>>20987
I like the way you think, although there's no way any 3DPD video would be worth even a fraction of $100.
How about if, rather than taking her panties off, she knows she's already messed them a bit so she decides to just keep them on and puts her diaper on over the top.
First a little bit of mess leaks out while she's squatting down to get her diapers from under her bed, then you see her laying down on her diaper, still wearing her panties with a small brown lump in the seat, and maybe she pushes a bit more out before she gets it all taped up. Then she squats down and finishes going potty with a look of relief on her face.
Or imagine a girl who is desperate to both pee and poop. She makes it all the way to the bathroom but loses control at the last moment and starts peeing herself just as she closes the door. She makes a big puddle on the floor and gets her legs all wet, but doesn't immediately mess herself. She doesn't go to use the toilet though. Instead she laughs to herself, "I guess I didn't make it again. I'm such a klutz," before squatting down and finishing her accident on purpose right in front of the toilet.
And it's not really messing related, but how about a girl who is a habitual bedwetter deciding to use her bed during the day as an emergency potty because the toilet is occupied? She stands in front of the bathroom door, doing an increasingly urgent potty dance until she gives up, runs into her room, and jumps into bed. She reasons that her sheets are already covered in stains so it's better than peeing on the carpet.