Bottle Rocket by Erin McLellan

Freshly single Rosie Holiday is on the hunt for passion and excitement. This leads her to Leo Whittaker—a bad boy who waltzed out of town, and her life, thirteen years ago. Leo isn’t the type to stick around, but Rosie’s not going to let a no-strings opportunity pass her by.
When a business trip sends Leo back to his hometown, the last thing he expects is for his first love to hand him a list of scorching-hot escapades and a deadline. He’s happy to help Rosie discover her bossy side in the bedroom. Or in a fireworks stand. Or at a Fourth of July barbecue.
Their chemistry burns bright and fast, but what tore them apart years ago is still between them. They are polar opposites. A reserved kindergarten teacher and an irreverent artist. A nester and a wanderer. It will take a spark of imagination and a lot of love to keep their second-chance romance from flaming out.