So the sensei warning her against relationships with students was in a relationship with a student herself?
Hmmmmm.
Yes, she warned her to keep a lid on it until student comes of age. Apparently, such advice was disregarded.
Kurogane Ken did a better portrayal of such a relationship, yet he had a whole series to flesh out the story. This two parter is fap material... I didn’t get ages of characters in story, but working in lingerie store says something. I doubt there will be a sequel to this.