Sounds to me like your already dating, just neither of you have actually said the word out loud.

And my God man, you just missed the best opening ever. No, you don't have to learn to dance like a pro, all you had to do was wait for a slow song and then tell her you that you are not comfortable dancing but could probably pull off a slow dance.

You even have the added advantage of being sincere instead of it being a 'line'.

With great power comes Awesome irresponsibility.