Everyone on this board seems to miss the point in this
I think the main thrust of the story is not the lesbian aspect (which seems like a dirty old mans brain-fart) but the wanting of something that miss g could not have, having been trapped at the school all those years. Just as the children were in awe of miss g at the start, she was in awe of fiamma and her experience when she herself is almost a recluse with wild made up fantasies.
I think the subject of this film (lesbian teacher student antics at a boarding school) was always going to take over the main theme and I suppose that is the main pull and initial appeal anyway - mainly to dirty old men. Hence why the longest thread on this board is what constitutes lesbian rape. I refer to the fifth word of this post.
My views are not that well mapped out but seem to be the only actual thoughts on the story in this place.