Predator by Liz Meldon

BLACK SOUL, SUFFOCATING IN SILENCE
Severus: demon, incubus, escort–leech. After centuries of scorn from his own kind in the underworld, Severus went topside and settled amongst the secret demon community in Farrow’s Hollow. Located near a hell-gate, the city allows him to exist on Earth without sacrificing much of his demon abilities, but as with all incubi, he must take the life essence of humans to maintain his strength.
Working as an escort, he has been able to keep himself satiated, juggling enough clients to ensure that he doesn’t repeat the mistakes of past incubi–the murderers, the gluttons, the true demonic leeches.
In his line of work, Severus sees much of the same every night: human women searching for surrender, for a connection, for love. He caters to them, steals from them, not realizing that he’s desperate for all the same things.

BLUE EYES, WATCHING HER WORLD FADE AWAY
Moira Aurelia: grad student, TV-marathoner, bar trivia champion–unable to look in a mirror. Not anymore. Because when she does, she no longer sees herself. The person, the creature, staring back isn’t her. It can’t be.
Hair, skin, eyes. Nothing is the same as it once was, and no one can tell her why. Despite her fears that she might be dying from the same mysterious illness that killed her mom two years ago, Moira finds herself getting stronger, too, her senses sharper. Terrified by the lack of control she has over her own body, she retreats, withdrawing from her once active university social life.
After unsuccessfully searching for answers, a frustrated Moira goes after the one thing she can control: her sex life. Twenty-three and still unable to experience a satisfying climax, she schedules a session with Russ Tanner, highly recommended male escort, and hopes for something to go right for once.

LIGHT AND DARK COLLIDE–DESPERATE TO CONNECT
But the night takes a turn from the moment they meet. Severus, expecting just another dull session with a new client, is thrown by the otherworldly creature seeking his services–this strange, beautiful woman who arouses his long dormant demon side like none other. Moira, meanwhile, finds herself face-to-face with a man who can handle her newfound strength–and wears a dark stare and sinful smile like a second skin.
Two lonely creatures grapple with the undeniable pull between them.
Moira flees. Severus pursues.

Desperate for answers, the demon seeks her out–unaware that he isn’t the only predator to have caught her scent.