Cowgirl Heart by Em Petrova

It’s not easy to impress a Dalton girl…
It’s not easy being a Dalton, let alone the last unmarried one of the Texas bunch. Keziah, or Kizzy, is drained by all the family weddings, and her sisters keep trying to rope and tie her to any old cowboy in the county. To ensure this doesn’t happen, she takes off for the big city and a job as assistant to none other than the smart, savvy and sexy KC Cohen, the mortgage company billionaire who sees her as something more than a cowgirl.
Knox Channing Cohen has achieved his goal—to build his own billion-dollar business from the ground up and without the help of his wealthy family. He’s also managed to break free of his cowboy origins and strike out on his own, far away from the prestigious ranch he grew up on. But when he receives word of his father’s death, he’s back in the saddle… the last place he wants to be.
Kizzy is dragged along as Knox’s assistant to help him deal with the family business. When she learns he’s not only loaded but a damn cowboy too, she can’t be more blindsided. Now she can see all the carved muscle on the man might not be from hitting the gym so much as hard work. Knox wants to sell out the ranch, but seeing the dark-haired, blue-eyed beauty at home around horses has him second-guessing his beliefs about the country… and wondering if he can remind her that she’s a cowgirl at heart.