Applejack is hearing a voice (only she can hear) that narrates her life and is pressuring her into romantic feelings for Rarity which she resists whole-heartedly
Twilight is confused when she receives an invitation to a party that seems to assume she has a plus one already. Celestia is confused that Twilight is confused. They are dating, right?
Twilight can't stop thinking about Flash Sentry, so she decides to take action. And, like all good plans, it starts with ordering a pizza and rapidly goes downhill from there.