Luna, strangely enough, receives a letter from Princess Twilight Sparkle. From the letter she can discern two things. One, Twilight definitely has a drinking problem. Two, she really loves her. And a third can go to being extremely kinky.
Celestia receives yet another letter from her faithful student, Twilight. Except this one doesn't include any lessons about friendship like she was expecting. Only drunk ramblings of a very intoxicated mare. May or not be truthful.