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In the hushed tones of a late-night study session, Zhang Xu leans over his student's desk, his hand guiding hers as they work through a complex problem. Their fingers brush, and he feels a jolt, like the derivative of a function approaching infinity. He looks into her eyes, seeing not just a student, but a woman. She blushes, biting her lip, and he's lost, his mind filled with equations of desire, his heart beating in a rhythm far removed from the ticking of the classroom clock.