We have a couple of dedicated posters on the UK board who will post “Naughty Teacher Alert” threads just like you’ve done. They will even go a step further and go into that teacher’s social media accounts (if they haven’t been locked or deleted) and post photos of the cuckolded boyfriend / husband etc. This is followed by comments on the teachers physical appearance, etc etc.
In this case at this point in my life I would personally pass but if I were back in HS and she showed interest I would probably go along with it.