Not Until The Doctor Says So

"STOP RIGHT THERE," A man's yelling voice boomed from every corner of the room. "TAKE YOUR HANDS OFF THE COCK!"

Sam instinctively took his hands off of his dick and put them in the air.

"Now, Now, Sam," the voice, still booming but more measured, started to sound more familar. "We both know that sort of behavior isn't allowed for you."

It was Dr. Vandersloot.

"Normally I'd send you to work it out in a sex cell, but we're in the middle of an experiment so that would be counter-productive..." He drifted off making a softer and softer hmmm sound, then snapped to attention. "I know! We test your ability to follow orders as your sexual frustration intensifies."

"Oh Mandy," the doctor half-sang, "why don't you come out and make yourself useful?"

The door behind Sam opened and a short, curvy bleach blonde came into view. She turned to face Sam and he got the full view: Big blue eyes behind large, round glasses. A sweet, soft smile. Soft tits in swaddled in a pink sports bra and a thick, juicy ass popping out the bottom of her white velour booty shorts.

"Hiiiiiiiiiiii," she said, taking in the scene. She looked him up and down, but kept coming back to his cock for obvious reasons. It was hard, throbbing — basically ready to explode.

"He looks like he reallllly need to cum, Doc," Mandy said, looking up. "Are you sure we can't just have a little fun and then start from scratch on the next round?" She looked at him and winked in an over-the-top, jokey way.

"No Mandy," the doctor sighed. "Just follow my instructions. I'm sure you'll be able to have plenty of fun before the experiment is over."

Mandy pouted and stomped her foot performatively. "Fine! Let's just do it then."

"Okay," Dr. Vandersloot said. "Mandy turn around and down on all fours."

"Should I take my shorts off!?" Mandy sounded excited.

"No," Dr. Vandersloot sounded like he was starting to lose his cool.

Mandy's face reverted to a pout. She turned around and got down on her hands and knees. She was arching her back, boosting her ample booty out Sam's way. She looked back at him and blew him a kiss.

"Now Sam," Dr. Vandersloot continued, "position yourself behind Mandy. Do not do anything else until I say so."