"[[http://www.fimfiction.net/story/49776/A-Canterlot-Wedding%3A--Aftermath A Canterlot Wedding Aftermath ]]" is a ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' FanFic written by [[http://www.fimfiction.net/user/Black+Kyurem [=Black Kyurem =]]].
Taking place a week after A Canterlot Wedding, Twilight is plagued with nightmares that leads her to believe that the Changelings are still a threat. It's later found out that she has PTSD not just from the Changeling invasion itself but the fact that her friends, her brother, and Princess Celestia all abandoned her for the imposter.
!! This fanfic provides examples of:
* AccusationFic: A subtle one but it calls out Twilight's friends, mentor and her brother out on their actions.
* BittersweetEnding: [[spoiler:Twilight stays in Ponyville with her friends, but still has PTSD. Thankfully, she's slowly growing to recover from it.]]
* CallBack: Twilight recites certain friendship reports during her shock.
* ComicBookAdaptation: Inverted the First Nightmare in the Prolouge chapter is Based on this [[http://framwinkle.deviantart.com/art/The-Changeling-Threat-300519784 Fan Comic]]
* DisappointedInYou: Both Twilight Velvet and Night Light scold at Shining Armor's actions at his sister.
* DisproportionateRetribution:[[spoiler:The Canterlot citizens are demanding that Celestia should step down and Twilight should be there leader because she saw the signs of the changeling invasion.]]
* HurtComfortFic: A good example of this.
* LeftHanging: a subplot of [[spoiler:a revolution in Canterlot where the citizens demand to have Twilight take the throne doesn't get resolved]].
* MyGodWhatHaveIDone: Nearly everyone had this go through their heads in this story.
* ThereAreNoTherapists: Averted. She's taken to see one after a rather awful incident with her PTSD.
* ThousandYardStare: When Twilight is heading back to Canterlot she is slipping into shock.
* ThroughTheEyesOfMadness: Twilight was briefly hallucinating that her Friends were Changelings before she was snapped out of it.
* WhatHappenedToTheMouse: It's unknown what happens to the citizens of canterlot when [[spoiler:they were told about the underground tunnels]].
** Cadance calls them out on how horrible they were on leaving her behind.
** Twilight Velvet and Night Light gave one to Shining Armor as well.