Mistress Gaia has a dangerous mission for this guy. He was to handle and survive tough challenges and conditions so she had to make sure he was ready. The mistress went ahead to tie him and then choke him as well as dominate and torture him a little bit to see whether he had the power in him to endure all of those things. She was happy to find out that he endured without breaking a sweat.
Mistress Gaia did not feel like talking to her slave. She felt like he was an imbecile and that she was wasting her time when she talked to him. So she set out to make him change and she had to make it a worthwhile punishment. Mistress Gaia used her ass to choke him and that made him panic which eventually led him to change in order to avoid being choked again.