"Nah. Maybe we can try something like that later at home but for right now I'm okay being three" Rebecca replied.
"Are you sure? It's really no trouble" he offered again wanting to help her out.
"Thanks but no thanks little bro. Honestly I'm just glad to be young and wearing a diaper" Rebecca said as she lifted up the front of her dress to look at her baby pampers, "I can hardly believe I'm back in them, it feels like a dream come true. I even wet myself and got my diaper changed" she said as she felt the front of her crinkly padding with her fingers, recalling how Jesse wiped and powdered her before putting a new diaper on her. She could even still smell the baby powder on her which she considered to be the aroma of youth.
Sharing those thoughts with her new little brother she watched him grin.
"I know what you mean” Mark agreed, “I felt the same way when I first regressed although I pooped myself the first time.”
"So tell me what's it like to go number two in them?" Rebecca asked curiously to know more about the wonderful gift she could now wear and use.
He grinned at his sister, "It feels amazing, trust me you'll really like it as long as you don't mind the smell. If you want I can make it so you have another "accident" right now" Mark said gesturing to the coin with his thumb.
"Tempting...but I rather just wait and let nature take its course. I wasn’t successfully out of diapers until a few months after I turned four and when I was three I still had issues with control and had numerous pooping accidents, sometimes I could feel it coming but most times I couldn’t” Rebecca explained as Mark followed her every word, eager to learn more about his new sister.
“That being said I also kinda want my first poo poo to be a surprise. Besides mommy already changed both of us just a little while ago" Rebecca reminded him.
“Alright then” Mark replied a little disappointed that he’d have to wait a while longer to see his sister poop her pants. However he understood why she was waiting to experience one of the greater joys of diapers.
Looking at his sister he noticed Rebecca had a thoughtful look on her face.
“You know now that I think about it it’s kinda funny why you made yourself younger, boys typically have more trouble than girls when it comes to potty training so it really should be me getting the odd looks and comments for still being in diapers” Rebecca pointed out before glancing down at her dress which covered her pampers from view, “Not that anyone can see them anyway” she frowned.
“All the more reason for me to make you younger Becky” Mark smirked, trying to convince her.
“Not just yet Marky, like I said before I like being your big sister.”
“Don’t forget you’re not that ‘big’ sis” he chuckled before poking her crinkly attire through her dress to remind her of what she was wearing underneath.
Rebecca giggled, “Well of course I don’t want to be too big for diapers, I still want to feel like and be a baby like you Marky” she said before sticking her thumb in her mouth and sucking on it childishly to prove her point.
“Good to hear” Mark replied before starting to suck his thumb too.
The two toddlers were surprised when Jesse suddenly cleared her throat, pulling their thumbs out of their mouths.
“Are the two of you just going to talk about your diapers all day? Don’t you want to play with your new sister before we have to go home?” she questioned causing the two of them to realize they were wasting valuable playtime by talking.
“Mommy’s right, let’s go” Rebecca yelled before toddling off in the direction of the play area with Mark waddling after her on his new younger legs.
For the next hour the two had the time of their lives as Mark found that the jungle gym was a lot more fun when you had a playmate. He of course showed Rebecca how much fun it was to go down the slide as a baby with them taking turns and even going down a couple of times together. And when that got boring he and Rebecca played a friendly game of tag which she ended up winning since he still wasn’t quite used to moving around yet but was slowly getting better.
After a while…