While helping Twilight Sparkle search the Starswirl the Bearded Wing of Canterlot Castle for the time-stopping spell, Pinkie Pie gets sucked into a vortex where she runs into four doppelgangers of herself from other points in time and space. A Pariah lost between the barriers of reality requests the five pastel mares' assistance in stopping the Anti-Marenitor's wave of annihilation. The entire fate of the multiverse hangs in the balance. Pinkie Pie, however, is too busy searching for a birthday gift for Twilight.

And then Discord happens.

I blame this fanfic entirely on Ponky, the talented stalker who gave me the prompt in the first place.

Ponkified covert art also by Ponky.

Bon Bon and Lyra play sweet music.

Do not read this.

When one pony loves another pony, but that pony is smitten with another pony, and yet that pony is enamored with yet another pony, who's head over heels for a different pony, who can't wait to express her feelings to her own favorite pony, who worships the earth that the first pony walks on, then what is the pony to say to the other pony that is different from what the pony wishes to confess to the other pony who is longing after another pony who can't wait to share hooves with another pony who is infatuated with another pony who is too flustered to say anything to the first pony to begin with? Can the pony who loves a pony who loves another pony who loves yet another pony who has a crush on a different pony who can't stop thinking about the first pony still all be friends?

Something is eating at Rainbow Dash. Ever since the Royal Wedding in Canterlot, she's been quiet, aloof, and distracted. After a long day's work of shaping the rainclouds over Ponyville, she can no longer keep the truth bottled in. The only problem is, as a picnic with her close friends looms over the horizon, she's at a loss to find a pony she can comfortably share her thoughts with.

"Oh come on, Applejack! Just one trip around the clouds! One!"

It's an invitation that Applejack has heard countless times. However, no matter how often Rainbow Dash bugs her to experience an air ride, the farm filly flat out refuses.

Then one afternoon, on a day when Applejack is strangely quiet and distant, she suddenly agrees to Rainbow Dash's persistent request. The pegasus happily oblidges, not knowing what has truly motivated Applejack to give in, nor the fact that--more than anything--Applejack could really use a good friend right about now.

What threats to its citizens has Equestria weathered in the past, before the Elements of Harmony were given to mortal ponies?
Who did the Princesses turn to in their hours of need?
Why does Big Macintosh talk the way he does?

Rainbow Dash has been dating Pinkie Pie for nearly a month and, in spite of Pinkie’s objections, is keeping the affair a secret from the rest of their friends. Deciding she's had enough, Pinkie Pie throws a party announcing their relationship.

Twilight Sparkle's imagination as a child was unbelievable, probably due to all those books. Which also make up the amazing Fort Book, Twilightopia's first stronghold against the country of Armor! With the help of Captain Smartypants and Private Cadence, General Twilight defends her fort against her brother's advancing army of one!
A tale of Twi's childhood told from her point of view.

Inspired by the cover picture.

Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
Reviews:
One Man's Pony Ramblings
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The Goodfic Bin

In a dark place named Tartarus, a subterranean hellscape between worlds, humans and ponies are paired together at random to survive a gauntlet of horrible monstrocities while the future of their realms hang in the balance.

Now, are you buying that? Good. Cuz I'm friggin' tired of having to explain it all on top of dragging this annoying-ass unicorn around the effing corridors of purgatory along with me. You'd think the damn, burning yahoos who run this place would give us rest stops to drown ourselves in beer or something. Friggin' A.

Oh, and some ponies and humans spill blood together and stuff. I dunno. Stop playing BattleDuty: Future Football and read this, or whatever. Like I give a crap...