His face is just a doormat for my dirty sneakers

Description: I've chosen this slave to be my personal doormat for today - and i'm not going to use his body, but his face, to clean my dirty sneaker soles on! after walking back and forth a few times and grinding my shoe soles on his face, his face is really dirty already ... maybe i need to do something else to get my shoe soles clean properly? i order him to stick out his tongue and wipe my dirty shoe soles over his tongue! this is pretty effective, but i want him to endure some more pain as well - so i go back and forth between trampling his face and using his tongue as a shoe cleaning rag! this loser is completely helpless in the box anyway - completely at my mercy - so it's up to me how much and how long he's going to suffer! do you think my shoes will be clean in the end?!