Class is interrupted.
(Click on the image for larger size.
Invisible Girl, Heroine: Chapter Three, Page Thirteen written and commissioned by Dr. Faustus of EroticMadScience.com and drawn by Lon Ryden is published under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.)
More of the women-in-prison trope!
Image found at the tubmlr Creepy by Design.