A bit of a given, but I would like it if reality was changed so that everyone wore diapers and that everyone is at least a little babyish.
More of the MC being the cause of diapers, either intentionally or unintentionally.
Something I missed in Diaper Reality is that you don't read about any children or even babies alongside the mentally regressed adolescents even though they would be affected as well.
I'd like to see an emphasis on how normal diapers are. Like having people nonchalantly wet/mess in front of their friends and comparing diaper designs.
More of sitting on potties with diapers please. Bonus if their proud or get praise for it. More training pants usage, too.
I'd like another Pokemon story, but not like your other one, though. Where both trainers and their Pokemon are diapered.
A wider variety of settings and/or IPs would be appreciated.
I'd pitch an idea for a story or two, but I'm sure you have plenty of ideas already.