Which wasn't a lie. After all, the 'proper way' would have been 'san' or some other honorific that denoted age since he WAS the older of the two. And really, it was up to this Shinichi to figure that out.

Conan chuckled. "It's no fun to just straight up tell you!" He said. He paused. "...but I do know something I just bet you're dying to know."