Princess Celestia is sometimes an enigma. What is it with her and tea? Why doesn't she drink cider? And how will she react when Twilight Sparkle confesses that she has a crush on her former mentor?
Lovers have their reasons. To Twilight Sparkle, the reasons she loves Celestia are perfectly obvious. And to Princess Celestia the reasons why she can't love Twilight back are equally obvious.
When Twilight visits Celestia's private hall of stained glass windows, the portrait of an ancient astronomer catches her eye. Who was this pony? Why was she so important to Celestia? And why does she look so familiar?
Celestia and Twilight are in a relationship. Twilight wants to meet Celestia's parents. Celestia, understandably, is terrified. After all, it's always awkward when one's parents aren't exactly ponies at all.
My sister is an idiot. Her faithful student, Twilight Sparkle, appears to share her stupidity. Luckily, I am here to lend them a helping hoof. I can't /really/ blame them, though. They're so /adorable/ when they're clueless.
Celestia is struggling to come to terms with her true feelings for Twilight. Unwilling to watch her sister suffer under apathy and indecision, Luna takes it upon herself to help Celestia confront her newfound feelings.
Twilight panics when she discovers that Princesses are expected to have formal dates for Hearts and Hooves Day, so she travels to Celestia for advice, getting a lot more than either of them bargained for in the process.
Twilight and Celestia don't have dates for Hearts and Hooves Day. Luna looks to change that, and Twilight and Celestia find the date to be more than they bargained for.
Tempest knows she did a lot of wrong in pursuit of her goals. She's asked the princesses to pass judgement on her, but their sentence isn't what she was expecting.