(To whoever adds a chapter to this storyline, make sure they're of decent length and somewhat detailed)
Jeff watched as his mom walked across the hall to the office computer and then proceed to start typing. Curious he toddled over to stand beside her, looking up at the screen to see she was altering her own profile, though he couldn't see what stats were being altered.
"Wat ar woo goona do too wooself mommy?" (What are you going to do to yourself mommy?) Jeff asked.
She reached down and gave him a pat on the head.
"It's a surprise" she replied with a smile.
Jeff merely crossed his arms at the response, acting very 2 year oldish. Seeing her regressed son and how cute he looked pouting his mom let out a small laugh, "Don't worry you'll see soon enough Jeffy" she promised.
After a few more clicks at the keyboard she saved her mysterious changes, whatever they were then left the computer and returned to his room to stand in the center.
"Uh is somthing suposs ta bee happenwing?" (Uh is something suppose to be happening?) Jeff asked confused.
"Shh honey, just give it a couple more seconds" his mom replied looking excited.
He did as he was told and patiently waited only to be surprised when his mom started to get rapidly younger right before his eyes. She turned into a teenager in no time flat then became a young child three seconds later. Just like with his regression when she past 5 a bright light engulf her and blinded him. Once he could see again he was shocked and stunned to see a 3 year old girl standing where his mother previously stood. Her hair now short came down to just pass her ears and she was wearing a yellow summer dress with pink butterflies on the helm that came down to just above her knees.
The two toddlers stared at each other for a few seconds before Jeff found his voice and broke the ice.
"Mommy is dat weally woo?" (Mommy is that really you?) he asked still not believing what he was seeing.
"Yep it's me alwight. Can woo beweve I'm a baby now just wike you now Jeffy, except I'm am a year older than woo" his mom said with a bit of a lisp and also a hint of pride at being the oldest baby in the room.
As Jeff was still wrapping his head around the recent turn of events his mom, or rather his new baby sister decided to look over her new younger body with glee. Shifting her feet she felt a new sensation of thickness around her waist that was spreading her legs apart.
"Hey Jeffy teck it out my undies also tanged" she announced before lifting the bottom of her dress up to reveal she was now wearing a diaper underneath instead of panties, "I got diapees now too!" his mom excitedly exclaimed jumping up and down a little in place.
Looking at his mom's new underwear Jeff could see it was the same brand as his own; pampers with sesame street designs with hers sporting Oscar the grouch. Several seconds later she ended up letting her dress fall back down in order to pet Luna and Boots who had entered the room and were rubbing up against the toddler girl's legs. His mom ended up letting out a couple of giggles at how ticklish the kitties fur was.
"Mommy..." Jeff said aloud grabbing his mother's attention and causing her to look at him.
"Yes Jeffy"
"Why ar woo...a babee?" (Why are you...a baby?) he asked her.
His mom's cherub face grew slightly red with embarrassment as she replied,
"Well woo see Jeffy..."
She then admitted she wanted to...