Some bold soul on AO3 this week has actually dared to write Peter/Harriet wedding night. Though as fanfic goes, it is still barely into smut territory.

I don't think JPW gets Harriet, either (or Peter or Bunter come to that). Her Harriet is always, well, just a little bit dull. Canon Harriet slacks off her writing and does the crossword or reads bad Ruritanian novels, and goes to popular revue performances with men 20 year old men. JPW's Harriet is far too worthy for that.