Got the idea from a picture that jcosneverexisted done, in this picture he has a store where there are ponies in the wall kinda like drink dispensers.
I swear Derpibooru can give people too many ideas when you give it a browse.

Still new to being a princess, Twilight starts to feel the stress of her royal duties.
The other princesses decides it's time to take her to a special bar they know of.

In this bar the drink are not what you'd be used to, nor are the dispensers you'd be used to either.
This bar takes in handicapped ponies who'd never make it in Equestria and technically gives them a place to stay and work.

This is the tale of when the princesses invites Twilight out for the night and she has her first drink.