The Master

Mia and Ian made the perfect match. However, Ian's been keeping something from his wife. He has a fantasy, which has Mia being pleasured by another man. When a woman's scream breaks the silence of the evening, and Mia and Ian see a mystery man fleeing from an adjoining garden, Ian suggests that Mia go and assist him in finding an escape route. Neither she nor Ian count on this man being a rake, a thief, and hiding jewels and a map on Mia's body as he seduces her.
Ian knows he has found the perfect man for his plan. With a little persuasion or even blackmail, he could be persuaded to accept their offer. Simon Duvall has a few secrets of his own, one being his specialty is ménage a trois. Soon the couple learns he knows all sorts of tricks about pleasuring a woman and a bedroom suited for doing just that. There is another mystery to him as well, including secret meetings and being called away suddenly.
Whatever and whoever he turns out to be is of no consequence for Mia, who quickly learns what it is like to be under the Master.