Slave burned by a cigarette

I am a heavy smoker! And I am a cruel Mistress! Guess how I can join these two qualities to humiliate and get out of control my dirty slave! I light my cigarette and firstly use that submissive guy as a footstool. Of course, he hopes that I will forget about the ash if he behaves quietly and doesn’t show his anger or pain, but it gives me a special pleasure to cover that white back with burning pieces of a smoldering cig and see him convulsing from pain as my sharp heels rip into the skin even deeper!