She considers the danger first

Tara paused as she considered what rules she wanted to write down, of course she wanted to continue her submissive fantasies, but if this book was the real deal, then writing down anything drastic would be liable to backfire on her and leave her frustrated or worse.

She looked at the rulebook again, if it was fake she could just laugh at herself for being paranoid later. But if it wasn't, she needed to make some plans if she really wanted to take this thing as far as it could go, first she needed to write something simple.

New Rule: Everyone who enters the cafe automatically has their clothes turned to the color red.

Tara looked at her own clothes, not a single shade had changed, she then turned her head when she heard the bell to the cafe door open. A girl wearing a green blouse and pale white leggings entered the cafe, and immediately, the colors of her clothes shifting into vibrant shades of red matching the darkness of her original clothing.

The girl let out an immediate yelp, and looked at her own clothes startled, Tara quickly erased the rule and watched as the girls clothes returned to normal. And the girl herself seemed to freeze for a second, one second she was just inside the cafe startled at her clothes shift, the next Tara lost sight of her until she saw her already sitting, having ordered and sat down with a buzzer.

Tara let out a breath she didn't know she had been holding and immediately felt relief she hadn't written anything drastic.

Old Rule: Nobody but the owner of the rulebook, hereby designated as the person currently writing this rule and assigned the designation 'Tara' for all future instances, shall know about the Rulebook. Anybody not of the designation 'Tara' will not understand the abilities and powers of the rulebook and will feel an intense urge to return it to 'Tara' should it become separated from her. Should the Rulebook not be back with 'Tara' an hour after she's lost it. The Rulebook will magically disappear and reappear by Tara's side. Should 'Tara' be dead or otherwise left in a state where she cannot use the Rulebook effectively, hereby defined as 'Tara' being unable to comfortably write down a new rule within five minutes, then the Rulebook will restore Tara to an effective state and transport her into an area where new rules can be written down by her in peace. If no such area exists, the Rulebook will create an area for her.

Tara let out a whistle after she finished writing down the Rule. Now that any fear of separation from her new toy was gone, she had some things to get up too!