Sister Ginary confronts Chi Chi Medina about rumors she has been wearing a thong under her uniform. Chi Chi denies she is wearing in appropriate underwear but when Sister Ginary lifts up her skirt she sees the truth for herself. Furious with Chi Chi she wedgies her with her thong pulling them so far up her ass they rip apart. The frustrated nun produces a proper pair of underwear for student who reluctantly puts them on. Then it is time for Chi Chi to be punished and to repent. Sister Ginary pull Chi Chi's new underwear over her head into an atomic wedgy and orders the student to pray. Then the Nun puts Chi Chi over knee and spanks her ass red as he gives her a painful wedgie. The sadistic sister continues to punish her student with painful and humiliating wedgies until she promises to never wear a thong again

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