"You gotta get widdle too, Jeff!" Mike insisted as he tugged excitedly on his son's shirt. As wonderful as it was for Jeff to be taking care of him, Mike knew that the only thing that could top it would be having a playmate in diapers to have fun with. "Pwease? *Pweeeeeeeeeeeeease?*"
"I...I don't know, dad...." Jeff frowned. Though deathly curious as to what the world looked like from Mike's miniscule perspective, diapers were very much his dad's thing. Still, Jeff knew he couldn't resist when Mike stared up at him with those big bright puppy dog eyes, sighing as he gave the toddler a serious look. "Only for today, okay? And if we need anything, I'll be the one to grow back up."
Mike eagerly nodded at this, more than happy to cede the role of emergency adult to his son. Jeff hesitated for another moment before setting his dad down and picking up the Chronivac, fingers trembling as he hit the keys necessary to join Mike in toddlerhood. He yelped when a shock went through him the instant he hit EXECUTE, dropping the device but stunned when he went to pick it up by the sight of his hands retreating behind the cuffs of his long-sleeved shirt. Curious as to what had happened to Mike's grown-up clothes, Jeff got his answer when his shirt suddenly dissolved, the man turned teen squeaking in surprise as he stared agape at his bare bony chest. Both he and Mike were mesmerized as the last Jeff's adult development was undone, the former man whimpering and shuffling from foot to foot as his blue jeans were bleached white and took on crinkly cushy properties. More and more of his shrinking, smoothing legs were exposed to the open air as he plunged backwards through puberty, losing millimeters of height in hiccupping shrink spurts as his jaw rounded, as freckles dotted his button nose and baby-smooth cheeks. Jeff's regression brought him closer and closer to Mike with each passing instant, the toddler unable to hide his delight as his son was rendered every bit as tiny and immature and adorable as he was.
Jeff's former jeans began to take shape as he left his elementary school years behind, the newly-minted preschooler releasing a helpless, high-pitched whine when he began crinkling with the slightest movement. Now unmistakably a diaper, Jeff's Pampers puffed as he grew too even little for preschool, as he tumbled into toddlerhood proper. His brilliant emerald eyes were wide and awestruck at the sight of paw prints appearing on his padding, of his diaper's waistband taking on a jungle motif. So spellbound was he by the sight that he kept staring until long after his transformation had ended - and when he did look up, it was with a peep to see Mike (who was now his size) grinning broadly at his son.
"Jeffy!!" Mike squealed as he took Jeff up in the biggest, tightest hug his pudgy arms could muster. Surprised by the gesture - and by the fact that a toddler was squeezing the life out of him - it was a moment before Jeff could relax and return the hug. "You so cute!"
"Nuh-uh." Jeff petulantly insisted, puffy pinchable cheeks going crimson as Mike giggled at the self-consciousness of the man turned baby. Though he pouted as he studied each new infantile detail of himself, said pout faded as he turned this way and that to take in every inch, his curiosity regarding the transformation overcoming his mortification.
"Well?" Mike eagerly asked after a minute. "How do you feel?"
"...pwetty good, actually." Jeff peeped, he and Mike sharing a giggle at his babyish lisp. He tested out his plump little legs by stepping in place and then tried a tiny jump, the newly-minted toddler waving his pudgy arms as he lost his balance and fell right on his thickly padded butt.
"It's kinda wike I'm dwunk, hehe." Jeff snickered as he climbed back to his bare little feet, beaming when he met his dad's admiring grin. This may have not been his fantasy but Jeff had to admit that he was enjoying the chance to share the moment with Mike, who was clearly having the time of his life. There was something appealing to being this small and young and cute, to know that he'd become too little to even know when he had to go to the bathroom, much less make it there on time. Though he dreaded the moment when he'd be called upon to actually use his diaper, Jeff was at the moment enjoying his dad's happiness too much to worry about that inevitability. "So whatcha wanna do now?"