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Framed as a lesson, this video is a masterclass in restraint and taboo. Mr. Zhang, the epitome of propriety, slowly unravels the mysteries of calculus, his voice a low, steady drumbeat in the students' ears. Yet, beneath their school uniforms, their bodies betray them, nipples hardening, pussies dampening as they struggle to focus on the chalkboard, their minds consumed by illicit thoughts of their teacher's "formulas" and the "equations" they'd like to solve together.