heheh I've mentioned this before on the writing blog(I don't know where the post is but it's there I think) but I'll mention it again, Vessel writes stories for IV. Vessel'll write fantasy novels for him. elaboration!
I imagine the library in Arcadia is more about the history of Arcadia or fables, tall tales, literature that's more for education than whimsical fun, and I don't see IV as being a big enjoyer of that? he'll read some, but he yearns for a good fantasy novel series
IV will annotate the stories with details he noticed and leave notes about everything he feels and returns it to Vessel. like swaps it out for the next book, and Vessel gets to read through his own writing again and see how much love and adoration IV has poured into the pages during their time with him. it's their love language