Imagine a reality where kids crossdress in adult clothes and adults crossdress in kids clothes, or a reality where humans have the personalities of dogs. In this story, you follow the regular day-to-day life of a person living in on these realities.
Only ONE Rule: NO FANFICTION. I've got a seperate story for that. I've got nothing else. Go nuts.
So what reality do you wish to visit? Maybe a world where everyone lives as an adult baby? Perhaps one where children carry the role of the adult and the adult carries that of the child? Or maybe neither of these options appeal to you? The choice is yours.