Harry as a Noir style private investigator cleaning up the aftermath of too many hurriedly tidied threads after a war that was all too messy, in a world where the government barely functions, uncovering secrets and scraps of ancient power that Voldemort unearthed in his quest for immortality and which were then scattered across the tattered remnants of his forces who use them in reckless ways.
And Fleur, as either the Femme Fatale to his hardboiled Private Eye, OR, The one warm spot in his day after everyone else has failed understand why he keeps on pursuing the chase long after the war ended despite the toll it wreaks on himself and those around him, the only one that supports him unconditionally because of all the people he knows she was the only one who had no expectations for him from the start.