Princess Serena was asked by a friend to punish this loser and she did it without asking questions. They were good friends and if she needed her help, she had to give it. She choked the loser using her sneakers and she took her time doing it for maximum effect. She degraded him and he had to endure the pain and the humiliation of it. When she let her go, he ran away faster than she had ever seen someone run.
Madame Marissa did not want to inflict pain on her slave but she had to punish him nonetheless. She chose to use forced foot worship to do it. She humiliated him using her dirty feet and she had crazy fun doing it. She choked him a little as she did it and she had fun seeing how degraded and humiliated he was. She let him go when she saw he could not handle it anymore.