Kind of a tangent, but - it just occurred to me that if Susan's at an age where she's getting interested in boys and makeup, Peter must have also been getting interested in girls and drinking and things. I wonder if there's a fic out there that deals with how he navigated that while not dismissing Narnia as imaginary (and I mean, of course it can be dealt with as "Lewis only thought womanliness was bad" but that seems a bit simplistic to me and "he didn't think about it" makes more sense and leaves me feeling more interested in a fic, if that makes sense).

Everything you've said here is so right. I like the Prydain Chronicles as books; I like the Chronicles of Narnia as childhood nostalgia.