Great news! The second book in the purchased woman series is titled "Courtesan's Passion."
This is the story of the depraved Lord Dane, first introduced in the novella, Another Lover. This is a full length novel instead, as Dane is a dark and complicated character who is daunted by the light of his new courtesan, Christina Turnbow.
Dane capitalizes on Christina's desperation, turning a single opportunity into a chance to have the beautiful but reluctant woman who fascinates him. He is willing to go to any lengths to keep her when all she wishes is to protect her family from financial ruin.