Crystal is a flirty and naughty schoolgirl in Professor Knotz's class. Professor Knotz keeps her after class for extra discipline measures. To teach her to pay attention in class, he ties her to the punishment stool in the corner of the classroom. After stuffing her mouth and taping it shut to keep her quiet, he administers some more punishment and leaves her to think about being a better student in class.

Crystal is a flirty and naughty schoolgirl in Professor Knotz's class. Professor Knotz keeps her after class for extra discipline measures. To teach her to pay attention in class, he ties her to the punishment stool in the corner of the classroom. After stuffing her mouth and taping it shut to keep her quiet, he administers some more punishment and leaves her to think about being a better student in class.