For centuries, the grove where the Tree of Harmony had grown stood in peace, rarely disturbed. The spirit of chaos Discord might well be the only one being in all of Equestria who remembers where it came from.
Discord calls out Celestia on the details of his initial reform. He has some interesting demands, which she gives into (but not without a few challenges of her own.) By the time Discord’s final reform comes, they're as close as two friends can be.
In one world, Twilight married Captain Flash Sentry. In another, she married none other than Discord. Both had kids. Both have now been kidnapped. This will not end well.