Aziraphale loved books. He loved everything about them. Well, almost everything. The only thing he didn't like about books was selling them. Which was kind of counterproductive, working in a book shop. Then again, he had run a book shop back home, and if Aziraphale could manage there, he could manage here, too.
Not that he sold books back home, though. He refused to. He even threatened Crowley if the demon sold a book while watching his book shop while Aziraphale was away. He didn't ever threaten the demon lightly.
"Hello," he said, as he saw a young woman roaming throughout the book store. "Can I help you find anything?" He could at least do that much. Whether or not he'd sell it to her was a different story. Perhaps that was why he wasn't allowed to be a cashier.