The heroine, usually an honor student, is trained into a body that can't do without a cock! The overbearing younger sister is slowly being hunted down, the protagonist, who she hates, gets his dirty dick in her uncircumcised pussy. She is sobbing with a strong climax after being cum inside of her! He repeatedly and irresponsibly performs Nakadashi as a cum toilet to relieve his daily frustration of being mistreated!