Dangerous (Element Preservers, #1

Eighteen-year-old Ria, a fire elemental and privileged student at the University of Magic, thinks nothing can get in the way of her happiness. But when she starts experiencing the symptoms of magic disease that could rob her of her element and turn her into a cold-blooded killer, the only one who can help her is Adrian, a mysterious, charming, and dangerous magic disease carrier, who also happens to be her least favorite person in the world.