As Twilight and her friends prepare for the wedding of Shining Armor and Princess Mi Amore Cadenza, the real Cadance tries to hold her fragile mind together in the caves beneath Canterlot.

Spiritual companion to Atelophobia and Autophobia. Contribute to the TVTropes page! There is an interesting, but spoiler-filled review of this by PaulAsaran you can read here! Here is the audio reading by Lotus Moon.
Recommended by PresentPerfect.