Younger brother, teased by his older sister, goes wild and has sex with her. (MIAA-067)

Nagisa Mitsuori only meant it as a joke, but her virgin brother took it as a real seduction and started having sex with her as soon as their parents left. Even after she had already orgasmed, her brother continued to twist his waist and thrust violently until she reached climax again and again until their parents returned home!