Unlace her top and pull her boobs out

You order a drink. Then, when she returns to the bar you follow her, and using your supernatural speed set your nimble fingers to work on her corset, pulling the laces out of the top handful loops. This allows you to pull open the top portion of the corset, and you fold the two halves down. You get a good view of her breasts, and perky areolas. You gently rub them a little, and then burrow your fingers underneath her boobs and lift them up in order to completely free them from the corset, and then let them bounce and sag over the edge of the fold.

You go back to your table and watch. It doesnt take too long for her to notice her breasts are on full display, and, probably rather embarrassed she was walking around like that, she immediately ducks down behind the counter to put them back in place.