Dark Crescent Sisterhood Trilogy by Anna Windsor

Gorgeous flame-haired Cynda Flynn knows fire-its heat, its power, its magic. A fully trained Sybil warrior priestess, Cynda's weapon is flame. But she's unprepared for the passion ignited by Nick Lowell, an undercover cop in the NYPD's Occult Crime Unit. He's half human, half demon, and hotter than hell, with fathomless black eyes that ignite something buried deep inside Cynda, making her melt in all the right places.

Luckily, Nick has found a way to control his dark side, but he's done it old-school-through steel-willed self-control. And after five years working secretly within the deadly Legion cult, he's unbreakable. Or he was, until Cynda came along. Now it's personal-and even his big bad love may not be enough to halt a terrible new evil snuffing out fire Sybils like Cynda. It's nasty. And if it can't be stopped, they're all going to fry.

Bound By Light (BK 3):

As the broom end of her Sibyl triad, Merilee Alexander has the sacred duty as a warrior of taking out the trash. Lately, though, she's been a little overwhelmed: Manhattan is a mess. And her prophetic end-of-the-world nightmares aren't helped by the waking fantasies of love. Or the fact that the object of her affections, gorgeous Jake Lowell of NYPD's Occult Crimes Unit, is playing it so cool.

Actually, Jake wants Merilee desperately, every luscious inch of her. Still, he's holding back. He's got secrets. Dark, dangerous, demonic secrets. But as Jake and Merilee trawl the city's supernatural underbelly to out a demonic kingpin who, disguised as a charismatic leader, is amassing dark power, it's make-or-break time. For their lives, their love, and the world are about to be sucked into the undertow of the tides of an unstoppable evil.

OVERALL OPINION: Each book in the series just gets better. The girls are all strong and complicated. The boys are all dangerous and lovable. This is one of the best series I have read in a while.