All Night with a Rogue

It wasn't as terrible as some say it was. The premise was dynamite, but the execution was lacking; there should've been more buildup between our couple. At the end of the book, I'm not really sure why our Hero is so besotted with the heroine. What changed the cold-hearted libertine who agreed to ruin a young girl's reputation to a man only devoted to one woman? We don't know.