Sex education of Younger Sister and the Kindan which are a student…. The older brother who works for a school of the Younger Sister as Teacher. Give lessons in Younger Sister during class, and the older brother instills a pleasant feeling in a body of a Uniform figure and the Younger Sister dressed in the SUQQU water by the lesson of the holiday when there is nobody in a health room if he becomes just two of us. The obedient Younger Sister expresses the voice of the woman while burying the meat stick of the older brother who is Daisuki.