Sally just nodded nervously and made an "uh huh" sound. Sally wasn't scared of the dark, but she wasn't necessarily a fan of it either, especially not when she knew what kind of creatures were in the forest. So maybe that was why she started shivering, and leaned closer to Harold.
Sally chuckled. "Yes, I know I owe you. And Romilda's in your year, Dingle-berry." Sally shook her head, smiling. Harold's deal didn't sound bad, certainly not something she needed to worry about, unless he got caught. She had a question though, "Who would buy polyjuice potion? I mean, I know you could sell it outside of here, but there aren't any students who would buy it, are there?" Sally took an opportunity to glance at Harold, her eyebrows raised, before promptly looking at the ground again to prevent tripping.