Madame Marissa did not like how her slave had taken long before coming home after she had sent him. She had to show him that it was not supposed to happen again. She did this by making him lick her boots as well as her feet. She taped her socks on his mouth so that he could smell them and still not breathe using his mouth. It was degrading, humiliating and painful. He learned his lesson.
You know that I rarely give you the time of day except to kneel at my feet and smell my stinky socks. They've been stuffed into my tight shoes all day and totally reek, but I'll do you a favor and let you inhale their vinegar aroma and maybe even lick my smelly feet if you don't piss me off. Worship my sweaty feet and don't make me angry.
Mistress Maeva is doing a little work at her home on her computer when she decides to use her new foot slave as a footstool. Her smelly socks tramples all over his face smothering his nose. She slides her socks off and stuffs her sweaty feet one by one in his mouth. He gags on her big toe as they slide out.