Cloistered in their nunnery, Sister Mary and Sister Catherine struggle to maintain their chastity, only to be tempted by their own hands and each other's bodies. One fateful night, they discover each other's secret masturbation sessions, igniting a forbidden desire that consumes them. Their first tentative touches escalate into a frenzy of virgin flesh and taboo lust, as they defile their holy sanctuary with their sinful, forbidden love, seeking absolution in each other's arms.