Defy You by Diana A. Hicks

Zack needs a fake fiancée.
Rebecca needs a green card.
Will pretending to love him for a whole year break her heart for real?

After a long volunteering stint in South Africa, hot shot doctor Zack Cole is ready to move on with his life and get his residency job back. At his brother’s engagement party things take an unexpected turn when he finds himself kissing a beautiful guest.
With a bad case of mistaken identity, a passionate kiss he can’t stop thinking about, and a marriage proposal, this gorgeous stranger turns his carefully constructed world upside down.
Former cartel accountant turned spy, Rebecca Smith is desperate to stay in the states; returning to Venezuela would be a death sentence for sure. Her only hope is for the steamy doctor to accept her twelve-month deal.