Discord's School for Padded Princesses

Discord has a new school put together, for the education of Princesses of all types and ages! Of course, Discord being Discord, he's got a few things mixed up compared to the norm - and isn't taking no for an answer.
The diapers, for example, are not what anyone was expecting. The students include at least one male pony and two non-ponies, none of them are here willingly, and Discord's idea of how to teach is not the standard in the slightest.