Capricorn

This Supernatural fan fiction introduces a new monster, one of the deadliest the Winchesters have ever fought. Along with this new foe comes the girl who has been fighting them her whole life: Ellie Harper, a childhood best friend of Jo. She's confident, charismatic, bitingly sarcastic, and quickly wins over both Sam and Dean. They soon set off on a hunt to kill the creature before it kills her, and tension builds in the process. Though she has an immediate connection with Sam, will she be able to resist Dean's advances? With their help, will she finally be able to kill the monster hunting her, and avenge the death of her parents? Plot twists, classic characters, sexual tension, and a badass woman, all in one book, the first of a series of 12.