Riku was totally happy to let Sora read while he held him - it was part of the purpose, afterall. To just RELAX with his Beloved and enjoy being around him.
So, of course it couldn't last.
A Trabian messenger arrived at the castle gate, carrying mail. He was a normal messenger, not a royal one, and his clothing was frosted with travel dust. "Letres," he announced himself, "Fer somph der arm." Letters from home, mostly. Not official communications. It was a VERY long trip for him, and he was hungry.