In a different continuity from the paired piece, Princess Twilight Sparkle attends the gala wearing her new famous signature fashion: the Princess Dress. And it seems like she hasn't come alone to this function either, having brought her loyal and somewhat cute butler Blueberry Sugar with her.
Officially, she's brought him here as her plus-one (after all, her friends and Spike all get their own invitations to these functions) on the pretense that he needs to get out some more. He's somewhat of an insular pony, not exactly socially awkward or afraid of the outdoors, but more of a homebody with more introverted hobbies. Combined with the fact that his family is housed in the servants quarters of Twilight's Castle (for various reasons including some secret ones known only to Spike) so he literally lives where he works, he tends to spend a lot of his time inside one building unless specifically sent out for something or visiting somepony.
And so, his Princess has brought him here in hopes that he'll expand his horizons and meet some new ponies…and failing that, at least have a helpful servant around to make her night a bit easier. At least, that's what she claims.
Blueberry Sugar is quite a dutiful and loyal butler, not one to question his employer without good cause, especially since she's usually such a good natured and caring pony…still, his mind cannot help but wander, considering if there's some ulterior motive for him being dragged along to this gala. For a supposed exercise in expanding his own personal horizons, he hasn't had much of a chance to wander around without either her presence or Spike shadowing him.
Perhaps this is some subtle attempt at courtship? As she covertly invited him out on a date, intended to show her future fiancée to Princess Celestia and ask for her blessing?
…No, of course not! That would be absolutely cringe of course! OC shipped with canon?! Don't be absurd! XD Besides, it's not proper for a Princess to propose to a servant. …then again, it's not proper to eat hayburgers like a bloody slob in public, so…you never know with silly lil' Twiggles. ;3
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