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The classroom is filled with the scent of chalk and desire as Professor Zhang's lesson on microdifferentials takes a sinful turn. His students, hungry for more than just mathematical knowledge, begin to undress, their young, eager bodies pressing against each other. The professor, unable to resist the temptation, joins in, his hands exploring the soft flesh of his students. The room echoes with moans and gasps as the class engages in a forbidden, taboo act, the chalkboard filled with the equations of their lust, a testament to their carnal education.