I'm not a professional on this subject but might of been on TV but this is my view on how it could of been delt with:
1. Send the offender to the principal to see why it happened, call parents to come in to talk about it,
2. Contacted the parents of the offeneded student to have a sit down in front of principal, offeneded, offender & parents,
3. Go over what happened, why, what might/could of happened before, issues between the offender/offended, post event actions between the two,
4. Set up In-School suspension, an involed activity to teach a lesson for either the offender or both depended on what lead up to what happened,
5. Follow up to ensure issue is taken care of, additional activities needed, or a higher level of actio needed.
From my point of view I'd say hormones might of been the driver cause the kid is not smart enough to flirt or even strike up a conversation to see what could happen between the two.
As Red Forman would say: