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The brother, a thick cock straining against his jeans, decides to take matters into his own hands. He unzips, pulls out his massive dick, and begins to stroke it, a low moan escaping his lips. His sister, trying to ignore him, fails miserably as the sound of his pleasure fills the room. She can't help but watch as his hand works his cock, the veins popping out, the head glistening with pre-cum. She feels a familiar ache between her legs and, unable to resist, begins to rub herself through her panties, her own moans joining his, the two of them lost in their own worlds of pleasure.