Shining Armor awakens one night to find a baby pony/changeling on his doorstep. A baby that is apparently his as well as Chrysalis's. Can he keep Cadance in the dark? Can Twilight help him? Is the queen changeling herself going to make an appearance? How many OCs will there be? Will everypony be in character? Who will cameo? And most importantly, was he technically cheating?

Read and find out.

Sequels contain spoilers. As in you will spoil the twist if you even look at the sequel.

I see you scrolling down. Stop that.

Editors: All of you!
Oh and SmilingKittens

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

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

Instead of Queen Chrysalis' defeat by Cadence and Shining Armor, what if she captured them after they tried to get away and decided that Twilight Sparkle was too smart to be left alone. What will happen to Twilight? And what is Chrysalis planning to do? Will the others even be able to defeat her when Twilight isn't even there to help? Takes place during part 2 of A Cantorlot Wedding and then delves off from there.

Right before the big Canterlot Wedding, Twilight Sparkle makes a 'false' accusation against 'Princess Cadence.' Abandoned by her friends, teacher, and brother, the heartbroken pony experiences conflicting feelings of guilt and anger. Seizing this opportunity, Chrysalis takes in the fragile unicorn as her protege for her plan to plunge Equestria in darkness and chaos. With the Elements useless and the world being torn apart, how can Princess Celestia and the Elements possibly undo the damage they could've so easily prevented? And will Twilight be able to push away the darkness, or lose herself to it?

Note: Alternate Universe because of a few....'secrets' certain characters have, as well as obvious other reasons.

To the shallow eye one would believe that the Capital of the Lunar republic was a domain of ponykind. Here lies, their great city, the throne of their queen and the centre of their industry and military. And yet every dark corner of the streets and behind every great pony, the changelings watch.

There is a reason, "the capital" has no name.

Disclaimer: this is a War for Equestria group story. Link is found below for more information on the universe and fanon.

http://www.fimfiction.net/index.php?view=group&group=703

Cadence is all that's left. Her last companion made the ultimate sacrifice to ensure she could escape. Now, there is no one that was spared by the catastrophe that overwhelmed everything and everyone. Her only option left is to turn to the last pony she could imagine as an ally. Her powers useless, her hopes vanquished, Cadence must be prepared to fight for all she has left to save even a part of what remains...No matter the cost to herself. But, is it already too late?

After an accident, Rarity and Twilight are thrown in a race against time to stop their transformation into changelings before they become part of Chrysalis' swarm forever.

Alone and far from home, Luna has sought out the changelings. Completely in their power Luna is entirely at the whim and mercy of the Queen of changelings, but what has prompted this strange encounter?

Finally pardoned after ages spent languishing in the Canterlot dungeons (though in fine company, to be fair), Futa Chrysalis enjoys a pleasant day out with Twilight Sparkle.

But the little unicorn has something planned, and she won't say what it is...