Pee is just kind of antisocial. Human poop is detrimental to other humans which is what makes it different than dog or other animal poo. The human excrement is teeming with organisms that live well inside a human body and while may not have adversely affected the person who pooped, can very much affect others. For the same reason, washing your hands after you use the bathroom is of marginal benefit for yourself, but helps with the general hygiene of all you come into contact with (especially if you're handling food).
Anyhow, this whole situation sounds like the great beginning for another diaper story. I'm going to have to think about this one.
I don't know what you mean by proper, but swim diapers for adults have been available for decades. The Gabby pool pant has been out there for a long time (both in the pull on and the "diaper" format). There have been a number of other reusable products as well. Tranquility has had their disposable Swimmates on the market for a couple of years.
Hailey watched Sarah play on the wall. She looked at her phone she got a message from Sarah real mom saying she hadn’t heard from Sarah for a couple years now. Hailey didn’t know what to say about that so she just looked at Sarah.