Bound by Shadow (The Dark Crescent Sisterhood)
Falling for a demon can be hazardous to your heart.
Riana Dumain is a fully trained Sybil, a warrior priestess battling evil whose practical magic keeps her grounded in earthly science–and desires. She knows that gorgeous NYPD detective Creed Lowell is dangerous, and possibly a foot soldier of the evil Legion cult, using his badge and drop-dead looks to consolidate demonic power.
Bound by Flame (The Dark Crescent Sisterhood)