I'm A Voracious Reader : historical romance

Joan Bennet has endured four Seasons without a single suitor or serious flirtation, let alone a marriage proposal. She's had just about enough of being a respectable wallflower and is giving serious thought to embarking on a life of sin, or at least a lascivious adventure like the ones described in a popular scandalous book. When she meets her brother's favorite drinking mate, Viscount Burke, it seems her hopes of adventure might be answered . . .

Tristan Burke doesn't want a wife, and one can't trifle with a friend's sister without risking marriage. Even more, Joan's the last sort of woman he would ever choose: Droll, sharp-witted, and always unfashionably dressed. If only he could stop thinking about her mouth. Or what she might look like without those horrid clothes. Or the way he can only win an argument with her by kissing her senseless . . . even though that just makes him want her more. But more could lead to a betrothal, which he fears - or does he?