Mistress Aleksandra has sexy feet and she loves using them to humiliate and punish slaves and losers. If a slave pisses her off, she would use her feet to humiliate him. And if she is bored and she wants to have a bit of fun, she would do so at the expense of a loser. That way, mistress Aleksandra would have all the fun she needs without breaking a sweat.
Mistress Morgan is a thorough girl. She did her research and found out this guy had a fetish for sexy feet. And since she has sexy feet, she used them to get herself a job. Of course she passed the other aspects of the interview, but the feet part put her over the top. She found a way to expose her legs and her feet while making it all look normal.
Princess Serena did not like the shoes her boyfriend had bought for her. She had told him the shoes she wanted but he went and got cheaper imitations of what she wanted. She wore them and they were not as comfortable and they made her feet sweaty. She used her boyfriend as her sweat remover since it was him who had bought shoes which made her feet sweat. He went back and bought the correct ones.