When giantess Lilly realized that her slave was not changing, she chose to unleash her giantess fetish on him. The mistress used her giantess fetish to torture him using her socks. He was crushed and turned into a tiny man then choked with her socks. The mistress could see how he was tortured but she did not care about what he did or how he felt. He had to change.
Madame Marissa is a vengeful giantess and when she is angry she likes to make whoever pissed her do crazy stuff. Today the mistress chose to use her giantess fetish to torture this guy who had misled her to make a wrong move. She did not like that and she had to ensure nothing like that ever happened again. So the mistress crushed and turned the guy into a tiny man.