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The bathroom's steamy, his cock's hard, and all he wants is a quick wank before bed. But as he steps out of the shower, he realizes he's not alone. His step-sister's there, her eyes wide with surprise - and something else. She's masturbating, and she doesn't stop when she sees him. Instead, she watches, licking her lips as he covers his big dick with a towel. "Join me," she whispers, her fingers still moving, and he can't help but obey, his hand wrapping around his thick cock, stroking it slowly as she watches, her own pleasure growing with each stroke.