Seven Nights with the Duke by Alyssa Clarke

Miss Elizabeth ‘Lizzy’ Fairbanks cannot forget a few abandoned moments with Rannulf Headley, the Duke of Ravenswood. Their romance had begun by accident until it ended when she discovered they were worlds apart. Now that her brother is the new Earl of Celdon, the very bad Fairbanks have been trying to behave themselves and fit into London society. Lizzy is determined not to be tempted by Rannulf, but the duke wants nothing more than to make her his. However, Lizzy is torn between her desire for the duke and the knowledge that he could never make a lady with her reputation his duchess. Undeniably, the duke is a dangerous temptation Lizzy could not resist…until she realizes how perilous it is to her heart to have accepted his wicked bargain.