"Yes, Master."

She utters those two words as silently as possible, so as not to reveal her identity. You smile.

With your left hand, you bring several stinging spanks down on Donna's tight ass.

"1, 2, 3, 4, 5. Thank you, Master," the brunette says, stopping the licking only for a moment.
"So well-trained," you say with a smile, looking at the others, "Here is your reward."

With your right hand, you grab Jenni's head and lift it up, pushing it into her step-sister's pussy. She licks it with passion, vigor and excitement!

Jenni isn't a great pussy licker, but she is surprisingly-good. It is then that you remember her history as a submissive lesbian ****.

Being tied up and eating pussy is just like riding a bike for this slut.
She just needs to do it again to remember how.

Moments later, that is confirmed...

"May I please be allowed to cum, Master," Donna says submissively, before resuming her task.
"You may."

Donna cums with a strong sadness to her voice. She wanted to cum, but also, deep down, can't stand what she has become. That will pass and she'll eventually just be your **** fully.

Less than two minutes later, another request to cum- also from Donna.

"Oh God, may I please be allowed to cum again, Master?"
"Two orgasms? For that, you have to take 10."
"Yes, Master- please OOH give me 10."

You pull Jenni's face back for a moment, seeing her eyes staring at you lustfully, and spank Donna ten times on her ass again!

"1, 2, 3, 4, 5, 6, 7, 8, 9, 10 OHHH Thank you, Master."

To your surprise, Donna squirts all over Jenni's face...even though you hadn't put it back in to let her keep licking pussy yet! She got off on the spanking (and being **** to call them out)! Interesting.

That's all Jenni needed to set her off, especially since Donna's tonguing got even more intense as she got close.

"You may cum, slut," you say, staring at her soaked face.

You cover Jenni's mouth, but it still does little to mask her orgasmic cries. She's a bit of a screamer! Even so, this one was more intense than before.

Donna is pulled back away from Jenni as she recovers and you await Donna's next statement. She knows to thank you for letting her do this.