Would this be your reaction?

Though the age of the boy is a major issue, another aspect is that a teacher is in a position of authority over her/his pupils, and to embark on a sexual relationship with someone who is under one's authority is an abuse of power. There will no doubt be plenty of nudge nudge wink wink jokes made about this but I see it as no more acceptable for a pretty young female teacher to have a sexual relationship with a male pupil than it is for a handsome young male teacher to have a sexual relationship with a female pupil.

I agree with other posters, though, that the mother seems unduly hysterical about it, and publicly airing her own grievances in such a hysterical manner doesn't seem to me to be the best way to support her son. On top of no doubt feeling embarrassed about the exposure of this relationship in the media, this young man may now feel that he is partially responsible for "ruining" his parents' lives.

The knowing what people should or should not do comes before they fall in love. When I was young I consciously avoided getting too close to anyone where I could see the relationship would cause problems. Teachers known what the rules - and the temptations are, so they should be in a position where they can protect themselves from inappropriate emotional involvements with pupils.

I think there is always a space of time when it is possible to pull back and put the brakes on any relationship. Especially in a school setting! Even if a line has been crossed on a Monday you can say no on Tuesday!