And that was when Willow's brain finally seemed to catch up with the rest of the conversation. Or, at least, the part of her brain that was reserved to fictional stories that she might, on occassion, reference.
Such as the Harry Potter Series, for instance. Which is exactly where she realized, with the word 'Auror' that Tonks was Tonks. Willow was torn between smacking herself in the forehead and squealing in positive fangirl delight.
Fortunately for all involved, she opted to do neither and instead simply replied, "That's great!" Almost as though just realizing it herself, she gushed, "And that means you have a wand, too, doesn't it? Ooh, that's so neat! I've never actually used a wand before - probably on account of the fact that I never really needed one - but I bet it's so much fun!"