In the dim light of the sacristy, two sisters, bound by blood and forbidden desire, undergo a grim ritual of verification. Their father, a stern priest, watches as they undress, their bodies trembling with anxiety and arousal. They're to prove their purity, yet the act demands impurity. Michelle, the elder, takes her brother's virginity with her mouth, tasting his innocence as she guides him into her. Her brother, hesitant at first, loses himself in his sister's warmth, thrusting into her with increasing fervor. Their bodies slap against each other, the sound echoing in the silent church, as they defy their faith and each other.