Sebastian cocked his head as he looked at Dennis. "I was in Azkaban when they buried your brother, Dennis. It wasn't me. But I'm sorry. I'm sorry about your brother-"
He could understand Dennis' despair, though. Of course he could. If only. If only Colin hadn't been a wizard. Or Dennis. Or himself. If only they'd never heard of magic. But Dennis had, and he'd lost his brother, and Sebastian really didn't think telling him he had to go to another country all on his own would help him. Perhaps he could help, maybe he could put in a word to McGonagall again. Try and persuade her-
"I don't want to send you away," he said, honestly. "I'll go back to Fortescue's. If you want to come and join me, we'll go back to Hogwarts together. If you don't, I'll go and tell Professor McGonagall I couldn't find you-" Sebastian nodded his head, turning and walking out of the shop, going to resume his seat and maybe finish his ice cream outside Fortescue's.