In such a small fandom, it's great to see a good case!fic like this one. Like canon, it is Urban Fantasy
with a cool system of magic and like canon, the fic has all sorts of pop culture references for the Harry Potter
generation like a fan bonus. This fic adds a touch of Celtic Mythology
to the 'verse but still keeps a lot of the Original Flavor
. I also love Nightingale's point of view - it brings a lot to the character aspect of the story, showing how different his worldview/life experience is from Peter's and showing the value of Peter's perspective differently than Peter himself (the narrator in canon) sees it.