The Imp Act by Vivienne Hart

When his mother summons him home to the family compound, imp Enzo Rossetti knows his days as a Monstrocity playboy are numbered. Though he’s perfectly happy with his life—helping his family during the day and hitting the city by night—his mother has decided it’s time for him to fulfill his family obligation and settle down and get married. With no intention of caving to his matriarch’s wishes, Enzo immediately begins plotting possible solutions.
Enter Noelle Wilson, a newly-minted fashion designer with a lot of skill and even more debt. When she meets Enzo at a club one night, sparks fly, and she willingly signs on for a night of fun. He’s gorgeous, he’s charismatic, and he wants her—why would she say no?
However, she gets more than she bargained for when the crazy imp proposes. They barely know each other; what is he thinking? Turns out, he makes a compelling offer: marry him for a year to keep his mother off his back, and in exchange, he’ll help pay off her debts. It’s too tempting to turn down, so Noelle dives in headfirst. Now all she has to do is make it through a year navigating imp society and trying not to fall for her hot husband.

Seems simple enough, but Enzo has kept a major secret to himself, something he’s known all along: Noelle is his fated mate, and he has no intention of ever letting her go.