How did Nabiki figured that out?  



On Tue, 14 Oct 1997, David Johnston wrote:

Outside, she covered her mouth to muffle her giggles. 
When she'd recovered, she said to herself, "Serves them 
right.  Trying to treat _me_ like a mark.  Good thing I 
figured it out though.  Akane does make a pretty 
impressive guy.  For that matter, it's a good thing Kasumi 
doesn't notice that sort of thing."