In the dimly lit apartment, a brother and sister, left alone, find themselves drawn to their reflections in the mirror. As they strip down, they mimic each other's movements, their bodies betraying their growing arousal. She traces the curve of her breast, while he grips his hardening cock, their eyes locked in the mirror. Their bodies sway in sync, their breaths ragged, until the tension snaps. He spins her around, his hands grabbing her ass, her legs wrapping around him as he enters her with a feral growl.