An extracurricular activity that I can't tell my family about—it wasn't written on the 'trip plan'... Koyu Minami Aisei KAWD-640

Only two students remain at the school: Xiaoyu and Aixing… They decide to close the school and go on a field trip with their teachers to reminisce. However, the teachers, unaware of the nature of sex, use sex education as an excuse to sexually exploit the two precocious bodies…