The girls have returned home from a big night out clubbing. The bottom of their shoes are heavily caked with sticky black grime from the floor of the club. Who knows what nasty diseases they might have picked up from those filthy public toilet floors. Oh well, not their problem. They order their slave to lick the disgusting filth off their shoes. Later they drop an old stale biscuit onto the dirty basement floor amongst their discarded cigarette butts, crush it under their shoes and make the slave eat it from their soles. Very degrading clip.