All it takes, is to have the clear gel massaged onto the skin of the Pony; applying the zipper in order to offer her a way out, if and when you so chose to let her. Once in the enclosure, the new world is permitting new options.
I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP