Mistress Gaia knows and her friend were inducting a new member to their group. She had satisfied all the requirements to join their group but there remained one step between her and membership. The mistresses humiliated him and made him lick and smell their sweaty and smelly feet and wanted to see how she would react. She braved it all and impressed them. She was given her membership on the spot.
This mistress was tired but her slave had messed up. She did not have the strength to trample him and do what she normally does to him. So she lit her cigarette and as she did, she made him lick her boots. That did not require as much effort as her other humiliation and punishment methods usually do. When he was done with the foot and shoe worship, she let him go.