Unbeknownst to their devout parents, two sisters, haunted by religious guilt, sneak into the sacristy after hours. They fall to their knees, not in prayer, but to unzip their brothers' pants, revealing throbbing cocks. The sisters, their bodies trembling with lust and fear, begin to confess their sins while slowly sliding their tight, untouched vaginas along the lengths of their brothers' penises, seeking forgiveness through the taboo act.