The Billionaire Needs a Wife by Rachael Eliker

Their past is complicated, but that won’t stop them from giving love another shot.
Luke Dorrance has worked hard to be where he’s at, but his grandfather doesn’t see it that way. He’s convinced Luke is wasting his life and wants him to hurry up and marry before the end of the year, or he’s firing Luke and cutting off his inheritance.
It’s not that Lauren’s life is awful, but things aren’t as perfect as she’d hoped. She’s floundering in a dead-end job, she hasn’t had a date in months, and as a Southern girl, she doesn’t mix well with upper Michigan winters. Applying for a new position across the country at the prompting of her friend, Lauren’s excited about the promise of a new start.
Only there’s a surprise that comes with the job—her ex is her new boss.
There’s a thorny history between Luke and Lauren, but their attraction for each other is alive and well. If they want to give love a second chance, their challenges have only begun.