[He tries to cover up a wince. No one had managed to corner him with that much knowledge since the time Hattori had blackmailed the truth out of him.

And he couldn't think of a way out of this. Here, he couldn't rely on anyone to give him an alibi by appearing as Conan. He was on his own.

He takes a long moment before he begins to slowly reply.]

I don't see any point in denying it at this point. But it would be best if you stopped there and forgot that you ever discovered anything. The more anyone knows about this, the more danger they bring on themselves.