Hidden away in a cramped closet, two siblings struggle with their repressed desires. The sister, haunted by religious guilt, tentatively reaches out to touch her younger brother's innocent but impressive manhood. Their father's distant voice commands them to remain still, but the siblings can't resist the primal urge. As they slowly descend onto each other, lubrication and lust take over, leading to a frenzied, taboo encounter and a cascade of post-coital guilt and shame.