The tables turn again

Ben picked up the pace, feeling his balls clench for a mother of an orgasm.
"Gnnnnnnnnnnn...... OOAHAOAAAA!!!!!!!" Ben lost control, his body thrusting wildly, filling Big Tits up deep into her alien womb. He stayed tensed up until the last of his sperm was done, then he collapsed on top of them, breathing heavily. "Shiiiit... I... oh..."

Suddenly Big Tits and Bitch were on him, pinning him down and ripping the control box away from him.  "Aaah...  get stuffed!" He tried to struggle, but it was useless, his muscles were jelly.

"I believe that we did just...  get stuffed, and now you will return to the role of experiment subject." *click* the collar was back on him.  "That was an unforeseen development in the program.  One we DONT intend to repeat" Big Tits raised a fist and clobbered Ben in unconsciousness.  That was the last he would see of the alien ever again.

He awoke the next morning in his cell.  He felt his head.  very sore.  He felt his neck.  Damn, he was a prisoner again.  He wondered if he would be treated harshly after his escapade last night.

"Hey!  I want to go back to earth now!"

"No, that has been delayed" a voice over the speaker said.  "There was to be a reward for you average level of commitment, however after the previous nights events, this has been modified.  The new phase was intended to be study of physiological pleasure indicators, something we believe you would have found quite enjoyable, however now it will be more psychological, and a study of gender roles.  We had taken a young lady for your enjoyment, but she too has been...  modified"

"What!??  So during the night you just popped back to earth?  Where are we?"

"The Dark Side of the Moon"

"Great!"  Ben angrily settled down on his bed "Pink bloody Floyd."

Later that afternoon Bitch came into his cell.

"Come, experiment will begin soon." Ben got up and followed him out of the cell.

"I really enjoyed last night, bitch" Ben's voice was dripping in sarcasm "How bout you and me ditch the rest of these losers and take off like a bunch of space adventurers!  Me, riding your soft pussy and going boldly where no man has gone before."

"Humor is an inconsequent concept.  You will find no one here responds to it."

"Boring aliens.  Sex is supposed to be fun.  You know oooh aaaah yeah!  You dumb aliens don't get it." He started talking like they did "look at me.  I am an alien.  Please insert your reproductive organ so that I may reciprocate and the copulation may commence.  Yes.  That is correct.  Please push harder.  I feel completion approaching.  excellent, duties completed.  same time next week?"  Bitch ignored the barb.

"This is the room, you will enter here."

"Where's Big Tits?  Always good for a screw, I say."

"The member of our scientific community has been terminated.  Their physical structure was slightly damaged, warranting termination"

"WHAT!?? She gets a bit loose in the puss, and you kill her?"

"It is a standard procedure.  Imperfection is unacceptable.  The termination was a mutual exercise."

"You are some harsh bastards..." he was in shock.

"Enter the room now, the new experiment will begin"