Cain sat at his desk, looking through one of the books from the library. He flipped through the pages, no matter how many years he had taught, he hated trying to come up with an interesting lesson. He leaned back in his chair, letting his eyes rest for a moment. He sighed, and began to hum a random tune that popped into his head. It was good to be back at Hogwarts, even better to come back as a professor.