"I want to fuck them both in the ass"

I reply.

"Good, you are being truthful." Shirin replies.

I look at her, then at Patti's and Millie's asses in front of me, not sure what to say.

"And is the urge to fuck them in the ass irresistible, or can you restrain yourself?"

"I can restrain myself." I reply.

"Good." Shirin replies. Then: "Ok, moving the experiment on to the next level now."

Patti nods, and her and Millie start to wag their asses back and forth.

I cannot believe what I am seeing in front of me. Two hot MILFs, and sisters, naked in front of me, with another hot brunette with her blouse unbuttoned asking me if I want to fuck them in the ass.

Shirin leaves me to look at Patti's and Millie's asses moving back and forth, then asks:

"What are you feeling now?"

"Same as before." I reply.

"You mean you want to fuck them in the ass?"

"Yes." I reply.

"But you are able to restrain yourself?" Shirin asks.

"Yes I am." I reply, looking down at my cock which has grown rock hard.