The creaking floorboards announce their presence, the siblings freezing in their tracks. "Shh," the brother warns, his hand finding his sister's, their fingers entwining. They're alone in the old house, the weight of their secret lust hanging heavy between them. She bites her lip, her eyes darting to his crotch, where his bulge is evident. He smirks, knowing her gaze is there. Slowly, he undoes his belt, letting his pants drop to the floor. Her eyes widen, taking in his naked form, her mouth watering at the sight of his thick, hard cock.