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In his cramped studio apartment, a young medical student can't concentrate on his textbooks. His mind wanders to explicit fantasies, his cock tenting his sweatpants. He gives in, pulling out his throbbing member, and begins to stroke. His hand, slick with lube, glides up and down his shaft, his breathing growing ragged. He pinches his nipple, sending jolts of pleasure to his groin. With a final, desperate thrust, he comes, his cum painting his chest and the open biology book.