I love her thinking, buying her a choker-like collar is exactly what I would do with her. Something that she could wear all the time without being suspicious. That's so much better than the more obvious collars that she could only wear in private. Not so sure about the leash, that's not so much my thing but if she's into it I'm not opposed in using one from time to time.
It's great seeing her taking the initiative, I very much prefer girls who can do that to ones who have to be micromanaged. Girls who are still alive over robots or zombies. If we can put her into a trance with an order and make her like that again temporarily that would be cool, but not for it to be her permanent state of being.
Her blowjob is great, she shouldn't worry about not being able to deepthroat us right away. Having her walk back into the shop with her mouth full is really hot, not really any risk since if there was anyone there she could just swallow it then, but really kinky.
And I love that even if we choose the more hardcore dominant choices, we still don't hesitate to give our cute little Yuki a hug. Just because a couple is into kinky things doesn't mean that they love each other any less. It's really sweet hugging her like that.
Being able to contact her other than just coming here makes perfect sense. It's something else we need to test really, if we give her orders by text do they count the same as in person? That could be important for practical use of the device. Not to mention that giving her orders to obey when she's at home is just plain hot, means like we are with her everywhere.
Her phone being tracked isn't really a problem if she's just a regular person to the villains. If they manage to connect her to us, then we have more to worry about than her location being tracked. It could still be useful to them though. It would also be a risk to remove any such spyware though, since that would probably flag her as a person of interest if the spyware on her phone was suddenly deactivated.
This was a truly fantastic event, I just love it. The only thing I would really change is giving our cute little maid a kiss goodbye when we leave.
Also, after she has a new uniform, maybe should have that new uniform as an option for her image in her phone screen?