This mistress has a big ass and she loves big dicks. She felt that this guy was not able to satisfy her and that he had wasted her time and gotten her hopes up for nothing. She had to humiliate and degrade him which she did with her farts and with her big ass. Besides smelling her farts, he also had to lick her dirty as well as smelly asshole.
Mistress Carolina realized that this guy had a crush on her and she knew she could use that fact to dominate him as she was sure he would allow her do almost anything she wanted to do to him. So she teased him with her hot ass and she had the guy smell her farts. The guy was shocked but he went along with it thinking it would turn her on and she would let him fuck her.