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He's supposed to be studying, but his mind wanders, drifting to the forbidden. His hand creeps into his pants, finding his hard cock, throbbing with need. He's a good boy, always has been, but today, he's craving something different. He imagines her, his best friend's sister, her laugh, her smile, her curves. He strokes faster, his heart pounding in his chest. He's never done this before, never let his mind go this far, but he can't stop. He's close, so close, his body tensing, his cock pulsing. He bites his lip to stop his cry as he comes, his hot seed spilling over his fist, his mind filled with the shameful, delicious taboo.