This is a request story from Chazkopa, and is an alternate ending to Canterlot Wedding. It's based on this, but when Twilight's about to kill Chrysalis, the changeling queen creates a portal and escapes, realizing that with Twilight so powerful in dark magic, she'd be unable to conquer Canterlot.
The Mane 5, Shining and Celestia apologize to Twi, but it's too late. She doesn't forgive them. Twilight angrily turns to them, and broadcasts a recording of what happened at the wedding rehearsal. The wedding guests were furious. Also, when she broadcasted it, not only Canterlot, but all of Equestria saw. And then...
Why don't you read the story now? 
Chapters (10)
This is really good so far if it gets finished I will probably put it in my favorites.
11166883
Thanks! And this is going to be a long ride...
This is good. I'm glad Twilight forgive Spike.
11167040
Thanks!
Twilight: Spike's a much better brother than Shining Armor could ever be. Of course I would forgive him!
You are bringing the bad memory about this site in 7-8 years ago.
11167054
What bad memory?
11167051
You're welcome. I'm glad Spike get another chance.
Not a bad start.
11167062
The memory when everyone rewrite this episode. I don't want tp remember it.
11167075
Oh. This isn't a rewrite. It's gonna be much more. Twibra, maybe murders of two princesses, and meeting some foals.
It's going to be a long ride.
11167070
Thanks.
Since T.W. mentioned that the images she displayed has now been shown to the rest of Equestria, will this mean they'll be an angry flash mob waiting for the others outside the castle?
11167081
You're very welcome.
11167080
*Go out the story immidiately when hearing that* say like this but do another. How nice!
11167083
I think there will. (Why didn't I think of that?!)
At least it's not rape.
11167109
Yeah.
Why her mother and father too? Then again, they are very neglectful.
Reminds me of a highly advanced Genjutsu from Naruto.
Also, who are the four Elder Gods?
11167125
I'm not really sure... As mentioned in the author's note, I asked DKN117 for permission to use their idea of a different ending to the Canterlot wedding. So they own the first chapter. But the ones after that belong to me.
Kind of wonder what she thinks of Luna at the moment?
11167144
She doesn't blame Luna for anything, since Luna never did anything to her.
this is going to be good
11167171
I'm glad you're enjoying it.
Will Luna, Twilight's/Shining's parents, and even the real Cadence be pissed off at Celestia, Shining Armor, and the Mane Five?
11167083
Probably. Considering if the leader of country had the head of the enemy pretending to their family under nose and they put everything ahead of noticing that something was wrong they would have a lot of explaining to do.
11167415
Agreed.
Not to mentioned that she has unintentionally turn Twilight over to the Dark Side.
11167091
Fair enough.
11167415
Hands down.
11167254
10 to 1 said YES.
I haven't read this yet--but currently reading it now, but I have to ask: How is this in the Spike's Harems group??? Unless there are some future surprises (no spoilers, please
),, it seem that it not in the correct place...
11167580
I think somehow you got the wrong story. This au on the wedding episode.
11167602
I don't think that's the case. I also got the notification that this story was added to the "Spike's Harems" group, despite the fact that the premise does not seem to involve Spike with any harem whatsoever, even if I haven't read it.
11167668
Must have been a glitch somewhere because this au for the wedding episode. Report it to the site and try to find your story.
11167672
I checked the folder it was supposedly in under Spike's Harems, and it's right there. I've already reported it as a misplaced story in the wrong group.
P.S.: If anyone else is reading this, I swear this is NOT an attack. There's just been a mistake with grouping this story.
11167254
They will be very angry indeed.
11167580
I'll tell you there's going to be some surprises later on.
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11167685
Everypony! It's supposed to be in the Spike's harem group! You'll find out later on in the story why.
11167685
For me, this story was placed in the correct group: Canterlot Wedding Blues. Whoever put it in the Spike Harem's group did not even read the story and thought that it was for the Spike Harem's group.
11167729
It's supposed to be in the Spike's harem group. Could you tell me who added it there?
11167730
It is me.
11167740
Ok.
11167729
Chazkopa said he added it, and he was the one who requested this story. So it's in the correct group.
11167746
Ok, sorry. I thought since nothing in the description mentioned anything about a Spike harem, it shouldn't be in the group.
To avoid confusion, you could try subtly mentioning Spike's impending relationships with the Mane 6 or whoever will be in his harem in the description (without spoilers), instead of just relying on the content, so other users won't feel obligated to read the story through to confirm that it's a harem fic.
This is just a suggestion. It's up to you to decide whether to use it.
11167746
Okay.
11167799
Ok.
I can see that when Luna finds out, she'll be furious with the mane 5, her sister, and Shining Armor. I can picture her turning back into Nightmare Moon and joining Twilight and Spike.
(By the way, my Avatar photo is of a drawing I did myself of what Twilight would look like if she was possessed by Nightmare. Her name is Nightmare Nova.)
*After reading all the commotion
So, Spike does get a Harem out of this?
11168472
He does. You'll see.
11168388
She sure will! Luna turning into Nightmare Moon, huh? Not a bad idea...
And your drawing looks great!
11168736
Seriously, who? I know it's definitely not the Mane Five or even Rarity, due to obvious reasons. And Twilight will probably be with Sombra. And definitely NOT Chrysalis, for the same thing.
And since this is still a early season. Ember, Smolder, Gabby, etc. Don't show up yet. Maybe Luna/Nightmare Moon, and Gilda?