Bored in the house, a brother and sister find themselves alone, each to their own devices. The brother, in his room, begins to stroke his growing erection, his eyes closed, lost in thought. Unbeknownst to him, his sister, in the hallway, overhears his rhythmic movements and curiosity piqued, decides to watch. Through the slightly ajar door, she sees her brother's cock in his hand, his face contorted in pleasure. She watches, her own hand inching up her thigh, her panties dampening. Just as she's about to join him, the sound of their mother's car in the driveway sends them both scrambling to hide their actions.