I think that while you are serving your Mistress, you should watch me putting my collar and leash on your hot wife and teaching her how to serve me. Her smooth pussy lips (as show in the first set) would look fantastic sliding down the length of my dick, and those soft breasts would fit beautifully into my hands as I take her doggy-style.
From your vantage point (under your Mistress) you could watch me control her body with the leash as I enjoy each of her holes in turn. I will tell you what I think of each part of her body and particularly enjoy informing you of how wet her pussy is, how soft her mouth feels licking her juices off, then how tight her ass is as I fuck her deep and have her calling me "Master". [I don't expect any verbal response from you, as it is rude to talk with your mouth full]