Demon’s Mate by Colette Rivera

Love isn’t for the Fallen.
Ash will never find his fated mate. He lost all hope over a millennia ago. Being alone forever is his punishment for falling to Earth, but as he works to reunite his demon brothers and remain free from Lucifer’s clutches, he’s captivated by a human.
And Ash wonders if he’s wrong.
Harper Nightingale is finally a free witch. Sent to hunt the demons known as the Hounds of Hell, Harper seizes the chance to escape his evil coven. Now, he’s living in Shearwater Landing, disguised as a human, and nothing is more important than holding on to his freedom.
Harper trusts no one and won’t let anyone get close until one night when he’s drawn to a man named Ash and decides to take him home.
But Ash isn’t a man. He’s one of the demons Harper’s been sent to hunt.
Once they meet, Ash can’t stay away, no matter how he tries. Could Harper be his mate? Can a demon and a witch set on hiding their identities ever trust each other enough to embrace a fated connection?