Sam had barely sat down in compartment when there was a knock at the door. She looked up from where she was fussing over her rat, and gave the girl a smile. "Sure...c'mon in."

Except, well, she'd already done that, hadn't she?

Not a Hufflepuff, then. "Nice to meet you. I'm Sam. Not new here." She crossed her legs in front of her, and gave Olly a treat from her pocket to settle him down. "Guessing you're not firstie new...where've you transferred from?"