im f***ing astonished by this , would you still consider it "technical" paedophilia if it was a fifteen year old boy getting his arse reamed out ? with or without his consent ?
If it's consensual, it's exactly the same situation - and in fairness teachers know you just CANNOT get involved sexually with students as it's an enormous breach of trust, peodophilia or no peodophilia.
If on the other hand the situation you describe happened without consent, then obviously it's rape.