Madame Marissa wanted her boots licked clean. That was because this loser had messed up and she wanted to teach him a lesson. She expected him to clean her boots when she came home in the evening so that they are ready in the morning when she wore them. He had not done so and her boots were still dirty when she wore them. So he had to lick them clean.
Leave it to Madame Marissa to find a new way to publicly humiliate her worthless rugboy slave. She is inconveniently stopped at the crossing waiting for the train to pass, and decides to have her dirty boots cleaned as she passes the time. She props her long legs out the car window, and orders her slave out to start lapping the filth from her boot soles. The train passes by, with people staring out the window at the loser licking the boots of the very sexy Madame Marissa. She makes him run his tongue up and down the soft leather, lovingly adding moisture from his loser tongue to protect the soft leather of her expensive boots, all the while, laughing her ass off at his humiliation as he is mouth fucked while sucking the heels clean. He begins to bore her, and she is finished with him, time to go!