When Savannah looks for a new slave, she has to find someone that meets her particular needs. She is a bbw and she loves to sit on her slaves. She tries a number of slaves before she finds one. She will put them on her low table and sit on them. She wants to know if they can breathe under her massive weight. There was only one that she liked and could hold her weight.
When Lady Cathys needs a tool to help her get the attention of her slave, she uses her weight. She is a plus sized mistress and she knows how to use it to her advantage. She sits on her slave's stomach, forcing him to breath hard. She wants her scent all in his body so she sat on him happily. While he is panting to breathe, she put her feet in his face, making him smell them and get used to it.