Two siblings, confined to a cramped closet, struggle with their desires. The brother's massive cock tents his pants, while his sister's eyes linger on it. Religious guilt gnaws at them, but their bodies betray their resolve. She whispers, "We shouldn't..." as she tentatively reaches out, tracing the outline of his cock. He gasps, his hips bucking slightly. They're interrupted by their father's voice, "You mustn't move!" but the damage is done. Their secret is out, and so is their lust.