I have to admit I have a bit of a problem with the pairing, especially in the light of a much younger Luna and Professor Lupin holding hands in your Cho/Luna fic. I've just finished reading My Dark Vanessa by Kate Elizabeth Russell, which is about a young woman whose life is blighted after an affair with a far older teacher, so maybe my view is a bit skewed at the moment. I'd be really interested to know how you got into this pairing. I've never seen it before, though maybe that's because I haven't read widely anough in the fandom.

Having said that, I agree with Kelly's comment as well. The actual fic is as always atmospheric and vivid; you've also taken care to make it clear that this is something Luna wants, so she isn't being coerced.