Unlucky Roommate by Layla Stone

He’s never lucked out.
He’s worked hard for every thing he owns. Which is why he’s deadly possessive.
Kadin’s not nice, and in his line of work nice doesn’t pay the bills.
She hate’s her next-door neighbor. Kadin’s the ruddest person she’s ever meet. She honestly plans her day around Kain’s schedule so they never pass each other in the apartment elevator.
But when Naff, her apartment manager over hears of her latest job, he intervenes in a big way.
As in…Naff negotiates a deal with Kadin to protect her.
She’s never lucked out. And now she has to find a way out of the Demon deal before she murders her neighbor out of principle.