Bound in Moonlight — Louisa Burton

For centuries the Castle of the Hidden Grotto, tucked into the French countryside, has provided its guests with a captivating haven where no fantasy is taboo and any erotic dream can be indulged. Seduced into this world by the chateau's beautiful immortal residents, the latest crop of visitors cast off their inhibitions and surrender to their deepest longings....

A sheltered heiress is appalled by the licentiousness she encounters at Chateau de la Grotte Cachee, until a beguiling stranger frees her from her gilded cage by tutoring her in the arts of love.... A rector's daughter, in despair over being ruined and impoverished, allows herself to be sold at a slave auction for one week of sexual servitude to an aristocratic master with unorthodox tastes.... A woman with ancient ties to the castle is forced to confront her destiny--and a passion as consuming as it is forbidden....