Tim took in a deep breath and felt the salty air fill his lungs. He looked out over the rocky cliff and into the vast ocean. He felt the sea wind hit his face and heard the loud crashes of waves pounding endlessly on the rocks. It was beautiful. Despite everything that had happened to him, that was still happening to him, Tim could at least say that he enjoyed this moment.

A few months ago, Tim was on track to graduating with his master’s degree in quantum physics. A degree that necessitated a series of experiments, it was during one of those experiments that Tim suffered something like an accident.

Some called what happened to Tim a miracle. As a series of quantumly entangled particles passed through his body he physically de-aged, leaving him with the body of a child, though his mind remained unchanged. It’s a feat Tim was sure several people wished for. As long as he didn’t suffer any unforeseen medical side effects, he essentially added twenty years to his life. Though Tim wasn’t exactly thrilled with the outcome. In addition to the numerous tests done by his university, he had to, understandably, keep the whole thing quiet. People would freak out if they learned someone had been successfully, if accidentally, de-aged. Tim was given a lot of money to keep quiet about it, money he used to fund this vacation which he hoped would help take his mind off of things. Unfortunately, his condition was a constant presence.

“Careful sweetie don’t get too close,” the caring voice of Tim’s aunt Lisa broke Tim out of his blissful trance and he felt a gentle tug from the harness around his chest as Lisa pulled him back from the cliff.

Tim was dressed in an outfit that was much too young for both his actual age, and the apparent age of his body. He was wearing a light blue set of shortalls and underneath that was a white onesie with a dinosaur print, both had snaps along the crotch for easy access to the diaper printed with children’s cartoon characters that was underneath everything. Around his chest was a nylon chest harness with a nylon leash attached to the back. His aunt Lisa was holding the other end of the leash. She was concerned about him “playing too close to the edge.”

Tim sighed in annoyance as he moved closer to his aunt. To say she had been overbearing during this trip would be an understatement. He didn’t really have a choice though. All everyone else saw when they looked at him was a child, a toddler thanks to his aunt’s outfit choice. He couldn’t really get his own room, or drive a car himself, or really do anything without assistance from someone that looked like an adult. He thought it was perfect that his aunt lived in just the place he wanted to visit, but that was before he knew he’d be subjected to this treatment when he got there. Being treated like a baby was definitely putting a damper on his vacation.

“Oh, I think someone’s a little wet,” Lisa said sweetly as she pressed against Tim’s diaper that was definitely wet. Tim blushed as he looked to his left to see a couple who clearly heard his aunt.

“Isn’t he a little old to still be in diapers?” The man asked.

“Oh, hush he’s adorable,” the woman said with a giggle as the two passed by.

“Aunt Lisa!” Tim said still blushing.

“Oh, don’t be so fussy Timmy,” Lisa said reaching into her pocket. “It’s ok that you still need your diapees. Auntie Lisa is here to get you changed.” Lisa revealed what she was searching in her pockets for, a pacifier. She gently stuck it into Tim’s mouth. Tim sighed behind the soother. Spitting it out would only get it put back in. It would just be a waste of time and, now that Tim noticed it, the wet diaper was bothering him. Complying and suckling on the pacifier meant he got it changed sooner.

Lisa reached into the large diaper bag she was carrying and began to unfold a large mat and sat it down on a flatter part of the ground. Tim rolled his eyes, it seemed he would be getting his diaper changed out in the open again. As he laid down on the mat Tim could spy the couple from before pointing at him and laughing to themselves. No doubt they thought it was adorable. Tim swallowed his pride as Lisa unsnapped his shortalls and his onesie to get at the diaper.

“Oh yeah you are soaked baby,” she said sympathetically. “Let’s get you into a nice dry diapee.”

“Lisa, you know I don’t need diapers, right?” Tim said after taking his pacifier out.

“It certainly looks like you need them to me sweetheart,” Lisa said with a smiled as she removed the wet diaper and balled it up.

“That’s just because you kept me on the leash all the time. If you let me go …”

“And fall off a cliff?”

“I was not gonna fall off a cliff,” Tim said with a pout.

“Well, I’d rather you be safe,” Lisa got a new diaper from the diaper bag. “Plus, I remember you having accidents not too long ago.” Tim sighed in annoyance as Lisa slid the new diaper under him and started wiping him clean.

When he was first getting used to his body, Tim did have accidents. He was too used to his adult body and the bladder capacity that came with it. This new one took some getting used to. So there were accidents at first and that was all Lisa needed to keep Tim in diapers full time. Tim was pretty sure he had a handle on it now, and could use the toilet just fine if Lisa let him, but Lisa didn’t really let him. Whether it was situations like this where he physically couldn’t because he was on a leash, or Lisa was just being insistent, Tim hadn’t used the toilet since he had gotten here. No matter how much he protested, and no matter how valid the protests were, Lisa was just too insistent.

Tim had kind of just surrendered to his aunt at this point. It all seemed so inevitable he felt like he didn’t really have a choice. As long as he looked like a child, he would have to listen to an adult. It was unfortunate that what this adult said was that he was a baby.

Lisa had cleaned Tim and taped a new diaper on while Tim was lost in his thoughts.

“There we go,” Lisa cooed. “I bet that feels better huh little baby,” Lisa tickled Tim and it elicited a small smile.

“Yeah, thanks,” Tim finally mustered. Lisa snapped up Tim’s onesie and then his shortalls. She helped him back up and started packing up the changing mat. Tim stood pouting and blushing. The couple from before had made their way back again.

“He is such a cutie,” the woman cooed.

“He sure is,” Lisa agreed. “Be a good boy and thank the nice woman Timmy.”

“Th-thank you,” Tim said blushing more. He put his pacifier back in his mouth to signal he was done talking.

“He seems a little old to be in diapers still?” the man asked more as a question to Lisa than a statement. Tim thought to himself that he had no idea.

“Oh, he’s a bit of a late bloomer but I don’t mind,” Lisa said smiling. “It’s easier to keep an eye on him and he’s definitely not ready for potty training yet.”

“Aww he’s for sure cuter this way,” the woman added.

“Aunt Wisa,” Tim spoke up behind his pacifier, tired of being talked about like he wasn’t standing right there.

“Yeah sweetie?” Lisa asked smiling with concern.

“Tink I wanna go ome.” All three adults cooed at that and Tim silently grumbled.

“I think he’s ready for a nap,” Lisa. “Come on let’s get you in your stroller. Nice to meet you two,” Lisa ushered Tim along and the couple waved their final goodbye.

Tim started to climb into the stroller himself, but huffed as Lisa scooped him up and placed him in it, buckling him up in it securely. Part of him wanted to complain that he could walk back just fine even if it was on a leash. He knew complaining wouldn’t do any good though. Another part of him admitted he was tired, too tired to really want to make the long walk back to Lisa’s car even if he physically could. His smaller body certainly tired faster even if he wasn’t exactly an athletic powerhouse before.

“Let’s get you home Timmy,” Lisa smiled and Tim felt himself being pushed along by the stroller. The way back was certainly bumpy and Tim felt every bump from his seat in the stroller. If it weren’t for that he might have nodded off during the trip. Before long they made it to the gravel parking lot, and seeing Lisa’s grey suv close shot Tim back awake.

Tim was moved from one buckled seat to another as Lisa quickly unbuckled him from the stroller and placed him into a similarly buckled booster seat in her car, securing him in before she moved to the back to store the stroller away.

Tim shuffled a bit to get comfy in the secure car seat. The first few times he was made to ride in it he absolutely hated it. It felt so restrictive and he felt like he could barely move in it, plus it pushed his diaper against him constantly which was especially annoying when it was wet. All of that was still true, but Tim had gotten used to it all fairly quickly. Of course, by the time he got comfortable Tim felt a twinge in his bladder signaling he had to go. This smaller body was proving to be extremely annoying.

Tim pushed up again to get into a better position to wet his diaper. He doubted his aunt would let him out of the car seat for a run to the closest bathroom, so he didn’t feel like dealing with holding it in. With surprising ease, a trickle hit the waiting diaper, and once that trickle hit Tim felt the increasingly familiar sensation of warmth spreading around his crotch as he wet his diaper. When he finished, he shuffled again to get back into a comfortable position. Even when he did, the straps of his car seat almost tauntingly pressed the freshly wet diaper against him.

Tim assured himself that at least he was choosing to wet himself. He still had control of his bladder even if Lisa didn’t believe him when he said so. He wasn’t going without thinking. That was just an assurance though. He had been noticing that he was getting worse at holding it as he got used to going in diaper. He shuddered at the thought of having to go through potty training again, and how humiliating Lisa would make that process.

“All set?" Lisa asked as she sat in the driver’s seat. She glanced in the mirror at Tim in the back and smiled as she pulled the car out of the lot and towards home.

“Lisa,” Time spoke up after a few moments. “Do you have to make everything so … embarrassing for me?”

“What do you mean sweetie?”

“I mean the outfits, the leash, changing me in public like that. It’s humiliating.”

“Aww sweetie …”

“I’m still an adult in here,” Tim continued cutting his aunt off. “It’s so degrading to have to go through all of this.”

“Sweeite I’m not trying to embarrass you,” Lisa said seriously. “You’re just a baby now. Babies wander off, they have accidents, they get fussy when they haven’t had their nap.” That last one was definitely pointed. “I’m just doing my best to take care of you, and with how you look now, I don’t think most people really mind seeing you in a stroller or getting your diaper changed."

“I’m not a baby,” Tim replied quietly. What he meant was that not only was he mentally still an adult, a top in his field quantum physicist at that, but physically even his body was older than a baby. He knew that it sounded like he was just pouting though. Even to Tim who knew exactly what he meat, he sounded like a petulant child.

“I’m going to chalk all this up to you being tired and fussy,” Lisa said a little sternly. “I know you appreciate all the help I’m giving you.”

There was Lisa’s unique brand of insistence again. Tim found it hard to say no to her. It seemed like, no matter how valid his protests, it always came off as being ungrateful. He certainly was grateful, he knew how much work Lisa put into caring for him. He just wished it wasn’t so embarrassing. Even thinking about it, Tim found himself giving up the fight. It was just easier to go along with it, and he was getting shockingly used to the whole thing.

“Do you want a baba of juice?” Lisa asked already fishing one out of the diaper bag.

“Yes please,” Tim reached out and took the baby bottle of apple juice from his aunt and leaned back into his car seat to more easily suckle away at the bottle.

“Good boy. We’ll be sure to put you down for a nap when we get home. You’ve had a big day today. A little rest will have you back to your usual cute happy self.” Tim wouldn’t really describe his usual self as cute or happy, but he didn’t say anything. This was one of those times where the best thing to do was to just keep suckling away at the bottle. Besides, a nap didn’t sound so bad anyway. He got tired so fast now.

AUTHORS NOTE: Got a commission piece for you all. Actual age regression stuff which isn't usually my mo but that's the wonder of commissions. Hope you all enjoy. Fell free to reach out to me on discord or bluesky if you want a commission of your own, it's bigred0603 everywhere.