Her Billionaire Cowboy by Jewel Allen

When billionaire cowboy Trey Johnson runs for Congress, he turns for campaign help to Jess, the girl he’d crushed on in high school but was too shy to tell. Unfortunately, she’s still off-limits because she’s nursing a broken heart.
Marketing maven Jess Oliver is happy to work for her friend from high school, Trey, who’s surprisingly turned into a rugged hunk. The campaign works too well—she starts falling for him too. With election day looming, do they dare admit their true feelings before they lose their chance at love?