Every week or so, Rarity gathers all of her friends for a little get-together at her boutique. Or at a cafe. Or in Sugarcube Corner. Anywhere that serves tea or tea can be brought in.

And every time, as soon as their conversation steers towards that most intimate of topics, Rainbow Dash falls silent.

After failing to stop Nightmare Moon in the ancient castle of the pony sisters, Twilight Sparkle is left with a scar that will permanently change the rest of her natural born life. As Twilight recovers from her ordeal, she finds that she is left with a difficult choice. Either live her life as a lie or sacrifice her innocence to protect the ones she loves. The path before her is set and she must now walk it alone. The sands of time continues ever onward, with everyone already trapped in its muddy depths. The sun will rise and the sun will fall. Waiting for its call, Death awaits for all.

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Art created by:
http://cuteskitty.deviantart.com (top)
http://ventious.deviantart.com (bottom)

I just put the two together

On secret assignment from Princess Celestia herself, Twilight investigates a powerful magical artifact for clues to the mystery of Luna's transformation in the evil Nightmare Moon. Incautious use of the artifact sends Twilight hurtling back in time. Can Twilight discover what caused Luna's transformation? And will she ever make it home again?

Kickass cover art used with permission from Bitz.
http://allthebitz.tumblr.com/

Fluttershy gets more than she asked for when she visits the Library and hears moaning from behind the door. Concerned that Twilight may have developed a problem, Rarity and Rainbow Dash go and investigate.

Inspired by Friendship with Benefits is Magic. Not intended as a direct followup as much as my own take on the idea. What is Celestia to do when Twilight Sparkle shares a little too much? And why doesn't Twilight have any idea what she's talking about? And why is Luna smiling so much!?

Followed up by yet another epistolary conversation between Twilight and Celestia about the magic of not knowing what the hay that other pony is talking about. Features a special guest appearance by naughty!Luna.

Further bulletins as events warrant.

Luna's isolation and difficult reentry into Equestrian life has left her without the confidence to communicate with the ponies around her. Especially the one pony she most wants to talk to. Celestia is angry, Twilight is upset and it's all her fault. Then she has an idea... She'll invite Twilight into her dreams. What could possibly go wrong?

A story lovingly ripped off from the Futurama episode of the same name.

Twilight gathers the girls to her basement to reveal her latest invention. Unfortunately, they get distracted by another of her inventions: the 'What If" machine, a device capable of answering any 'what if' question posed to it. Follow along as the mane six discover the improbable scenarios that could have been their lives.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

In which I, Twilight Sparkle, (the biggest idiot in Equestria), fail miserably, utterly, and conclusively in my valiant endeavor to keep my decidedly-more-than-Friendship feelings hidden from one Rainbow Dash (the sexiest fastest mare in Equestria).

Twilight Sparkle may believe in Pinkie Pie's myriad abilities, but when an opportunity to study them from a perspective she never thought possible arises, how can she resist the chance at the understanding she's always truly wanted? More importantly, can Ponyville survive the trade-off necessary for this opportunity?