Wait. No, wait, seriously—how did I just fall a little sympathetically in love with Petunia Dursley? This story is simply remarkable. In canon, the Dursleys remain cartoons for essentially the whole of the series, long after the other characters become more nuanced. But here...oh, here Petunia is just so beautifully real.
Perfect prose, spot-on dialogue, and what just may be the best reconciliation of the wizarding and Muggle worlds from the latter's perspective that I've ever seen in fic. Colour me happily gobsmacked.