Man Cave (On a Manhunt #3) by Vanessa Vale

Book #3 in the On a Manhunt Series

Tropes: Billionaire Hero, Small Town, Grumpy x Sunshine

I'm twenty-four, and ahem... inexperienced.
When a blind date doesn't change that status, Theo volunteers for the task.
Who's Theo? Just the guy I've been crushing on for six months. Yeah, him. Tall, broad and handsome and gah, now he's even got a beard!
He's diligent. Very focused. Skilled. And impossible not to fall for.
Except he's only up for a fun time. A wild romp or two.
No way would he have any romantic interest in someone like me. Why would he? He's an intense, brooding doctor—and, oh yeah, a billionaire—and I'm a goofy first grade teacher barely making ends meet.
When my goal changes from man-made O's to the man himself, I know I'm in trouble.
Because he's no longer a crush, but someone I might actually love.

With all the books in the On A Manhunt series, it’s always open season on men.