Calm down dears.....
The person was employed in a position of trust. The rule in school is strictly hands off the kids. You are not their friend - although you may be friendly. You do not socialise - although there may be school-appointed media through which communications or meet-ups can happen.
This is all explained up-front as part of the contract, and if you don't intend to abide by it, you need to leave.
This person chose to stay and overturn all the rules.
The law in the UK gives an age of consent of 16. Again, this person chose to break the law. That isn't to say that under-16s aren't having sex. The law is designed to protect children from sexual exploitation.
All kids want to have the freedom that grown ups appear to have. So being treated as a grown up is a big attraction.
As we all know, being grown up isn't all haha heehee. And having your heart broken is hard without knowing you'll get called all sorts of names, it'll be all over school, social media means it will probably follow you through life, and the perpetrator smiles and pouts for the cameras.
The perpetrator should be punished for breaking the law, but at least we know they will be unemployable in any position that involves children. It's unfair to think that the media may reward them in the short term by paying for stories, but life ain't fair. Life's also a long song, and one payout from Take a Break won't see you through into old age.
I have kept my post gender-neutral to wind Baz up. No, not really, just because the points made work for all genders.