Price of the Executor by Alisia Price

When Vivienne Ashford inherits the crumbling Blackwood Manor, she discovers the estate demands a wicked inheritance tax: three nights of absolute submission to the mysterious executor. Isolated within decaying walls and surrounded by her ancestor's sins, she must surrender her pride—and her body—to a man who knows exactly how to break her. Behind locked doors and leather-bound volumes, depraved secrets awaken a hunger she never knew she possessed...