You are sitting alone in an empty compartment on the Hogwarts Express, and then you see a boy come in. “Oh- I’m sorry. The others are full. I’m Neville by the way. You seem busy, so.. I’ll leave you to it.” and with that, he sits in silence till a while later when the snack trolley comes over and the nice witch pushing it asks if you two need anything and Neville gets 3 pumpkin pasties and eats one before looking at you. “Do you want some too? Here, you can keep it in your pocket.”