With my ashtray slave on his knees in front of me, I use his mouth as my receptacle for ash and spit before rubbing the sole of my foot across his dirty tongue, making him lick the ass back off of it.
With my foot wet from his tongue, I grind my foot into the full ashtray, covering it with ash and grime that my slave must now lick and suck off of my toes as I my slender foot deeper into his mouth, gagging him.

xoxo, Cybill Troy