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Savannah has kept the class behind after college because of how disruptive you have all been, she wants you to keep your heads down and get on with the work you should have finished in the lesson. You find it very hard to concentrate though when you realise you can see straight up her skirt from where you are sat, when Savannah look sup and sees you perving on her panties she surprises you by teasing you and silently instructing you to take your cock out and wank.