All I Know by Tamara Lush

From the author of Constant Craving comes a hilarious story about a woman who feels obligated to care for everyone, a sexy Marine who wants to make his first love his forever bride, and a fake wedding proposal that changes everything.
Kate Cooper has come home to Paradise Beach to help her mom recover from surgery. After all, who else is going to run the family’s tiki bar? A few months on a Florida island won’t hurt her, even if her memories might.
Then Damien Hastings, her high school crush, walks into the bar one night. He’s stunning. Intense. Way more muscular than when they were in high school. And he can’t take his eyes off Kate.
And when Damien finds out that Kate needs health insurance, he does what any gentleman would: ask her to marry him. He’s going to Syria for a year as a military contractor, and he’s loved her for years. It’s the least he can do.
They didn’t return to fall in love. They didn’t expect to have the best sex of their lives. They didn’t plan on a farting dog or a fake engagement.
But strange and wonderful things often happen on Paradise Beach…