The next day, Princess Celestia's health had been restored, and they had began debating. Though originally the fight was over the pictures, they decided they were both worthless (especially after a certain purple unicorn 'accidentally' burned them up). Therefore, there had to be some reward for the winner.
Several Hours Later
"I want to be sole ruler for a week!"
"No! We are both entrusted with power!"
The Next Day
"Fine, Lulu. You can be ruler for a week." Princess Luna's cheers could be heard across Equestria.