Earth is being invaded by Equestria, but whatever the motivation is is up to you. I'll try and be lenient here, but first...
-The basic gist of each entry deals with the ongoing conflict in wake of the invasion, whatever that may be, based on the tone or context. It must be a constant theme throughout each story, and if there isn't a chapter that isn't aware of this conflict, it doesn't belong.
-Ponies can be quadruped or anthro, as in with human bodies bearing pony features. (No humanization or EQG)
-Ponies have a mandatory height advantage: whether anthro or quad, the average mare of mane six age is at least 6'4" at eye level.
-There can be any motivation behind the invasion as you please. Ponies can be acting out of "good" or evil.
-Violence and sex are permitted, but please avoid extremely gruesome or traumatizingly detailed descriptions of such acts.
-Stories can be sexual or as non-sexual as you please. If you turn a branch towards your fetish, please leave a warning.
-Please try to be respectful of one another's entries.
-Any time you make a new story, add a "new story" choice.
ALLOWED:
-Size difference / giants.
-Futa.
-Weight gain and fatness.
-Vore.
-Rebellion, successful or otherwise.
-OCs, but try to maintain equestrian context.
-Alt. universes from both sides.
-Pretty much anything not mentioned, knock yourself out.
FORBIDDEN:
-Underage and violence against, implicit or explicit. Main characters must be at least 21.
-Diapers, scat, and watersports.
-Crossovers.
-Refereces of racism, homophobia, or general bigotry.
-Parody or reference of real-life historical tragedies.
-Real-life figures or celebrities.
-Chapters under five lines long.
-One-sentenced choice chapters (unless the poster follows it up with a decent-sized addition)
I reserve the right to edit or delete any chapters as I feel for reasons of grammar or content.
My Little Pony is property of Hasbro, whom I am not affiliated with. I am so sorry, Lauren Faust.