Chichi Ijime Bakunyuu Shimai Kyouentan

Orie, a rookie English teacher, and Kotone, a high school student, are sisters. They are beautiful and have big breasts. Their father is the president of their school. One day, Georg comes back to Japan from Europe. He is their father's secret son and his purpose of return is to take revenge on them. At first, he fools them by being gentle, but he gradually shows his real personality....