Penny nodded at Oliver comment about the books. It was logical - in fact a lot of what the Gryffindor had said today was exceptionally smart. It made her wonder why they had never spent much time together at Hogwarts, he would certainly have challenged the way she thought.
"Oh I know the cataloguing system inside out," she told him with a small half-smile. "When I was younger I wanted to be a librarian, unfortunately my hair never sat in a bun and I don't need glasses."
Moving around the room, Penny gathered the books she needed before sliding them onto the desk where Oliver sat. "Dangerous words Wood. You never know what my mind might get you to do for me." Stretching slightly, she realised that one thing she might need Oliver for was to reach the higher books.