When this mistress noticed that she had smelly and sweaty feet, she knew she had to find a way to have fun with her situation. That is why and how she got herself doing naughty things like getting her socks smelled and licked by anyone who pissed her off. She wanted to have fun for the duration that she had that problem and while she got it sorted out by a doctor.
Mistress Cassandra was minding her own business when this loser did things that pissed her off. She felt the guy was being a nuisance and she had to teach him a lesson. The mistress used her socks to humiliate him and make him realize that she would not allow that sort of behavior to go on. So she forced him to lick and smell her stinky socks before she let him go.