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 says, grinning.

The catch? He can afford to live here—I can't.

Differences in income and age make anything more unthinkable, not to mention he's coming off a terrible divorce and has no time to himself. We agree we can't be anything more, even as neighborly drinks turn into not-so-neighborly kisses, and kisses turn into... well. Let's just say he finds creative ways for us to use my kitchen counter.

He doesn't know if he's ready to trust again. I don't know if I'm ready to give my heart. But as summer ends, we might not have choice in the matter.