Demon Enforcers Series by Jenn Stark

None of us is without Sin... After serving untold millennia as the leader of a demon special ops team with a brutal reputation for efficiency, Warrick of the Syx has seen it all, done it all, killed it all. Penance for his own damnation? Sure. But with the world running black with blood and magic, his skills are definitely in high demand. This time, though...there's a catch. And her name is Maria Santos. Beautiful, badass, and out for blood, Maria's wrestling with her own dark secrets... moreNone of us is without Sin... After serving untold millennia as the leader of a demon special ops team with a brutal reputation for efficiency, Warrick of the Syx has seen it all, done it all, killed it all. Penance for his own damnation? Sure. But with the world running black with blood and magic, his skills are definitely in high demand. This time, though...there's a catch. And her name is Maria Santos. Beautiful, badass, and out for blood, Maria's wrestling with her own dark secrets. The kind of secrets that call to Warrick's twisted soul. A call he knows better than to answer. Unfortunately, the dangerously tempting undercover cop is Warrick's only ticket into the lockdown hellhole where a particularly vicious demon faction is boiling over, ready to unleash a new Armageddon on earth. If he wants to get at them, he's going to have to take Maria with him. But the second she gets caught in the crossfire between Warrick and the scum of eternity, well... Hell hath no fury like a  Demon Unbound. less

You’re always stronger in the broken places... Angela Stanton has it all—the brilliant mind, the political job that can make a real difference, the townhouse full of strays she attracts wherever she goes. She’s also got a secret that nearly destroyed her when she was a child. A secret she’s buried so deep, it can’t hurt anyone anymore. Until now. Gregori of the Syx, a gifted empath, has avoided all human emotion since he became a demon... moreYou’re always stronger in the broken places... Angela Stanton has it all—the brilliant mind, the political job that can make a real difference, the townhouse full of strays she attracts wherever she goes. She’s also got a secret that nearly destroyed her when she was a child. A secret she’s buried so deep, it can’t hurt anyone anymore. Until now. Gregori of the Syx, a gifted empath, has avoided all human emotion since he became a demon. Now he must convince Angela to trust him with her deepest pain, revealing a truth that could change the role of demons on earth forever. Unfortunately, the intensity of this particular human connection might also shatter what’s left of his soul. But this time, he won’t turn away. Falling in love can utterly end you when you’re a Demon Ensnared . less

The final mission to gain redemption for the Syx rests on the shoulders of a demon like no other... Series finale! Description to come.