Some Cowboys Brave the Flames by Natalie Dean

Charlie Keagan has always been the one to stand on her own, but facing her old insecurities isn’t easy—especially when it comes to Mason “Ash” Ashton, the rugged smokejumper who disappeared from her life after a single, unforgettable kiss. Ash was her brother’s best friend, the one guy she could never have… but also the only one she ever wanted.
Now, years later, Ash is back in town, filling her thoughts with memories she’d tried so hard to bury. He’s still just as protective, and that fire in his eyes still sparks whenever they’re together. But with the danger of his job—and her brothers watching their every move—Ash knows better than to get involved with the Keagan family’s youngest.

But staying away from Charlie isn’t as easy as it sounds. Because some flames refuse to be extinguished, no matter how hard he tries.