One possible detail could be that the twins hid inside a big pile of diapers and jumped out to scare their mom. It's a simple yet effective prank.
Well, the diaper twins might have done something really funny to prank their mom. Maybe they put on diapers in a silly way or pretended to be babies again and made a mess around the house just to see their mom's reaction. It could be they hid all of mom's things in their diaper - like - stash.
One possible detail could be that the mom adopted a baby. Maybe she saw an advertisement or was recommended by a friend to an adoption agency. And then she just fell in love with the idea of giving that baby a home.
One possible moral could be about the importance of not taking pranks too far. Just because it seems funny at first, making someone wear a diaper against their will or embarrassing them in such a way can really hurt their feelings. Pranks should be done in good fun and not cross the line into humiliation.
I'm not sure of a specific 'deviantart diaper boy prank story' offhand. But generally, in a prank story, it could be about a boy who is made to wear a diaper as a prank by his friends. Maybe they replaced his normal clothes with a diaper while he was sleeping or distracted. And then his reaction when he realizes what has happened could range from being really embarrassed to getting angry at his friends.
One reason could be that she was too busy playing and ignored the urge to go. For example, if she was building a big tower with her blocks and was so focused on making it taller that she didn't pay attention to her body's signals.
Sometimes, if a girl is ill, for example, has a stomach bug or diarrhea, it will definitely lead to a messy diaper. Also, if she drinks a lot of fluids quickly and her body can't process it fast enough, that can also be a reason. Another factor could be that she is too engrossed in playing and ignores the signals from her body that she needs to go to the toilet, until it's too late and her diaper gets messy.
Another theme might be adjustment. The family would have to adjust to the new situation, both in terms of practical matters like buying double the baby supplies and also in emotional ways, like getting used to the idea of having two new family members at once. And there could be a theme of family bond. The story might show how the twins' relationship with each other and with their family members developed over time, especially considering the unique circumstances of their unexpected arrival.
One possible theme could be sisterly love. Twins often have a unique and deep bond, and Brittany and Tiffany's story might revolve around how they care for and support each other.
A funny detail from my mom's waxing adventure was when she was getting her legs waxed at a salon. There was a small dog in the salon that day. When my mom let out a little scream during the waxing (because it hurt a bit), the dog started barking. It was like the dog was reacting to my mom's pain. My mom couldn't stop laughing after that, and neither could the people in the salon.
The mom might be surprised. For example, if she comes home and sees the baby has a full diaper that needs changing immediately.