Driven - The Berenger Brothers, #1

A man with barricades guarding his heart. The woman whose love can knock down those walls. For Eric Berenger, the family business is where he's worked all of his adult life and it's all he knows. He doesn't have time to waste on his personal life. The last thing Eric needs is a workplace romance. But when he meets Cassidy Nolan, a businesswoman who comes to his company with an intriguing proposal, he's instantly attracted to her. Cassidy Nolan has built her company from the ground up.
Now she's ready to expand if she can get top venture capitalist Eric to take a chance on her. One problem. He was her high school crush who kissed her senseless one night. A night she'd like to forget as he clearly has. Seeing him again doesn't make it easy. Thrown together for a common goal, they form a bond that threatens all Eric believes in and doesn't think he can change. If he can't, he'll lose the woman he loves.