G-Cup Sisters! ~Imouto Darake no Sakunyu Gakuensai by Marigold (Jap)

Sister who was Bettari brother from an early age, admission aligned three people to his alma mater of his brother. Then, when the brother is appointed as a teacher, Burakon the first time that always come to Bettari in this blessed and just in commuting to and from school as well as within the school from getting up. But, whether the growth was all gone to the chest, boobs though height is not growth is growing up to G cup of extremely big tits. Burakon action is all that has not changed from an early age for his, had gotten so inflame the desire of as a man. One day as a brother, as a man, school festival has been approached while facing the complicated feelings for his sister. At the Sokai was left until after school, sister of Himari comes doing with tears.