Looks like Rainbow Dash has been a naughty foal, and needs to be punished. Fluttershy knows just how to discipline their foals when they misbehave…
 

 
Hello Everypony!
 
I decided to get back into following this (sort of?) storyline. The diaper model has also been updated with frills on each leg hole. With the generous guide from ae6b9, I managed to create the frills with ease (Thanks!).
 
I’ve gotten quite a few requests for wet and messy diapers too, and those will definitely come in the future. I’m still finishing the texturing with this one.
 
Others have also commented on how to improve the shape of the diaper as well, which is what I’ll be working on tomorrow.
 
For now, here’s the model download, along with the SFM/Gmod files and blender project file.
 
I also got the ball gag and cuffs from another model pack(not mine), which you can find here.
 
(If you can’t download without an account, you can grab the pack directly here).
 
As always, tell me if you have any troubles with the model. Suggestions are also welcome.
 
Enjoy :)