Once she was securely bound to the bed, Babydoll asked a question she probably should have put to me a few minutes prior.  

“You’re not a serial killer, are you, Harry?” 

“No,” I replied with a chuckle. “Not a serial killer.” 

“Oh, good, that’s…  Wait, why did you answer it that way?” 

I affected a little twitch, a tiny jerk of my head, that I had never displayed before, as I lightly fingered her exposed pussy.

“Define the word ‘serial’ in this context,” I asked her, innocently.

“Uh,  f-f-f-f-ive?” she eventually stuttered.  

“Oh, then no, honey. Definitely not.” 

I was kidding.

Babydoll knew I was kidding. I think.  

At any rate, it put her on edge for the upcoming light BDSM sex session.

And a Babydoll on edge was compliant, eager to please, and inventive.  

Just what you want in a bound girlfriend, no?