Trinity,
My DD is the same as your DS. She is totally into longer novels and has been since before 3. She follows multiple novels at a time, and we discuss plots etc...trouble is, she only reads at a late 1st grade level. She loves the Sisters Grimm novels, Book of Three, LOTR and historical books etc. Those are just what we are reading now! She has tested as borderline EG/PG but ceilinged 4 subtests. I guess not all of these kiddos learn to read at 2-3:)
AL