I'd tell you that you don't need to read the previous story, Harbinger, randomness of George, but given that I can't accurately summarize George in the loosest sense of the word. It is required reading.
It's a one shot, even if the end doesn't shout 'One Shot!' at your face holes.
Edit: I lied! MWAHAHAHAHA!
No Cover Art, because screw tradition.
Brother of discord shows up. Turns out he's actually a good guy. Just don't piss him off.
And to do so he must use the most powerful element of harmony. Exposition! Sequel to: Harbinger, Randomness of George.