The governess game / Tessa Dare.

"He's been a bad, bad rake--and it takes a governess to teach him a lesson. The accidental governess. After her livelihood slips through her fingers, Alexandra Mountbatten takes on an impossible post: transforming a pair of wild orphans into proper young ladies. However, the girls don't need discipline. They need a loving home. Try telling that to their guardian, Chase Reynaud: duke's heir in the streets and devil in the sheets. The ladies of London have tried--and failed--to make him settle down. Somehow, Alexandra must reach his heart . . . without risking her own. The infamous rake. Like any self-respecting libertine, Chase lives by one rule: no attachments. When a stubborn little governess tries to reform him, he decides to give her an education--in pleasure. That should prove he can't be tamed. But Alexandra is more than he bargained for: clever, perceptive, passionate. She refuses to see him as a lost cause. Soon the walls around Chase's heart are crumbling . . . and he's in danger of falling, hard." --