Discord's long lost little brother returns, Celestia finds him amusing, Luna thinks he's hilarious... but Discord, let's just say he's less than stoked to see his brother again, at first.
Will shenanigan's happen between the two lords of chaos, only time will tell.
(Who am I kidding, we're talking about the lord of chaos and the younger brother that once upon a time idolized him, of course shenanigan's are gonna happen)
In the end, CHAOS WILL REIN SUPREME!
(Potentially a multi-story 'series' if reader's would like that)