Ooooh I think it's progress!!! I like that you were able to make a joke like that and she enjoyed it. Try to keep up that playfulness. I remember reading somewhere that the number one quality women appreciate in a man is humor. Kind of suprising... I would think it would be something like empathy or ... hummm... I won't go there... Anyhow, keep those friendly touches going, and some honest flattery every so often. Don't be afraid to hint at desire or interest every so often.
There is no arriving, ever. It is all a continual becoming.