The Billionaire Next Door (The O'Banyon Brothers)

Take-no-prisoners deal-maker Sean O'Banyon ate Wall Street financiers for lunch. So why was he losing sleep over a fresh-scrubbed nurse in old jeans and a too-big T-shirt? Maybe it was those warm green eyes. Or the way she blushed when he got personal. There was no denying the serious chemistry between them. But sooner or later Lizzie would learn his deep, dark secrets: First, he had trust issues. And second—he'd rather not go into the whole family thing.

He didn't do relationships…but amazingly, Lizzie made him want one anyway.