There's a difference between things that turn into trees naturally (like the library shelves), things that do so from swells, and those that do so from Fae house-swells. Make sure they all make sense. Swells seem to have different levels, too -- some things turn back into normal forms but some don't. I guess it's partial -- some things turn back all the way and some don't. Totality, meanwhile, makes things stay fully in their swelled form. So my guess is that Fae swells achieve totality, which does explain why MO became a full shared tree. Ashnodes can revert swell totality, so perhaps Valeska should move her Faeins to her Ashnode in her last vignette -- this would offer an explanation for MO's return. Obviously it goes poorly because of Axeitvery.
Another 10-X thing: I don't think "fae blood used up" is right but "fae magic" doesn't feel right either. Looks like two mentions here and possibly more beyond.
11-M is using weird terms again. "Fae magic" and "Fae-calling". Needs to be consistent with the stuff mentioned to Philipp and anything Valeska thinks to mention.