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The creaking floorboard gives him away, but it's too late. She's already seen enough. His sister, frozen in the doorway, takes in the sight of him, naked and panting, his hand still wrapped around his glistening cock. Embarrassed, he quickly covers himself, but the damage is done. She's seen the extent of his late-night activities. "I-I'm sorry," he stammers, but she just shrugs, a small smile playing on her lips. "Don't be. Just... be quieter next time, okay?" And with that, she leaves, leaving him to his private, late-night pursuits, his heart pounding with a mix of mortification and newfound exhilaration.