Based on the adult game by Erectlip. A priest kidnaps a girl and wants her to abandon her friends and join his religious cult. When she refuses, the cult members administer divine punishment by nipple-fucking her. Her friend comes in to save her, but gets ass-fucked instead.
Gakuen no Ikenie: Nagusami Mono to Kashita Kyonyuu Furyou Shoujo 学園の生贄 慰み者と化した巨乳不良少女