There is a case over here in Australia of a 15 year old girl who fell in love with her 50-something teacher, left home to move in with him.
Is the issue they're relative closeness in age, the fact the teacher was a female or something else?
there is an issue of trust involved - Parents send there kids to school expecting them to learn and be looked after. they trust the teachers not to do anything untoward. These sorts of issues break that trust and it's not in any childs interest to have their teachers and parents offside. The teacher will probably never work in their chosen field again.
It's just my personal feeling on the issue, but whats wrong with waiting a few months until he's out of school?