Bettie has quickly learned in recent weeks how much their assistant actually seems to enjoy the humiliation and punishments ("Cocks don't lie") and so is going to use this to their advantage. A lot of what has happened has been really mean, maybe hasn't always been deserved (or has it) - and as the assistant is under her ass and pussy - there's a lot of sensual teasing. From running fingers against the skin to gently blowing across the ears, face, and later cock - it's impossible not to be aroused. So that's nice... or... because this is not going to end in release, it's not going to end in cumming, is this really mean as nice as it feels. Teasing with words and tongue, the assistant is very quickly a pathetic aroused mess. Desperate for a release which will never happen. Rubbing panties against the cock - a mouth close that's never going to touch. Of course, it's only natural the teasing is going to continue with the feet.