Wan looked at her, genuinely confused by the comment, "Why can't you?"
He had never actually learned the particulars on laws about under-aged magic. He knew it wasn't allowed in public muggle areas or done obviously in mixed areas. But he had always assumed it was allowed at home or if supervised.
"You're at your house. Shouldn't you be able to? I thought that's how it worked."
Of course, Wan had been raised as a squib and all he knew on it was mostly what he'd heard from other squibs and boasting from the Chou brothers.