Laura, the elder sibling, struggles with her conscience as she watches her younger sister, Maria, undress for their shared shower. Maria's innocent, unknowing display of her naked body stirs something within Laura, a longing she's never before acknowledged. She fights the urge to reach out, to touch, to claim what she knows she shouldn't want. Their father's voice echoes in her mind, 'You mustn't move!', but as Maria turns, her eyes meeting Laura's, the younger sister's innocent curiosity sparks an inferno of pent-up desire, forcing Laura to confront her sinful thoughts.