She dirties her feet up

With her feet sitting innocently, yet flanking the man's still-hard member on both sides, she smirks ever so slightly as she hatched a devilish little idea in her head.

If this man had the audacity to bring his prick out to play in a place like this, she could certainly return the favor!

On the floor where countless other filthy shoes had stepped on - spreading their dust and dirt, she took her slightly moist feet and began to slowly trace circles around the man's cock as if there was some **** field around it. Of course the man was now watching every movement, and his heart had another beat skip as he realized what she was trying to do. He couldn't see it - or _feel _it yet - but a fine layer of soot and filthy particles of dust and all other sorts of dirty things on the ground was now forming on this woman's soles, toes, heels, and forefoot. Yet, her perfectly arched feet made it so that most of this grime did not stick to her midfoot.