Your Wicked Ways (Duchess in Love, 4)

Helene, the Countess Godwin, knows there is nothing more unbearably tedious than a virtuous woman. After all, she's been one for ten long years while her scoundrel of a husband lives with strumpets and causes scandal after scandal. So she decides it's time for a change -- she styles her hair in the newest, daring mode, puts on a shockingly transparent gown, and goes to a ball like Cinderella, hoping to find a prince charming to sweep her off her feet...and into his bed.
But instead of a prince, she finds only her own volatile, infuriatingly handsome...husband, Rees, the Earl Godwin. They'd eloped to Gretna Green in a fiery passion, but passion can sometimes burn too hot to last.
But now, Rees makes her a brazen offer, and Helene decides to become his wife again...but not in name only. No, this time she decides to be very, very wicked indeed.