She has to take off her panties when the teacher's not looking

Beatrice's command rang in Sana's ears, but she tried not to think about it, if she glowed too bright, too early, everyone would be watching her.

Thankfully, the teacher, Mr McKenzie, had been told about her condition, so he didn't make her introduce herself in front of the class. She was allowed to quietly take her seat and wait through attendance.

After a few minutes of explaining how to graph the area under a curve, Mr. McKenzie turned his back to start writing equations on the chalkboard. As soon as his back was turned to the class, Sana felt her hands moving on their own.

She'd worn a modest skirt today that went well past mid-thigh, but now she was hiking it up all the way to her waist with no control over her actions. She felt her skin heating up as she began to blush and glow. Soon it would be bright enough that all the students around her will surely notice.

She hooked her thumbs through the waistband of her panties and lifted her butt off the chair to slide them down. Her skirt must have stayed hiked up in the back because she could feel her bare ass on the seat. She was glowing brightly, then, and he could hear and feel numerous heads turning in her direction. As quickly as she could she let her panties fall to her feet where she snatched them up and balled them into her fist.

Just then, Mr. McKenzie turned back around, he too, noticed the light.

"No powers in class!" he said, harshly, but then he noticed who it was and his tone completely changed. "Oh, sorry, Sana, I didn't know it was you."

"Hey! That's not fair," another of the girls in the class said, "how come the new girl doesn't get in trouble for using her powers in class? Why should she get special treatment?"

"It's because Sana has no control over her powers. She can't help it when she glows so we'll all have to cut her some slack."

Sana groaned inwardly, she wished Mr. McKenzie hadn't told everyone that. Now it was only a matter of time before everyone figured out what made Sana glow.

"Now," Mr. McKenzie continued, "who would like to come up and solve this first problem?"

"I'll do it," a voice said behind her. Sana immediately recognized Beatrice's voice.

As Beatrice made her way up the aisle between desks, she dropped a pencil right next to Sana. As she crouched down to pick it up, she touched Sana's knee and whispered: