The pubertal Girls which the milk bottle grew girl, Risa who was still growing up, and interest came out to in being Sex. Ask an older brother unconcernedly, and even the question that is Sex always annoys you, but small there where the hair under the So does not grow is developed by an older brother, and learn pleasure little by little. Koko has the brother Ai with slightly precocious Risa and the older brother of the Younger Sister thought.
