Harry looked at Snape a bit worried something was going to go wrong. Hermione looked at Harry as if she knew what he was thinking. "Don't worry. He's under the Somnambulist Charm. It's primarily used to transport the seriously deranged." The boy who lived nods in understanding, trying not to think to much about Snape and deranged because he could not use giggles right now.
Peter heard Hermione and turned his eyes on her, grabbing her robes. "Sweet girl. Clever girl. Surely you won't let them..."
She pulled her robes from his hands while looking at Sirius.