A no-strings-attached arrangement should have been easy.  Except he can’t seem to stay away from her.     AJ Foster has loved Cord McKay her entire life. From the moment he'd rescued her after falling off her horse, she’d imagined the tall dark and handsome man as her very own prince charming. But even now that she’s an adult, past pigtails and ponies, her sexy, grumpy neighbor ignores her.   Divorced rancher Cord McKay is committed to two things: his young son and the family ranch. He has no time for women—especially not his little sister’s best friend who has grown into the definition of female temptation. Besides, the thirteen-year age difference between them means he’s too old for her . . . right?   But one reckless night, AJ suggests a secret summer fling and Cord can't resist, as long as she abides by one rule: he’s in charge. Nothing could have prepared innocent AJ for the dirty-talking, growly cowboy whose hidden sweetness is as addictive as his expert touch.   As the summer ends, stubborn Cord believes he can withstand AJ’s efforts to break through his defenses, but AJ is determined to win the single dad’s heart no matter what it takes.