Leather and Gold (The Masters of Mayfair #1)
Gemma Snow, Rebecca Fairfax

Her lust for Captain Simonnet has not diminished in the past months, instead growing stronger and more potent until she invites him to meet her in the rose garden at midnight. There, she shows the captain all of her secrets, that hidden room, her own desire to cede control, to be taken care of--by him. As she had hoped, Alexandre is familiar with her lifestyle and sets down the rules, before laying her over his lap and giving her all that she most desperately craves--or almost all.
Because despite herself and her raging need, Emmeline knows that her want goes deeper than a salacious affair. She has known Captain Simonnet, William's best friend, some ten years now, craved him for three. Tonight, in the light of their pleasures and vulnerabilities and moments of profound trust, she might just admit to herself that she wants more than a single night or a week or a month--she might just want a life together.