This is one storyline I don’t believe and can’t get interested in …!
It’s a tired, old, “Lolita”-ish, kind of salacious storyline (I know Lily isn’t under age) and it’s been done before in the programme, as others have said. You couldn’t have Lily meeting a lad her own age and getting on with him and doing things that kids their age do without any sort of conflict (difference in social class), could you?
Boring!
Why couldn’t she have found a boyfriend who was black or Asian or dual heritage, or non-binary or something?!
Lily is too arch, too knowing, too snidey for me to think it’s credible that she’s fallen for her teacher.
These “secret/illicit affair” storylines tend to end in tears and this one can’t end soon enough for me.