Every Last Breath(Dark Elements‪)‬

Every choice has consequences-but seventeen-year-old Layla faces tougher choices than most. Light or darkness. Wickedly sexy demon prince Roth, or Zayne, the gorgeous, protective Warden that she never thought could be hers. Hardest of all, Layla has to decide which side of herself to trust.
Layla has a new problem, too. A Lilin-the deadliest of demons-has been unleashed, wreaking havoc on those around her, including her best friend. To keep Sam from a fate much, much worse than death, Layla must strike a deal with the enemy while saving her city-and her race-from destruction.
Torn between two worlds and two different boys, Layla has no certainties, least of all survival, especially when an old bargain comes back to haunt them all. But sometimes, when secrets are everywhere and the truth seems unknowable, you have to listen to your heart, pick a side-and then fight like hell.