Thanks for your patience. Then I'll offer an MLP idea I'd like to try and you say if it interests you in any way; feel free to say no (we can discuss other ideas too).
The main focus of this RP would be on the princesses; I'd prefer Celestia as the main spankee, but it can be discussed.
For the general idea would be easier to look at this little comics:
http://pigolica.tumblr.com/post/1416...a-and-twilight
So, the main points are
The princess(es) has mandatory spankings, which she probably kinda enjoys, but on which she has no control anyway;
she can be spanked either by other princess, royal guards or someone different if you have ideas;
spankings are rather harsh and intense due to alicorn's super abilities to endure physical harm and recover quickly, so lots of smacks and some serious implements can go without prolonged consequences;
additional punishments, emberrassment and such are very welcome, but up to discussion.