Should I add an introduction to Rain and Lightning?

I think the reason why it’s gone under the radar is because it doesn’t make sense on its own. I’m considering adding a short introduction chapter to explain the gist of Twilight Sparkle is an Espeon Now, but every idea I come up with makes the part of the story where everypony is an Eeveelution sound WAY longer than it actually is.

I’ve finally gotten around to writing chapter 4, by the way.