Luna spluttered. Between Celestia's sudden playfulness and the reality of what she was suggesting, she was left reeling. There were many things Celestia could've done to Luna for the absolute mess this had all become, but it took a certain level of class to kick somepony upstairs as a means of punishment. You don’t see being left in charge of everything with the subtle threat that all had better be squeaky clean by the time your sister got back as a punishment? Well then, how about you go and get an entire country dumped on your shoulders all of a sudden and see how well you cope.