A day in the life of Celestia.
Twilight deals with the aftermath of the changeling invasion during her brother's wedding.
Discord is gone, but the doubts he sowed in his wake are still there. And they don't intend to leave Rainbow Dash alone. An exercise in writing the same scene from two points of view.
Princess Celestia is in danger, and it's up to the best thing since zap apple jam to save her.