Celestia doesn't know why she can't stop thinking about her student, Twilight Sparkle. As Princess and Raiser of the Sun,her duty comes first before anything else. That's how Celestia was taught and trained to do. Not this time, this time around Celestia is going to get what she has deserted, and should've been hers all along.

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The main cast; Twilight Sparkle (unicorn), Princess Celestia, Mane 6, Spike, Changelings, Diamond Dogs
The secondary cast; Princess Luna, Trixie, Sunset Shimmer, Shining Armor, Princess Cadence, King Sombra