Aaron sat on his daddy's shoulders all the way to the park, the teen turned toddler enjoying the ride so much that he felt a tang of disappointment at having reached their destination. That disappointment was chased away when Aaron saw the small but well-maintained grounds, when he laid eyes upon the lush lawn and the brand-new playground equipment and the neat circular sand pit plopped square in the middle of it all. The park was empty save for a young mother watching her two young boys run roughhouse all over the plastic slides and platforms, the woman offering Dave a smile and a nod as he plucked Aaron off his shoulders and deposited his diapered tush in the sand.
The young boy squirmed happily as he accustomed himself to the tickle of the sand against his bare smooth legs, taking big clumsy handfuls of the stuff just to feel the grains stream between his stubby little fingers. Soon he and Dave were hard at work creating a grand sandcastle together, Aaron engaged not only because he loved spending time with his daddy like this but because his reduced dexterity made a challenge of the simplest tasks. He stayed seated to make things simple for himself but eventually found a need to stand in order to add a new turret to the growing castle. The toddler managed, with some difficulty, to get to his feet - only to frown when he got there, feeling something shift uncomfortably inside him. Aaron was guided by instinct as he spread his legs and squat just so, the weight in his tummy needing just the tiniest push in the right direction - which is all it took for the two year old to start pooping his Pampers.
Aaron's soft round cheeks burned apple red as he stood in silent shock of what he was experiencing, willing the weight in the seat of his diaper to stop growing as he found himself physically incapable of stopping on his own. Aaron also found himself unable to exercise the barest bit of control over his bladder, his tiny peepee soaking the front of his diaper as he finished filling its seat. Mortified at what he had done, the toddler for several moments could only stare at the sand in stunned silence - and when he raised his eyes, it was to find his daddy regarding him with a bemusement he made no attempt to hide.
"Something you wanna share with me, sweetie?" Dave prompted in a slightly teasing tone. "Can you ask for help like a big boy? Like we practiced?"
"...could you pwease 'tange my dipee, daddy?" Aaron squeaked out his request, giggling despite himself - despite the utter humiliation of having to ask for a diaper change - when his daddy responded by tickling him under his rounded chin.
"Okay, but only because you asked so nicely." Dave grinned as he took Aaron by the underarms and lifted him out of the sand, the teen turned toddler surprised when - instead of carrying him somewhere private - his daddy instead laid him out on a bit of grass right beside the sand pit. Aaron whimpered and wriggled as he was stripped of his ruined Pampers, his teenage sensibilities coming back to the forefront now that he was in such a vulnerable and embarrassing position. The pair of boys on the playground equipment had stopped their ruckus to point and snicker at the distraught toddler as Dave wiped clean his tush and thighs and wet little weewee. Aaron was able to swallow his shame, partly because he thought his humiliation would be short-lived - so he was distressed to say the least when Dave, cleanup finished, stood his son up in nothing but his shirt and his shoes.
"No need to get you back in diapers until we head home." Dave reassures his whimpering son, giving Aaron's soft round bottom a placating pat. "Go have fun exploring while daddy catches up on his email, okay?"
With that, Dave retired to the nearby bench - leaving Aaron standing alone in the middle of the lawn with his weenie dangling freely between his pale meaty thighs, with his chubby rump jiggling with every uncertain step. Part of Aaron wanted to do what his daddy said, to be a good boy and play without worrying about silly things like modesty. Another part saw the Chronivac in the back of Dave's pocket and his best opportunity yet to grab it.