And I'm responding to this, too, because now you've gotten me curious about it. That's quite a bit of detail you have there - you'd think someone would recognise it. Are you sure it was on one of the main fanfic sites in the fandom? If it was posted on a more obscure site, that might explain why it's ringing no bells. Can't say it's ringing any with me either. Which is deeply annoying.
Hope someone figures it out eventually.
LabRat