The toys come out.

With Tia (the real Model) getting licked out by Cherry (your enslaved 'Model'), the Mistress is left out...for a few seconds.

She removes her panties and gets behind Tia (near her bound hands), telling her simply 'Finger me.'

She obeys.

To your knowledge, Cherry was just Madison's platonic friend/roommate before you met her.

Now she is a well-trained lesbian who is your bondage slave for videos and photo shoots.

She shows her experience by driving Tia to orgasm in short order.

The Model asks to cum and is granted permission by her Mistress, who removes her top to boot.

The Mistress has only just begun though.

She puts a dildo-gag on Cherry's face and presents Tia to her again.
This time, however, she is told to fuck the Model's asshole!

Surprisingly, this was not something you did. She just is an actual slut who likes anal.

The Mistress keeps raising the stakes by planting her pussy on Tia's face.
She has to earn that dildo in her ass!

Showing self-control, the Mistress grabs a vibrator and uses it on Tia's pussy, surprisingly not too distracted to multi-task.
That's why she makes the big bucks.

Tia cums hard- twice.
She's loud, even muffled by that pussy.

The Mistress cums once, but it is a good one.

As the duo disentangle, only Chery does not cum.
Even if she could complain with her mouth full, however, she wouldn't.