1) i'm sure the student in question considers himself quite lucky. I wonder, does he regret bragging about it because of the consequences the other two now face?
2) I feel the teachers were in the wrong. If it really was so important for the three to have sex, I feel they should have waited till he had left school. Age of consent here is only a minor point, I feel. The issue is more that the two were in a position of authority, and they must have been aware of the possible consequences. Had the three met on a dating website or something, I would not take issue.
3) teachers should really treat all their charges equally. Clearly this is unfair on all the other students...
Ok, that last one might be a joke