Private masturbation moments turn shared

In the quiet of their shared home, a brother and sister, each unaware of the other's presence, retreat to their respective rooms for private pleasure. He, with his thick, straight cock in hand, strokes slowly, his mind filled with illicit thoughts. She, fingering her wet slit, moans softly, her other hand kneading her generous breasts. Unbeknownst to them, thin walls and open doors carry their sounds to each other, piquing curiosity and desire. As they grow bolder, their masturbation becomes a shared, silent symphony of lust.

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