Shades of "Story of 'O'" or "Venus in Furs" here for me.
I would love to be seduced into just such a situation, slowly coerced into it as the lady plays on my emotions. "I would love for you to let me tie you to this bed and have you please me while I take my pleasure of your body" and then move on to being left there for a bit, maybe have one of her female friends "pop in" during the middle of a session. The next time, the friend comes in and says there is someone at the door, and she says, "Be a dear while I am gone and keep her company" while the new woman smiles, shuts the door and tells me how she has heard that I am quite the woman pleaser.
Perhaps when my lady comes back, she acts offended to find my tongue in her friend, gets angry and upset, so I beg her to give me another chance. And that's when she says that if I had such a good time pleasing one of her friends, that she wants to watch. Then perhaps the phone rings and she answers the phone while I am pleasing her friend and she begins to describe what is going on, taking delight in my embarrassment while encouraging me to perform better. My lady ends her call and says, "Well, my other friend will be here in a couple of hours, she wants to try you out as well. Make yourself comfortable while we wait" Perhaps some discussion on my technique, treating me like I am not there, "You simply must have him lick your breasts. His light touch on your nipples will drive you crazy." "His tongue is quite good inside, you were right." "He does have a nice cock, mind if I taste it?" "He is useful for more than this, he gives excellent massages" I would say more, but that is more appropriate for AD than here...
But very much the element of emotional blackmail and light coercion to please the Lady would be the best motivation in my mind for this. Throw in some occasional elements of more overt coercion every now and then to keep it interesting, perhaps some toys, maybe some frillys, and that's a great idea for an afternoon/evening/weekend/month long event.
Alas, if only my pocketbook were as rich as my imagination.....
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"Age cannot wither her, nor custom stale her infinite variety. Other women cloy the appetites they feed, but she makes hungry where most she satisfies...."