Give her a diaper to compliment those pigtails

You try to listen to Christina talk about her day, but all you can think about is how adorable she looks with her new government-mandated pigtails. And thinking about that makes you think of your other fetishes. Well, one in particular anyway. Part of the reason why you are so into petite girls is because they compliment your infantilism fetish quite well. You weren't as crazy about it as some people, but from time to time you've fantasized about how cute Christina would look in a diaper, even though you knew she'd never go for it.

The next obvious thought crosses your mind: should you use the Rulebook to make Christina fulfill your fetish? Sure, she wouldn't realize you were behind it, but she's still your girlfriend. A part of you felt wrong for messing with her like this, even if she was unaware of it.

...Ah, what the hell? It isn't like you couldn't just erase the rules later if they start causing real problems. Still, no need to go crazy with it: one rule at a time should let you ease into it, as well as savor the changes you make and have more fun improvising. Knowing that Christina won't mind thanks to your previous rule, you write your newest rule in the book while she talks.

OLD RULE: On their 18th birthday, petite women are given an injection that renders them permanently bladder incontinent. This will only be reversed if the woman later grows enough to no longer be considered petite, though that almost never happens.

Looking up, you don't immediately notice any changes in the cafe or Christina. However, upon closer inspection, you notice that Christina's purse, which was hanging off the side of her chair earlier, was missing.

Worried that it might have been stolen, you interrupt your girlfriend, "Christina, where's your purse? I could've sworn I saw it a second ago."

Christina glares at you, then asks, "My purse? You know I don't bring that to work... Do you mean my bag?"

"Huh?" you let slip, then quickly recover with a, "Uh, yeah."

Christina looks down at the ground next to her chair, then sighs and bends over, "It's right here. See?"

She comes back up holding a light brown shoulder bag that is much larger than the small black purse she came in with. Why had that changed? Unless...

"...A diaper bag?" you ask out loud.

"Wow, way to be blunt about it," Christina said with a roll of her eyes, "Seriously, I keep other stuff in there besides spare diapers."

"So... no purse?" you say.

"You know I only bring that to places where I have to dress up," Christina snaps, "Why are you giving me crap for this now? I know not every petite woman carries one, but the prices for new diapers in public vending machines are highway robbery, and it's easier to keep track of one bag than two."

"I'm not giving you crap," you say back to her, "I'm just curious?"

"About shit you should already know?" she asks, "What's up with you today? You didn't hit your head or something, did you?"

You did not have enough confidence in your acting skills to pull off the amnesia angle, so you instead just sigh and rub your forehead, "Sorry, you're right. I guess I'm just tired. It's been a long day."

"Yeah, I noticed," Christina said, "You weren't listening to anything I was saying, were you?"

"Uh..."

Your girlfriend sighs, "I can't believe this! Are the new pigtails that distracting or do you just find me boring?"

"Neither!" you shout, "I just... look, I'm sorry okay?"

"Yeah, you better be," she says with an angry scowl, setting her 'new' bag back down on the floor.

You were ticked off that she was treating you this way, not to mention frustrated that the rule you added didn't really have a noticeable change. Despite the fact that you knew Christina had a right to be mad in the back of your mind, you felt like you needed some level of retribution on her. Luckily, you have just the tool to do so lying on the table right in front of you.