Master has tied the slave up and uses his face as a footrest and seat. The slave must lick every part of Master's sweaty feet, while the Master is laughing at him and humiliating him verbally. He also has to scrub Master's heels with his teeth. Master uses his face as a foot toy, wiping the sweat and stink into it, and sticking His toes in slave's mouth.
Master also sits on slave's face and makes him sniff His ass.
Two angles - full view and a close-up of the licking action.