Bored siblings, Michelle and her stepbrother, find themselves alone together one afternoon. Michelle retreats to the bathroom, her curiosity piqued by her brother's recent growth spurt. She tentatively touches herself, her fingers tracing circles around her clit. Meanwhile, her brother, excited from a shower, bursts in on her, catching her mid-act. They argue, but later, they return to the living room, Michelle openly masturbating as her brother strokes his thick, long cock. She fantasizes about his cock filling her, but their moment is interrupted by an unexpected visitor.