Taste by Kate Evangelista

At Barinkoff Academy, there's only one rule: no students on campus after curfew. Phoenix McKay soon finds out why when she is left behind at sunset. A group calling themselves night students threaten to taste her flesh until she is saved by a mysterious, alluring boy. With his pale skin, dark eyes, and mesmerizing voice, Demitri is both irresistible and impenetrable. He warns her to stay away from his dangerous world of flesh eaters. Unfortunately, the gorgeous and playful Luka has other plans. When Phoenix is caught between her physical and her emotional attraction, she becomes the keeper of a deadly secret that will rock the foundations of an ancient civilization living beneath Barinkoff Academy. Phoenix doesn’t realize until it is too late that the closer she gets to both Demitri and Luka the more she is plunging them all into a centuries old feud.