Hard and fast!

Donna is tied standing as she faces her Stepmom.
Freshly-fucked, the past tense-MILF watches you increase the brunette's predicament.

More ropes are put on her, making her bent more forward.
Her normal gag is replaced with a ball one.
Nipple clamps are put on her, hanging a chain between them.

You start to fuck Donna!
She moans.
She cums.

You tell her to beg for more, but she can't do it with the gag in.
As a punishment, you put weights on the chain, increasing the pain in her nipples.

You start to fuck her again!

She cums two more times before you're done with this position.
To your surprise, Dee managed to cum without being touched!

As a contrast, you move her to a sleazy-looking, cheap mattress on the other side of Dee's current residence.

She is tied in a ball position and her gag is removed.
You tell her to beg for more.
She complies.

You take her hard, yet again!
Since she's a dirty slut, you take her asshole this time!

While you recover from all of the fucking, you enact the next part of your devious plan...

Separating the pair, you tell them that they will experience sensory deprivation of all but sound.
The only noise they'll hear is a woman being punished and fucked as a ****.
They nod in submission as the blindfold and gag are placed on and the tiny earbuds go in.

Donna is tied 'standing' to a Sybian...

...while Dee is tied tightly with a vibrator stuck to her clit.

Of course, you don't tell them who the woman is being punished...