Dare her to take off the dress.

“Stop there, slut!” you order her in a voice loud enough to carry to the stranger. She stops right beneath a streetlight, at the centre of a circle of bright, pale white light, her bare skin seeming to shine.

“Strip off that dress, make it look sexy,” you say. She puts her hands up above her head and starts to wind her body, hips gyrating suggestively, tits swinging gently just a little, nipples hard and pointy in the cool night air. She lowers her arms slowly, her hands caressing their way down from her neck, over her boobs, down her stomach, out to her swinging hips. She hooks her thumbs into her dress and starts to wiggle her hips from side to side, inching the dress down to her thighs. The dark figure across the street stops. You know she’s seen him.

Slowly, as the dress begins to slip down her thighs toward her knees she turns her back to the road and bends at the waist, presenting her bare ass cheeks either side of her scarlet gstring. She drops the dress in a pool of fabric around her high heels, then with one hand on her ass she steps out of it to the side, spreading her legs slightly. Still bent at the waist she steps out with her other foot, bringing her other hand down on her ass in a loud slap.