Sprayed Edge
Trope: Dark Paranormal, Demons & Devils.
 
One kiss could be enough to kill in the first book in the fan-favorite Dark Elements trilogy, from the #1 New York Times bestselling author of the Blood and Ash series. 

Seventeen-year-old Layla just wants to be normal—fit in at school and go out on a real date with the gorgeous Zayne, who she's crushed on since forever. Trouble is, Zayne treats Layla like a sister—and Layla is anything but normal. She's half demon, half gargoyle, with abilities no one else possesses. And even though Zayne is a Warden, part of the race of gargoyles tasked with hunting demons and keeping humanity safe, Layla's kiss will kill anything with a soul—including him.

Then she meets Roth—a tattooed, sinfully hot demon who claims to know her secrets. Though Layla knows she should stay away, it’s tough when that whole no-kissing thing isn't an issue. Trusting Roth could ruin her chances with Zayne—and brand her a traitor to the Warden family that raised her. But as Layla discovers she's the sole reason for a violent demon uprising, kissing the enemy suddenly pales in comparison to the looming end of the world.