The brother's strong hands knead the sister's back, her skin prickling with anticipation. As he moves lower, her breath catches, and she arches her back, silently begging for more. His fingers trace the curve of her ass, then dip lower, brushing against her wet, hungry pussy. She gasps, her body trembling as he slowly pushes a finger inside her, her tightness clenching around him. He adds another finger, fucking her slow and deep, his thumb circling her clit, driving her wild with taboo desire.