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 Sparkle visits Princess Celestia in Canterlot, and the two relive some old memories. Childish antics develop into something much more intimate.
Celestia loves Twilight, and she’s not afraid to show it. Or rather, she would show it, but she can’t. Twilight isn’t ready yet. She’s scared to tell anyone about their relationship. Celestia doesn't mind waiting. She’s a patient mare.