Emily's Curse — Dee J. Stone

For Emily Wright, turning fifteen changes everything. Because that's the night she begins her transformation into a monster.

A curse placed on her family hundreds of years ago leaves Emily destined to morph into a half-snake creature with only one intent: to kill. Desperate for a cure, she and her best friend Toby search for answers. What they discover is that there's more to the curse, which might explain why every member of the male species suddenly lusts for her -- and why Toby stares at her in a way a best friend shouldn't.

As the serpent side battles to take over, Emily races to find the cure before she claims her first victim.