Jeff decides to turn her back pretty far, back to an age before they even met. "Alright... I think I'm going to turn you three years old... Are you alright with that?" She stuttered slightly when she responded, "Uhh, I-I don't mind..."
With her response, he puts in the change, and hits confirm. Once he hits the button, he can instantly see the area around him expanding, the extra space obvious. "W-Woah! That's fast!"
The pubic hair above her pussy went back in, and it shrunk around him; He focused on her lips, seeing how they shrunk with her. She quickly had to sit down to stop her leggings and diaper from falling down, being far too big for her. Her bra fell right down around it, and with her oversized shirt, Jeff could see right up to her shrinking breasts.
It didn't take long at all; By the next minute, her chest became flat, and she shrunk quite a bit. Once the age change was complete, the two were covered by her shirt and diaper, with Emily sitting right next to Jeff's penis. Her clothes adjusted last, the diaper shrinking around them before adjusting to fit her size, with Jeff getting stuffed inside, providing very little breathing room against her smooth slit; Every breath he took was filled with the taste or smell of her slightly pee-stained genitals. "It's so tight in here!"
Her legs were forced to the side, and he couldn't tell if it was his fault or not; They were spread around his body, forcing the vulva to open in front of him, but he couldn't tell if the diaper would do it anyways. While analyzing, though, he realized he didn't feel her leggings tightened against him, and he got curious.
To avoid risk of biting her, he raised his hand to the best of his abilities, placing it in front of his mouth. The movements caused her to shudder a bit. "Wait, Em? What kind of outfit do you have on? I can tell it's different" She seemed to be exploring her new outfit, as it took a moment to respond.
"Uhhm, I appeawh tuh be weawin a cuwte dwess, wif a flowewh design.. dat beawey weashes my knees.." With her age, her voice was pretty high pitched, and can't pronounce certain sounds yet. He guessed that she wasn't good at talking yet. "Aund, looking undewh it, it appeawhs my uhh... diapie... has a pwetty pwincess design." She giggled as she finished, which Jeff found cute. He didn't have many regrets about this choice, except for when.. potty time happens...
"Sounds cute, and seems fitting for you! I'm just hoping you don't need to use the bathroom soon, since I'm uhh... right in front of your area down here" She sounded a bit embarrassed as she continued. "Pwease down't du anyting tu me down dewe.. at weast widout askin..." Jeff couldn't help but note how innocent her voice sounded, despite how she truly was.
"I'll try not to! I mean, it might help if I had more space to do anything. Your legs are kind of uhh, spread apart, and it's just.. kind of putting the parts in my face... Also, by the way, I hit the reality shift feature on this change. From what it says, everyone should see this as normal." "A-Awight, dat souwns good.. awnd hewpful!" She giggled again. He genuinely found her cuter like this than when at a normal age, but couldn't tell if this could be considered 'creepy' or just generally finding her actions cute.