Class is interrupted.

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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.