Cassandra is going to start her morning exercises with her stairmaster. she bends down and touches her toes to stretch her legs and this causes her anus to pucker around you and for a brief second you catch a glimpse of inside her butt and pray to god that this is as far into your Aunts butt that you are going to go.
She puts her Running shoes back on and she is still wearing her gray sweatpants and white tank top. she steps onto the stair master and puts it on high mode, meaning she is going to bring her leg up as far as she can and then down again. Cassandra takes her first step and for a moment you think she is just walking but then the light purple thong behind you stretches out even further than normal and you are constricted against her anus more than twice as much as before.
Your in a living hell of being trapped in the back of your Aunts thong as she uses her stairmaster. with every step she takes you have to grab onto the sides of her anus to prevent yourself from falling in to an even worse fate of being swallowed by her anus. over time she starts to sweat a little bit and her butt is getting slippery and you dont know if you can hold on much longer.
Finally after over an hour torture Cassandra steps off the machine and rests for a moment. shes really tired and there is an outline of the sweat marks on the back of her sweatpants going over her buttcrack. she pulls the thong out of her butt just a little bit relieving you of some of the pressure but you are still being forced next to her anus. however that relief doesnt last long as Cassandra says "phew that was a good start for my workout now its time for..."
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