"Sarah, you do realize sneaking off to the Slytherin common room in the middle of the night could get both of us in big trouble." Harry tells his headstrong Gryffindor friend.
"Like that stops the Doctor." Sarah states, studying a suit of armor with her wand. "Oh come on Harry, where's your spirit of adventure?"
"In the Hufflepuff dorm." He dead pans, earning a look from Sarah. "Really Old Thing can't we just go back to our dorms and sleep?"
"Don't call me 'Old Thing', I'm not old Harry!" She punches him in the arm. "This is revenge on the Doctor for last week.."
"You mean when he woke us up at 3 in the morning to show us that thing in the Forest?" Harry asks, and when Sarah smiles with that "causing trouble" look in her eye he has his answer. "What do you have in mind?"
"Oh I'll come up with something by the time we get into the common room…" Sarah replies, walking just ahead of him with a bounce in her step. Oh yes, the Doctor is in for trouble.