In the dimly lit room, a brother and sister find themselves alone, their eyes wandering over each other's bodies, curiosity and desire stirring within. She watches, licking her lips, as he grows hard, his thickness straining against his pants. He catches her staring, his cock throbbing at her hungry gaze. She reaches out, tentatively touching his bulge, feeling the heat and size of him. He lets out a low growl, pushing into her hand, as she begins to explore his forbidden, delicious thickness.