psuedotwily's core twilestia tenets (typically, a checklist for how deeply I can sink my teeth into fiction)
the pupil's graduation doesn't rid the years of schooling. It's complex because it can't not be.
celestia is one of the only ponies around twilight during her formative years that isn't her immediate family. she's her personal mentor and it's safe to assume she's being entrusted with the care of a filly during that. I don't think their relationship and its many stages and dynamics through the years fade into nothingness.
regardless of how it's done & acknowledged in the art / fic (i.e. is the romance fresh? is it something long seated? is it something undefinable, just for twilight and celestia?), I'm just glad to see it played with. anything that depicts complex dynamics and ships that tie in multiple types of relationships has my heart.
Above Romance, There is Twilight and Celestia
needless to say, twilight and celestia are not a traditional couple. mentioned previously, this just means that instead of trying to fit that mould, i love to see twilestia exploring what their relationship means for them and not for anyone else.
romantic love is the undercurrent, always there and undeniably one of the things tying them together... but there's so much more. I think it all blends together and often can't really be defined by a generic label.
I think twilight loves in a much more mortal way, and celestia loves in a much more unconditional, no matter what it's going to be labeled way. even so, celestia is pulled into being more mortal via twilight's love for her, and twilight is pulled into being an alicorn because of celestia's.
(a separate thing this makes me think is that I can't assign queer labels to celestia. not in a "she's above them" way, but in a way that i just can't picture her being anything for anyone but twilight.)
Slow and Steady Wins The Race (Intimacy)
(rainbow dash reference...)
they take things slow, mainly because would it not be overwhelming to twilight to be with celestia at first? would it not make sense for celestia to be patient — she has all the time in the world, after all, and eventually, twilight does too.
and would it not be weird?
I deeply enjoy celestia not having lovers, not in a long time (or even never, really), and twilight, who's only ever really had eyes for her mentor. twilight's still unlearning her need to please celestia, and celestia's still learning she doesn't have to be alone — and that she isn't.
they're both unprepared, but they learn from each other in many ways.