The stars are right, and Orion's Belt is about to sag. That can only mean one thing.

Discord's mom is coming to visit him and lecture him about his life choices, delivering a millennium worth of grief over breakfast tea.

But not to worry: Fluttershy will there for him, for moral support, specifically by pretending to be the girlfriend his mother has wanted him to get since time immemorial. Of course, such a ruse requires giving her phenomenal fey powers, as well as a little bit of preparation in Ponyville.

This can only end well.