In the dim light of their shared room, the siblings succumb to their forbidden curiosity. The brother, hesitant yet eager, presents his rigid cock to his sister. She tentatively wraps her fingers around it, feeling its heat and pulse. As she begins to stroke, they find themselves lost in the rhythm, their gazes locked, the outside world fading away. The room echoes with their hushed breaths and the wet, slick sounds of her hand on his flesh.