Villainous Hearts by Scarlett Snow

Everyone loves to sin but only the villains embrace it.
After turning a jerk’s manhood into stone, Zara is sent to the Academy for Villains—a place where troublemakers must atone for their sin or risk burning in the Underworld forever. It’s also where Hades claims she’s his reincarnated wife, bad boy Loki of Asgard is determined to seduce her, and the Prince of Darkness wants to turn her into his new vampire bride.
Zara might be surrounded by villains, some of them devilishly sexy, but they have no idea what she’s capable of…and she has no idea what secrets lurk in the shadows waiting to tear her world apart.