Lords of Vice Series by Robyn DeHart

Iris Bennington is furious when she discovers her younger brother is following the instructions found in the acclaimed advice columns on How to be a Gentleman. The so-called "advice" is more likely to turn her brother into a scoundrel than a true gentleman. Iris decides to locate the author of the columns and confront him. Merritt Steel, the Earl of Ashby, cannot help but be amused by the slip of a woman who comes calling... moreIris Bennington is furious when she discovers her younger brother is following the instructions found in the acclaimed advice columns on How to be a Gentleman. The so-called "advice" is more likely to turn her brother into a scoundrel than a true gentleman. Iris decides to locate the author of the columns and confront him. Merritt Steel, the Earl of Ashby, cannot help but be amused by the slip of a woman who comes calling. Unwilling to let such a delightful potential conquest go, he proposes a wager: bring him anyone off the street and he can pass them off as a gentleman. It's a bargain she readily accepts—but with a twist. Their bargain proves to be a greater challenge than either anticipated. Merritt finds it near impossible to keep his hands off Iris, and she begins to see the undeniable appeal of ungentlemanly behavior… less

As a Lady of Virtue, Matilda Brooks swears to reform the most despicable man of her acquaintance, her brother-in-law, Sullivan Chase, Viscount Glenbrook. Well he may not be the most despicable, but he is certainly arrogant, flirtatious, and entirely too charming. To make matters worse, he has the irritating tendency to poke fun of her and rile her emotions as no other man does. However, when she confronts him, he laughs off her concern about his slothful ways... moreAs a Lady of Virtue, Matilda Brooks swears to reform the most despicable man of her acquaintance, her brother-in-law, Sullivan Chase, Viscount Glenbrook. Well he may not be the most despicable, but he is certainly arrogant, flirtatious, and entirely too charming. To make matters worse, he has the irritating tendency to poke fun of her and rile her emotions as no other man does. However, when she confronts him, he laughs off her concern about his slothful ways.But when a carriage accident forces Sullivan to play knight to Tilly’s damsel, his unexpected act of chivalry ends up costing them both their freedom. Her compromised reputation and his honorable declaration forces them into a marriage neither of them wants. Which is most inconvenient, given that she has sworn to despise him forever. less