"Pious Flesh" finds siblings confined in a closet, their religious upbringing clashing with their carnal urges. Michelle and her brother, both virgins, struggle with their desire. Michelle, haunted by guilt, pushes her brother's massive cock inside her, their moans echoing in the cramped space. Their father's stern voice echoes in their minds, but their bodies betray them, lubricating their forbidden union. As they fall into a passionate, shameful rhythm, they collapse, spent, amidst smeared juices and fluids, praying for absolution from their taboo lust.