The Billionaire’s Lie by Ashley Zakrzewski

Matteo’s rough personality puts a damper on those around him. His girlfriend broke up with him right before he proposed and the thick walls he put up, as a result, keep people at arm’s length. Now his sister is getting married, and she is nudging him about his plus one. Lying was the easiest decision.
Lacey agreed to pretend to be Matteo’s girlfriend for the week-long trip only so she could pay off her impending tuition. She would be set if everything went well. If not, she wouldn’t get a dime.
Living a lie for a week shouldn’t have changed them forever, but when the island gets hit with a hurricane forcing them to spend the day along together, Lacey realizes Matteo has a whole other side to him.
Can they pull off the lie without any hitches, or will it all come crashing down?