As the power goes out, siblings huddle together in the dark, the sudden blackness amplifying their heartbeats and breathing. The brother's hand accidentally grazes his sister's thigh, igniting a spark of electricity that rivals the storm outside. They freeze, then lean in, their lips meeting in a tentative, innocent kiss that quickly deepens into a passionate, tongue-filled exploration. Their bodies press together, hands roaming, as they give in to the primal urges that have been building between them, their clothes becoming barriers they're eager to shed.