The teenage (adult) sisters the Kiryuins acquired their power through tickle torture— every woman they have encountered has been broken into a whimpering and loyal foot worshipping slave. Satsuki, the elder; rational, cool-headed, patient, she treats her tickle subjects like disobedient children. And Ryuko, the younger; rebellious, tempestuous, quick to temper; she treats her tickle subjects like worthless dirt. Deep beneath their veneers however is hidden a vulnerability— their beautiful and ticklish feet. One day, Ryuko gets herself trapped in one of their myriad devices, feet bare and exposed, just as her sister comes through. Whatever could happen? Generate a story to maximum length. Describe appearances in detail. Describe feet in salacious detail. Generate mostly dialogue, and make sure the dialogue reflects their personalities.
Remember they are not nice people.