Looking for a fic

[classicdrogn]

So, here I go again with the very vague HP crossover material - the second property this time is The Labyrinth, which I believe is considered to have happened as per canon a decade or so before. Either Dudley wishes Harry away to the goblins or Harry does it himself during one of the locked-in-his-cupboard incidents. Either way, Jareth is not amused by his condition, Sarah takes charge of him, and while not shown on camera as I recall it's implied that various unpleasant things happen to Dudders and his parents due to being themselves and coming to the attention of a powerful Fae, and not getting the hint when minor misfortunes befall them for their poor behaviour. I honestly don't remember if it was the same one as where the bank goblins treat the MC like royalty come Hogwarts time or if that was a different fic with Sarah as the MC herself, aged back a bit to attend. I also have vague notions of Sarah appearing as DADA teacher at some point, but am pretty sure that was an omake or part of an entirely unrelated omnibus collection like dogbertcarroll's series with the ever-increasing title length or Rorschach's Blot's Odd Ideas.