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In the dimly lit study, the sister reflects on her brother's growing appeal, his muscles filling out his shirts. One evening, she catches him jerking off in the living room, his huge cock throbbing in his hand. She watches, captivated, before he notices her. Instead of fleeing, she confesses her lust, sliding her hand up his thigh. He's hesitant, but she's insistent, guiding his hand to her pussy and grinding against his fingers, whispering, "I've always wanted to know what it's like to fuck my big brother."