Small and pathetic.

Over the next few minutes, she totally reworked your body. All the exercise you'd done went out the window as she lowered your muscle mass. She reduced your height to 4'8", making you more than a foot shorter than her. Your facial hair disappeared, then a weird feeling on a couple other spots of your body made you realize that you'd lost all your body hair, from your armpit hair to your pubes.

"There," said the professor. "Your age is still the same, but you look like a little kid now. If you're going to act like a child with a toy, then you can be a child! Have fun experiencing life with an adult libido but a body that no girl would ever touch. In fact..."

She turned up another slider, and suddenly you were hornier than you'd ever been.

"There. After you've spent a few days too horny to think but too weak willed to talk to a girl, we'll discuss how it feels to be manipulated without consent." She handed you back your phone. "I can't steal your property, so I'm giving this back to you. However! You'd better not use it! Resist the urge to mess with people until our next class on Friday, then I'll change you back if you've learned your lesson. Understood?"

"Yes, ma'am," you respond. You pocketed the phone and left.