"Just like you think your idea is best for everyone," Billy pointed out, unable to just let it go. It was an argument he'd had with adults before. They always thought they knew better. Billy had been in enough bad situations though to know that just because someone was older that didn't make them right.

Except Hermione was agreeing to help him even if she thought he was wrong. And that was unusual.

"But thank you," he said, exhaling the words in a rush. "I- thank you. An expandable chest sounds perfect. Um, what is an expandable chest?"