House-sitting a mansion for the summer sounds easy, right? Until my rich, single dad neighbor catches me in a compromising position. Hint: I'd just taken off my bikini top. He's billionaire Ethan Carter, a living legend in the tech world and father to two adorable little girls. Oh, and he's the kind of ruggedly handsome that belongs in a calendar with firefighters and puppies. "Welcome to the neighborhood," he...