Being reformed has really agreed with Discord. He gets his freedom, he has new friends, and all he has to do is not unleash his powers on all of Equestria. It's a pretty good deal.
Unfortunately, not everyone's happy with Discord's face-turn. A group of strange creatures are accusing Discord of behavior unbefitting of a Lord of Chaos. But Discord's not worried. He's a spirt with near-infinite power! It's not like they can take him to court.
In this story, Discord gets taken to court for behavior unbefitting of a Lord of Chaos. With Fluttershy there to help him, Discord must try and prove that turning good hasn't made him any less of a chaos-monger. If he fails, it'll be bad news not just for him, but for all of Equestria.
And with Discord representing himself, the odds don't look too good.