This story is a sequel to Where No Pony Has Gone Before
The Enterprise's mission to Equestria may be complete but perhaps it's not the whole story...
(This story and the preceding 'Where No Pony Has Gone Before have been bundled together on Space Battles Forum: https://forums.spacebattles.com/threads/where-no-pony-has-gone-before-star-trek-tos-my-little-pony-friendship-is-magic.620290/)