Heartwarming / Six Brides For Two Sisters

• When Twilight and her friends are en route to Canterlot, she has Spike send Celestia a message that they're on their way. She starts to sign off, "Your faithful student", but crosses it out and signs off with "Love, Twilight Sparkle". When Celestia sees it, despite all her internal protests about the whole situation, she can't help but smile.