A scientifically-minded professor

Crystal frantically tried to pull down her tshirt to cover the tramp stamp tattoo on her back, the one that said "YOUR WISH IS MY COMMAND" and marked her as any man's plaything, but it was no use. Her skimpy tshirt wouldn't go any lower, and her hip-hugging jeans wouldn't go any higher. Anyone who saw her would know she was theirs to command.

"You know," Dr Turner ruminated. "This brings to mind a theory I've been meaning to test."

The college girl looked warily at her Psych professor.

"I've noticed that the skimpiness of girls' clothes at college always seems to change in waves. There's a girl that wears the sluttiest thing possible, and then the other girls seem to feel freer to show more skin and wear attractive, slutty clothes -- after all, they don't have to worry about being too slutty. Are you following?"

Crystal nodded numbly.

"So I wish you spend the rest of your time in college wearing the skimpiest clothes possible. Unfortunately, toplessness is illegal in our town, but I look forward to seeing you attend my class in bra and panties or a bikini. And, of course, I look forward to seeing what the other girls wear as a result. Got it?"

Crystal nodded again. Her hands were already moving to pull off her jeans. She wiggled her cute ass out of the tight pair and stepped out her shoes right in front of Dr Turner. Standing barefoot and in a pair of white bikini-cut panties, she tied her tshirt just under her boobs. Her swollen, pierced nipples stood out through the thin fabric.

Dr Turner nodded approvingly. "Very nice. You have the perfect body for our little experiment. I'll see you in class tomorrow, hopefully in less clothes." He walked off, seeming pleased.

Crystal rubbed her arms. Her back tattoo throbbed in its invitation to command her, exposed utterly in the expanse of back between her panties and her shirt. She walked barefoot to her next class.