want to draw any suspicion to himself. He isn’t even sure he wants to stick around. He’s lived his life as an Ultionem mercenary and setting down roots isn’t in the cards for him. Only, the longer he’s around Mercy, Ford isn’t so sure he can simply walk away.