Watson looks startled. "Do you? You have a secret name?"

Oh, you can't say something like that to a man like him. He will be curious forever and also too polite to pry too hard. But he really wants to know! Still, he gives a little sigh of acceptance.

"SecUnit it shall be, then. Forgive me in advance if I call you 'Rin' out of habit, but I will try."