Hermione / Percy
Hermione looked up, brought out of her readings about the evolution of flippers to see Percy wandering by. It shouldn't have surprised her to see Percy in the library. And it didn't really, she was just a little startled by the voice. She hadn't heard his footsteps coming up.
"Percy! Hi." She broke into a bright grin. "Dinosaurs. Studying the evolution of the flipper. Here, I've got something for you." She turned around and dug into her bag, and pulled out her copy of Hogwarts: A History. "It just showed up on my coffee table."