To the internet!

As much as your dick wanted to just run out and start face-fucking the blonde jogger, your brain eventually won out. You wanted to go into this world at least a little informed, so you didn't look like a total idiot to everyone else. Besides, you could always wake up early and meet the jogger tomorrow. Today though, you're going to just do the smart thing and take ten more minutes to check up on some basic facts.

You go over to your laptop and turn it on, then open your preferred web browser and type 'adult baby' into the search bar. Rather than getting the expected ABDL sites that would usually pop up, the top results are instead articles on 'Female Second Infancy'. A lot of them are advice articles on how to deal with either yourself of a loved one going through it (which you figure you may want to check out later), but one of the top ten search results is an informative article on the subject. You double-click that one, and are taken to the website in question.

In a little under your planned ten minute research time, you managed to break the article down into a list of bullet points of the important details.

• Female Second Infancy is the term for the odd condition where otherwise mature adult women partially regress mentally to an infantile state until they hit thirty, where the regression quickly reverses over the course of a year. No one knows what causes it (well, except you of course), thus there is no known way to prevent it entirely.
• 100% of the time, the mental regression begins on a woman's eighteenth birthday with the sudden and severe reemergence of the suckling reflex. It's strong enough that even after second infancy ends, it never truly goes away, making women crave oral stimulation on a regular basis to the point of fetishism. (Which amusingly doesn't explain why it's okay for them to indulge it in public)
• Over the next two years, the mental regression continues to progress, with the most frequently consistent symptom to emerge next being bed-wetting. This eventually progresses to bladder, then complete, incontinence. Other than the oral fixation, this is the only other universal symptom of second infancy.
• Other common symptoms include regaining interests from early childhood, sugar cravings, emotional immaturity, increased saliva production, and emergence of minor speech impediments such as lisping. Somewhat rarer but more severe symptoms include weakened muscles, impaired motor function and skill in limbs, alexia (loss of reading ability), acaluclia (loss of mathematical ability), and partial memory loss (almost always pertaining to knowledge gained in early childhood, such as how to dress themselves). Both the common and uncommon symptoms appear in varying degrees of intensity, and it is very rare for an adult woman to have all of these issues, though it's just as rare if not more so to have none of them. The mental regression stabilizes around age twenty, which in most cases stops both the emergence of new symptoms and the severity of current ones from increasing.
• In the rather uncommon case that a woman is considered to be incapable of caring for herself due to the severity of her symptoms, she will be appointed a Caretaker to watch over her until the end of her second infancy. This Caretaker is usually a close friend, significant other, or family member that is either male or has progressed past second infancy, though self-sufficient younger women with relatively minor symptoms do fill the role on occasion. Caretakers have legal authority over the woman approaching that of a parent (to the point of common slang terms being 'nanny' or 'second mommy/daddy'), though the adult infant still has some rights, including the ability to request a new Caretaker and retaining adult status in terms of sexual activity.
• In some cases, younger women, especially in their teens and early twenties, will have a hard time coping with their loss of self-control and attempt to actively fight against it and try to act as mature as possible. This is more common in women that have recently been appointed a Caretaker, especially ones that valued their independence, causing them to go into denial about their symptoms and their ability to care for themselves. The recommended way for Caretakers to deal with this is by encouraging infantile tendencies and behaviors through either positive reinforcement or punishment.

Most of the information you see is more or less the same as what you had told Charles, though the added detail certainly shed some light on the things you were confused about, like why your sister was dressed so much more 'baby-ish' than the blonde jogger. It seems that the Doc did indeed solve the dilemma of maintaining a functioning society by making it so that some women needed to be cared for more than others. So most women would be self-sufficient enough to keep things running more or less the way they did before, while also ensuring you would still see a good number of women being babied by others. Those last two points about Caretakers in particular were intriguing to you at the moment, for one important reason.

You shared this two bedroom apartment with your female roommate Cheryl, a short and fiery redhead you met in college. You've been friends for a while, and always found her attractive, but you never asked her out, both due to fear over losing a friend and fear she'd move out and leave you stuck with paying the full rent on your apartment. Having turned twenty a few months ago, she's slightly younger than you... and putting her around the point of time in which her second infancy would have fully emerged. You know her to be rather stubborn and strong-willed in the world you are familiar with, usually relying on herself over others. You wonder if the new state of women in this world has changed that any or not, especially since if her second infancy was severe enough she would be **** to be under the care of someone else, most likely you if she still lived here.

It doesn't take long for you realize that it's almost impossible to tell how such a sweeping change in reality would have affected Cheryl. It's possible that she's now a completely different person from the Cheryl you knew, or that she stayed mostly the same save for wearing a diaper and being willing to suck your dick on command, or anywhere in between.

At this point, you figure that overthinking things would just slow you down further. Looking at the clock, you see that it's 8:30 in the morning, around the time Cheryl usually eats breakfast. Reasoning that the best way to find out what happened to Cheryl is to just see for yourself, you leave your bedroom and head to the kitchen.