Rachel suddenly felt her bowels rumbling as she unloaded a large, stinky mess into the back of her diaper. It turned a bit brown and started to sag a bit from the weight of the mess that was in it. She sighed in relief and smiled.
She looked at her diaper. It was clearly soiled for anyone to see. And it was on display too since she had to lift her new dress to look at the diaper.
Her sister looked at her and giggled. "Did you just go poo-poo?" she asked, smiling at her. She seemed interested by thus for some reason, whatever it was.
Rachel nodded. "I did. I just messed my diaper." she announced to her sister, not really caring if this was a normal thing for her to do or not or not.
This was when her sister revealed that...