Unbeknownst to their parents, a brother and sister find themselves alone in the house, their curiosity piqued. The sister, a beautiful young woman with a hunger in her eyes, notices her brother's growing erection as he walks past her. She bites her lip, her own desires stirring. They're both aware of the taboo, but the tension between them is palpable. She reaches out, tracing the outline of his cock through his pants, feeling it twitch at her touch. He hesitates, then gives in, pushing her hand away to unzip his pants, his hard cock springing free. She licks her lips, eager to taste her brother's forbidden fruit.