"Um, diapers," Dan muttered. By doing diapers first, she would get the more unpleasant thing to test done first, instead of dreading it coming.
"All right, diapers it is," the girl said. She set Dan down. They walked through the aisle, the girl texting her mom constantly to find out what kind of diapers she wanted Dan to test.
Once they figured out every brand the girl's mom wanted to test, the girl brought Dan over to a secluded corner. She used the app to remove Dan's clothes, leaving her in just a diaper. Dan's employee badge stayed on her, but now in her hair like a barette. Then she used the app to put her into one of the brands to be tested.
"All right. Now I have to make you poop on command..." The girl tapped on her phone a bit. It took long enough that Dan was beginning to hope that maybe there wasn't an option for that on the app. Why would there be, after all? "Oh!"
Dan's heart sank. Of course there was an option for that on the app.
"All right. I found a menu that will make you actively test the function of whatever product you have on your person," the girl said, reading what was on her phone screen out loud. "Let's see...there! Test the Big Girl Mess Container." She tapped the phone. A cramp immediately went through Dan's abdomen. She groaned and bent into a squat. The poop came out without any effort on her part. As did the pee that followed.
The girl took notes on each diaper, how well it worked, how nice it looked, and asked Dan how it felt. The app was determined to make Dan put the diapers through their paces; she filled each one up to maximum capacity. A few even leaked, which the girl used the app to clean up.
After thirty minutes of repeatedly shitting and pissing herself, completely at a loss as to where the app was getting all this waste from, Dan finally used the last diaper.
"Awesome!" The girl changed Dan into a fresh diaper. "I'll tell Mom what diaper we should get for my cousin. Now..."
Standing in just a diaper (but at least the diaper Dan had determined was the best), Dan braced herself. She knew the original plan was to test training pants next, but part of her was hoping that the girl was done with her, after spending half an hour on it.