Kreacher perked up and said, "most certainly miss!" and with a snap of his fingers and a magical pop, he was gone. Shrugging at the interaction, I went back to the book. I continued this for several days before Harry had an incident with the dementor and was rushed to 12 Grimmauld Place. It became much harder to come to the library after that, but Kreacher was able to retrieve books and pointed me to a safe place to read them.