A close brother and sister, all alone in the world, far apart in age... but when the sister gets married, the brother suddenly changes and attacks her! The sister is suddenly forced to do deep throating by her real brother, and is mercilessly inserted and creampied in her unmarried body! Although she is confused by the possibility of pregnancy, the sister accepts her beloved brother's dick, begs him while crying, "Don't throw it away," and turns into an obedient and lewd meat urinal...!