Intern teacher caught by student masturbating

Arina is an intern teacher at a high school. She is the homeroom teacher of a class of students who are very individual and difficult to tell. She often yells at the children, so they are looking for ways to retaliate against her. One day, when she arrives at school and enters the locker room, Arina discovers a tool for masturbation, which is a vibrating egg. It was deliberately placed in front of the locker by a student to trap his teacher. And then she picked it up and took it to the bathroom to masturbate. Seeing that she had trapped them, secretly filmed her teacher, masturbated and then used it as a thing to force her to have sex with them.