This guy was an admirer of mistress Marta and she could tell he wanted more and for her that usually meant that he wanted sex from her. She was not ready for that especially with him and she had to find a way to chase him away. So she did it by using her farts. The mistress farted on him as if she had planned it and he got scared and he ran away.
Mistress Marta did not care what this guy felt or thought of her when she teased him with her hot ass and then proceeded to fart on him. She knew he had a thing for round asses and since she had one, she teased him and he was having the time of his life until she farted on him and burst out laughing at the sudden change of expression on his face.
Mistress Marta knew this guy was interested in her but she wanted to gross him out for her own fun as she did not care much about his opinion. So the mistress farted as she looked at him and she told him she found farts to be very good. The guy thought she had gone crazy and whatever he had been entertaining in her mind evaporated and he left her alone.