Gakuen no Ikenie: Nagusami Mono to Kashita Kyonyuu Furyou Shoujo.

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. (This OVA is based on the adult game by Erectlip.)