With the door locked and the world shut out, these devout siblings find themselves alone with their thoughts and their bodies. They begin to touch, tentatively at first, then with growing urgency. The girl's fingers brush against her brother's hardness, causing him to gasp. He reaches for her, cupping her breast, feeling her nipple harden under his touch. Their breaths come in ragged pants as they explore each other, their religious upbringing forgotten in the face of their overwhelming lust. They come together, their bodies slapping against each other, their cries of pleasure echoing in the small space, a symphony of forbidden desire.