The sequel to The AppleDash Project, but that was episodic you can jump right in! All you need to know is:

Applejack and Rainbow Dash have been together for more than a year now. Their relationship has blossomed through Discord, a changeling army, and a whole hoof full of crazy situations and dumb mistakes. They've managed to form a partnership and learned to work out their problems together, not an easy lesson for two tough, stubborn ponies.

But now Rainbow Dash is convinced that their lives are getting boring, and if there's one thing Dash doesn't like, it's boring. So Dash has set out to make her relationship with Applejack more interesting. . . and AJ's not so sure she likes that sound of that.

From the original AppleDash Project:
The AppleDash Project is a series of short fics attached to various episodes, detailing a relationship between Rainbow Dash and Applejack behind the scenes. The stories take place sometime during or shortly after the indicated episode.

This is not meant to start shipping wars, argue that AppleDash is canon, or offend other shippers. In fact, if you like the idea I encourage you to try it with other ships!

Teen rating means that there may be talking about sex, but nothing on screen. Expect sitcom-like innuendo.

Rainbow Dash doesn't have anypony to spend her Hearth's Warming with—she hasn't for many years. All of her friends are enjoying it and she's had enough. She finds her way to Sweet Apple Acres and asks Applejack if she can spend the evening with her family.

AppleDash shipping. Again.

Seasons one and two are now complete! Season three is being continued in The AppleDash Project: Wherever Life Takes Us.

The AppleDash project is a series of short fics attached to various episodes, detailing a relationship between Rainbow Dash and Applejack behind the scenes. The stories take place sometime during or shortly after the indicated episode.

This is not meant to start shipping wars, argue that AppleDash is canon, or offend other shippers. In fact, if you like the idea I encourage you to try it with other ships!

Teen rating means that there may be talking about sex, and there is one line of dialogue that takes place during intimate relations, but it's warned for and skippable. Nothing sexual is described.

It's a very special day...
Two of the luckiest mares in Ponyville are getting married.
Just who could I be talking about...

As if you don't know.

A big thank you to Tchernobog and Lycan_01 for being awesome editors, and Jackie for the awesome cover art

Distance can drive us apart. It can also bring us closer together.

After all is said and done, and the ponies have gone their separate ways, the only way they have to keep in touch is through letters.

Original Equestria Daily post is here
Russian translation
Chinese translation
Polish translation
Spanish translation

Now with music and audiobook

Rainbow Dash is having an excellent day - that is until a desperate thirst drags her from the sky and into a mess that may take more than simple magic to cure. Can real love bloom amidst the kerfuffle, or will shenanigans reign supreme in this tale of epic cliches and awkward matches?

Progress: (verb); to proceed closer to one's destination or goal.
It's usually intuitive for us to judge how close we are to something, how much further we have to go. But for others, data and numbers are a comforting reminder that progress is being made. But what if the numbers say something different? What if you're not growing closer to your goal, but straying farther from it?

Prior to Season 3
Story one in my Twidash Challenge: Sad Theme

Rainbow Dash isn't having a very good day. First she was in some dark place, then it turns out she's in the hospital. Oh, and she's apparently blind now.

Eventual Twidash!

SEQUAL IS HERE!!!

Inspiried by the cover art, which belongs to the awesome 8-Xenon-8 on deviantart! Also inspired by the Ask Blind Rainbow Dash tumblr blog by Jykinturah.

Youtube reading, by the awesome L0RdZovChAoS, here: http://www.youtube.com/watch?feature=player_embedded&v=6S23CkL48EM

Rainbow Dash doesn't care for love. Applejack doesn't have time.
So when a simple game goes wrong, then Dash's favourite fictional heroine's latest tale takes a turn for the romantic, why does she suddenly find herself with a rose between her teeth?

A/N: I wanted to try something entirely safe for work again, and here we are. Not completely happy with how it turned out, so sorry about that. A (hilariously belated) birthday gift for the amazing RatOfDrawn, who draws cute ponies and has a bit of an AppleDash fetish.

After keeping their secret so carefully hidden for so long, the cat is is officially out of the bag on Applejack and Rainbow Dash when Spike just happens to wind up at the wrong place at the wrong time. Exposed and ashamed, Applejack and Rainbow Dash try to duck out of the public eye as the news spreads like wildfire.

(Possible spoilers in comments, read at your own risk)