Yet another one of those "making an account just to leave a comment on Learning to Fly". I came across this fanfic by pure chance a couple of months ago and I'm so glad I did. Not only did you give Hisao some much needed personality but managed to craft such an incredible, believable and layered character out of a picture and a couple lines of text. I've been more invested in this forum than I've been in a lot, hell, the majority of fully featured novels out there.
You've also managed to navigate very complicated themes with care and respect, making sure the emotional notes hit without treating the characters as collateral in the drama. And what emotional notes, gosh, I still get chills thinking about the last recital and how beautifully written it is. I'm patiently waiting on the next chapter (and epilogues!) but if you couldn't manage to get it out for whatever reason, know the trip has already been way worth it.
I started to read out of sheer curiosity, as my grandma had ataxia (obviously not the same kind as Saki, as you can probably guess from her being my grandma) and I also happen to need a cane from time to time for unrelated reasons, which isn't something you see very often in characters around my age. I never expected to get such an emotional and well written rollercoaster.
All this to say, thank you for writing this and I hope things go really well for you in general, whether you're able to keep writing or not!