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The stepbrother's big dick tents his pants as he sits in the passenger seat, the car humming along a quiet street. His stepsister drives, oblivious to his predicament. He can't help but touch himself, his large hand wrapping around his stiff cock. He thinks about her, about how she's always been off-limits, and how that only makes him want her more. He jerks off quickly, quietly, his cum splattering onto the car floor as he bites back a moan, leaving him spent and guilty in the aftermath.