I'm taking the slave for a walk in an abandoned industrial area on this terribly hot day. My feet are really sweaty and as I'm only wearing flip flops they got pretty dirty as well - so I decide to take a break and sit down on the stairs - where the slave will have to lick them clean! I take off the sandal and make him lick my dirty sweaty foot soles and toes - then put the shoe back on and order him to lick the dirt shoe soles as well. Then it's time for the second foot to get licked clean - and the second shoe as well obviously! But this time I'm not only making him lick the shoe sole - but also the sweat-soaked inside!