Sadie and Her Cowboy by Paige Tyler
When a ruthless cattle baron is determined to do anything to get his hands on Sadie Buchanan's ranch, including running off her ranch hands and killing her cattle, she hires the infamous gunslinger Jake Wagner to protect her property.
Despite the fact that they butt heads right from the start, Sadie is helplessly drawn to the ruggedly handsome cowboy, even when he warms her bottom repeatedly for her willful and sometimes reckless behavior.
But all the cards are put on the table when Sadie bets the cattle baron that she, Jake and her small band of cowpokes can get more cattle to market than anyone in their right mind would attempt.
It's all or nothing for Sadie, her ranch and the dangerous cowboy she's fallen for hard.