She's into it

Your breath catches briefly as she runs her fingers over the ring and everything seems to come to a stop. Well, not entirely. Her ass is still buried in your crotch with your growing erection seeming to mold against it, hugged nicely by her taut cheeks. Any apprehension you may feel dissolves moments later when she grinds much more firmly than before, making your cock jump a bit as she giggles and arches her back to push her head beneath your chin. She gives your finger a light squeeze before releasing it and begins grinding quite lewdly even for this place. It draws a look or two but most onlookers probably assume the two of you are drunk as you dryhump each other through your pants and her skirt. The rest of the song is spent that way with the lewd grinding, the younger woman playfully swatting your hand away when you try to place it atop her breast and giggling again. Finally it ends and she slips away from you, leaving you with a small thrill and perhaps a bit of guilt but also a raging hard-on that you don't know what to do with.

She turns to face you and begins backing away, hunching forward so that you can see down her cleavage and giving you a smoldering look while crooking a finger for you to follow.