To be quite honest, I was fairly surprised when I went through the Fanfiction archive for Inside Out and could not find something – an AU where Riley runs away for real. So, I took it, mixed in a few other plots I had been ruminating over and *Bam!* Instant story!
I’m actually using a lot of my headcanon from my rant, so reading it might be helpful. However, I should explain most of it in story, so it is not required.