At first I was a bit constipated for a few days, but after that I decided to hold on deliberately. It wasn't easy, but thought of what I would eventually be able to do in my panties kept up my resolve. I wanted to do the biggest shit ever in them, so they bulged at the seams and overflowed - all so I could masturbate myself and cum in the filthy mess.
When the time finally came when I couldn't hold on any longer, I put on a pair of snug fitting panties and prepared to be a dirty girl. The anticipation of what was about to happen was driving me crazy, not to mention the effect it was having between my legs. My pussy was wet and my clit was hard - all from the thought that I was about to fill my panties with the biggest poop ever!
And then it happened! The poop poured out of my asshole with barely a push, filling my waiting panties, covering my ass and spilling out of the leg holes. They were super full and heavy, hanging down between my thighs from the weight of the enormous load. I was in heaven, and I'm sure you will be too when you join me for the panty poop of the century!
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