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The young man's hand moves rhythmically, his breath hitching as he nears release. His eyes are closed, lost in his own world, when a sudden gasp breaks his concentration. His sister stands there, her eyes locked onto his cock, a mix of shock and curiosity on her face. "I-I'm sorry," she stammers, quickly averting her gaze. "I didn't mean to... I just needed a book." Left alone again, he takes a deep breath, trying to calm his racing heart, his cock still hard and aching.