Yukiko Ishihara, a teacher at × school, has decided to live as a sex slave for a certain man. As proof, she has a nose ring like a cow. She hides the nose ring with a mask and teaches children. Initially, the nostrils were small, but now they are stretched enough to hang a padlock. Yukiko's body modification is not just the nose ring. She has piercings on her labia. A steel toy weighing nearly 1 kg is hung from the piercing to stretch the labia. Her nipples are also enlarged and stretched, now as big as a baby's penis. Her anus is still under development, but she can do AF, and she will undergo further expansion training with thicker objects. Usually, a padlock is attached to the labia piercing as a chastity belt, and the key is owned by the master. The video consists of daily training scenes and group orgies with guests. Additionally, a slideshow of photos sent together is included as a special bonus. Before purchasing, please note that this work is a play submission video shot by an amateur SM enthusiast. There is no acting, staging, or storyline typical of AVs. It is a raw and obscene visual record.