I like Marvin Redpost, too, and I'm so glad you are using our Book Match service! I'm glad you and Cory can read together and I'm sure it helps his growth as a reader.
Here are three books that I hope you and Cory might enjoy. They are all part of series that can extend your reading pleasure, if you like them!
Knights of the Kitchen Table by Jon Scieszka.
Joe receives a magic book for his birthday present from his uncle. Joe, Fred and Sam are transported to a time when evil knights, fire-breathing dragons and vile-smelling giants roamed the land.