Yukiko Ishihara, a teacher at a 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. The nose hole for the nose ring was small at first, but now it can hang a padlock. Yukiko's body modification is not just the nose ring. She has a piercing on her labia. And she hangs a nearly 1kg steel sex toy from the piercing to stretch her labia. Her nipples are also enlarged and stretched in the same way, and now they are as big as a baby's penis. Her anus is still being developed, but she can do AF, and she will be trained to expand with even 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 and group sex with guests. [Before Purchase] This work is a play submission video shot by an amateur SM lover. There is no acting, staging, or story like AV. It is a raw and obscene video record.