Nightblood Academy by Allison West

He made a deal he can’t go back on – one that involves her.
I’m the missing girl who left school with a stranger; the story you’re warned about as a child. Was I kidnapped? Or did I go willingly?
I didn’t listen. I never listen. And now I’m stuck in another universe, protecting my best friend, worried about my sick sister back home, and forced to face the academy bully – who happens to be hot and single. He should be off-limits, but I can’t stop myself from falling for him… hard.