Talk to the librarian.

You decide that you might as well ask the librarian for permission to enter the forbidden sextion. The librarian is occupied stamping the back of some new books. The ink leaving it's print every time she hammers the school's seal onto the leather bound books. As she does so you can't help but notice how her bun, and other things, wobbles around.

"Uhm excuse me, Miss." You almost whisper. Knowing that if a librarian here is anything like the ones outside of these walls you have to be quite. The librarian looks up and smiles. "Well Hi there" She exclaims rather loudly. "How can i help you"