The first episode of The Gems Trilogy.

Sweetie Belle attempts to deal with the realization that she's developed a crush on Spike. Meanwhile, Spike's own feelings are in flux.

Come, my friends, 'tis not too late to seek a newer world...

Princess Luna feels stifled in the nation crafted by her sister in her absence. After much debate, and over the strenuous objections of Princess Celestia, she decides to leave Equestria and find her own land, to rule as she sees fit. She asks her friends, the bearers of the Elements of Harmony, to join her in her quest as she travels into a wide world full of indescribable wonders, unspeakable horrors, and magics long-forgotten to ponykind.

Recently rewritten. Contains occasional adult humor and violence.
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On a request from Princess Celestia, Twilight Sparkle and the rest of the mane six explore an abandoned mansion located deep in the woods. While doing so, they unwittingly stumble across an enchanted mirror that scrambles their DNA and pops out three brand new bouncing baby ponies. Hilarity and drama ensue as the mane six must cope with being suddenly thrust into motherhood, as well as protect their new foals from a dark god that wishes to use them for his own sinister gain.

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Fanart:
The three foals. by Freefraq on Deviantart.

This story is a sequel to What if: Rarity from The Three Sisters met with Chrysalis

Choosing whether or not to visit Chrysalis has been bugging Rarity for a week since receiving an invitation to do so. But there seems to be trouble brewing in the Hive and Rarity now has little time to act. Either way, her family's future rests in her hooves.

Now with a TV Tropes page! Warning: Will Contain spoilers.

What are the chances your favorite pony was secretly a changeling all along?

Yeah, probably about one in one.

Sometimes, all we need are a few stats to shed some light on a subject.

Twilight discovers Discord in-hiding - which is strange enough - but the discussion they have causes her to consider the particulars of true harmony, and whether or not a being such as he should be allowed to live freely to retain his part in it.

[Written/published between Sept. 2011 and Oct. 2012]

Twilight Sparkle prides herself on following and sticking to her plans, but she isn't as organized as everypony thinks. Her master list, the plan for her life, has an item that she has never been able to check off; and the time has come to fix that. How hard can it be? All she needs to do is go on a date and get a kiss.

Now available in hard or soft cover!

A letter from Celestia interrupts one of Pinkie's parties with disturbing news. Now friendships will be pushed to the limit as Twilight struggles to uncover which of her friends is not who, or even what, she appears to be.

(While not a romance, this does contain a shipped pair)

in Russian

Sometimes, all it takes is a letter to let them know...