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In the afternoon sunlight, Marcus lies on his back, legs spread wide as Sandra, his sister and mistress, prepares to fister him. She stretches his hole with her fingers, pushing past the second knuckle, then the third. Marcus gasps, his cock leaking pre-cum as Sandra's fist slips inside him. She twists and turns, her knuckles rubbing against his insides, making him squirm. Sandra's other hand works his cock, bringing him close to orgasm before stopping, denying him release. She fucks him with her fist, her arm disappearing into his ass, her voice a low, steady command, "Take it, Marcus. Take it all."