A couple of cute fics I read recently (though they're by no means new, each over a decade old):

https://www.fimfiction.net/story/152173/dear-princess
>a filly having trouble making friends in her new school sends a letter asking the newly-crowned Twilight Sparkle for advice
8k words, Twilight is a cute autist here. Written entirely in the format of an exchange of letters.

https://www.fimfiction.net/story/10624/reading-rainbow
>after a magical mishap leaves Twilight in the hospital without her vision for a few weeks, Rainbow Dash takes it upon herself to keep her friend company by reading to her
5k words, about half of which are taken up by the cute little Shel Silverstein/Dr. Seuss-esque story-within-a-story Rainbow's reading. Really cute story, and despite not even being a romance fic it's sold me on twidash better than any actual twidash content ever has.