Bibliotropic
To leans towards a book as flowers leans toward the sun.
I’m guessing Jo Walton didn’t coin this one so much as borrow it, but most of the top results in google reference her use of it, or at least the SFF community.
“Bibliotropic,” Hugh said. “Like sunflowers are heliotropic, they naturally turn towards the sun. We naturally turn towards the bookshop.”