Following the actual episodes, we have a disgruntled Celestia replying to Twilight's letters in a different way. Think of it like an alternate universe where sunbutt is a douche. It's great.
Go get three more episodes below.
[1] Source
Letters from an Irritated Princess- Brushing Off Bad Lessons by Historical Equestria
[2] Source
Letters from an Irritated Princess- Boasting is Bad, Buster by Historical Equestria
[3] Source
Letters From An Irritated Princess- Dragons Aren't Shy by Historical Equestria
Playlist
