"Don't be fooled by how easygoing Sebastian seems. That guy really knows how to hold a grudge. Believe me, Ke'Oth and N'zall are in for it after this. The way they embarrassed Sebastian today? He will get them back. That's just how he is. There was a demon who crossed him once, and the poor thing's life afterward was miserable beyond belief."
"Choking on water, tripping over flat ground—those were just the mild parts. But I've realized something—it's not just Sebastian. All demons are like this. Seriously petty, every one of them."
"So I've been wondering... is there even a single normal person—uh, I mean, normal demon in the demon race?"
Illiya was forced to listen to the Demon King complain about his own people, though his attention wasn't actually on him. As a result, he missed the Demon King's little slip of the tongue at the end.