After the Rain by Cynthia Knoble

When Kit falls for the wrong woman, it spells disaster for more than just his heart.
Elizabella Hathaway is in a rut. With lagging sales, the romance author needs a fresh start and focuses on a new direction with her writing. She chooses Heartland Getaway Ranch to do her research, never suspecting one of the owners, Kit, would be so darn handsome. Could the hot cowboy possibly be interested in her though?
Kit Carson can hardly believe such a beautiful woman is staying at the ranch. She’s engaging, intriguing, and sexy. She’s exactly his type—oh Lord is she—but there’s a problem. He and his brothers have a pact not to sleep with ranch guests. It’s so hard to resist her but he must. He’s made a promise to his brothers and can’t break it.
One stormy night ignites a passion neither can resist. Their secret union does more than warm Elizabella’s jaded heart. It causes a rift between the close-knit Carson brothers and threatens to tear them asunder. When an accident leads to distrust and heartbreak, Elizabella makes a decision that could ruin more than the Carsons’ livelihood. Already at odds, the brothers are in for the fight of their lives. When it rains, it pours, and Kit and Elizabella are caught in a tempest.