Following a tiring day, you and Cadence encounter trouble sleeping. The two of you give the matter some thought and you come up with a simple idea that just might do the trick... a late night snack of cookies and milk.
It's the night of the third day following Luna's return. Celestia invites Luna to her room and shares with her little sister how she spent those days during the thousand years she was away, and shows her a room no pony has even seen before.
After witnessing a human that's new to Ponyville attack Pinkie Pie, you waste no time in coming to her aid. In the process of helping her, you discover you're more of a friend to Pinkie than you ever realized.