Eventually

"I...I'll do it...," says Sue, "I'll do it...for you, Ann....not for him."
"Thank you," Ann replies happily.
"You won't do it for me," I repeat into the voice changer, "Interesting. But you will do it for her. I guess I gave you the right name then."
"Please don't say that about her," Jen interjects.
"I think that was an order. Someone thinks they can speak up because I already allowed them to cum, huh? Is that it?"
"...y-yes."
"I see. You think that it makes you safe? Well, I have news for you, my Bitch. I can do plenty to you."

Taking slow deliberate steps, I walk around back to her side of the bed. I pause there for a moment, so that anticipation will settle into her brain. After enough waiting, I reach over and pull on the chain going through her nipple rings.

"Ow," Jen exclaims.
"Oh, did you forget about this little thing? Another great little thing left by your so-called-friends last night. I simply must get their numbers."
"How dare y....," Sue starts.
"I heard that, Dyke-Girl. Obviously I made a mistake leaving your mouth free. That error will be fixed momentarily.

While watching Sue's reaction, I spot Ann starting to speak, but holding her tongue. Interesting.

"Bitch, do you regret what you said to me? I hope the answer is yes."
"...yes," Jen replies quickly, the fear of me put back into her.
"Good. Just to make sure of it, let me tell you what I will do if you repeat that mistake. If I am ****, I will tie a rope to that chain and tie the other end to the fan above you. Does that sound pleasant?"
"No....sir."
"I thought not. And that goes for all of you too. Oh and that rope will stay tied to the chain even while I fuck all three of you in the asses, no matter who goes first. Understood?"
"Yes," they all answer quickly.
"I see why your chums picked you. You all make good slaves...eventually."

With that out of the way, I pat Jen on the stomach softly and walk back over to Sue.

"Are you ready now, Dyke-Girl?"
"Yes, I am," Sue answers.
"I'm not convinced. As you know, all of your bodies belong to me. Your faces, breasts, pussies and even asses. That means that you cannot do anything to her without MY permission. Isn't that right?"
"...yes, it is."
"That's right. Now ask for my permission to lick her pussy."
"May I...please...lick her pussy," Sue says with an embarrassed tone.
"No. Ask me nicer."
"....May I please lick her pussy...sir."
"That's better. But still.....no. If you beg me with all of your heart, I will let you do it."
"I don't...know if...I can."
"Alright. Sorry Slut, your pussy won't get any attention today. Too bad Dyke-Girl doesn't like you. She obviously liked Bitch. Do you recall how much she loved it?"
"Yes, I do..sir," answers Ann.
"Thank her for not licking your pussy. You obviously didn't want it."
"Th-thank you...Dyke-Girl."
"Alright," Sue suddenly exclaims, "I'll beg you. I know she really needs it."
"That's a better attitude. Now do it," I say commandingly.
"Please sir, I really want to lick her pussy. I want to make her feel good! Her pussy needs my tongue!"
Hmm....okay."

Satisfied with getting my way, I grab Sue by the back of her head and **** it right into Ann's crotch. While angry, she gets my 'subtle' hint and starts to work on her friend's vagina.