In the dimly lit room, the brother's hand wraps around his stiff cock, giving it a firm, steady stroke. His sister, unable to resist the allure of his massive member, joins in, her small hand barely able to encompass his girth. They stroke together, their eyes locked, their breaths syncing. The room fills with the sound of their wet, eager strokes, the scent of sex heavy in the air. They push each other closer to the edge, their bodies tensing as they finally find their release, their cries of pleasure echoing in the room.