Immortality isn't living forever; It's endless torture, My own sister along with everycreature else has forsaken me to its confines - Abyss inside her prison.
Fluttershy has a blind date. Rainbow Dash does not approve, so takes it on herself to take the date for herself, showing up posing as her date to prevent her from going out with "some creep". But there was more to the date than she thought.