"Okay, color me convinced," she replies, with the hint of a smile, as she takes a step back from him - her stance shifting from relaxed into something distinctly combative. She'll wait for him to make the first move, though. Still, to get the ball rolling, as he just reminded her:

"So, would this demon god-king be the same one you used to, oh, watch in the bath?"

Good luck with that, Spike!