Mistress Arya realized that this guy was not going to do the things she had asked him to do and she had to find a way to deal with him. She did so using her saliva by forcing him to lick her spit after she had spent time making him watch as she played with her spit. Her aim was to disgust him with her saliva and then humiliate him with it.
Giantess Katelyn had a slave who was a little bit unruly but she managed to get what she wanted from him and she did it by torturing him with her mouth. The giantess shrunk him into a tiny man and in no time, she had him in her mouth and she messed around with him and pretended to crush him with her teeth and then let him out while he was scared and shaking like a leaf.