Luna: Do you have any idea how terribly that could have gone, Usagi!?
Usagi: Hey, you only said that the Transformation Pen would change my body! You didn't tell me that there was a chance that I'd get brain-swapped with my millennia-old ancestor!
Luna: That's…true, but I expected you to transform into your mom, or an adult version of yourself. The Transformation Pen imprints you with some of the working knowledge and perspective of the "disguise," so that infiltrators have a better chance of doing their work without getting caught up in an obvious mistake. The imprinting works better the more information you have about them, and when you've got the full archive in your own soul…
Usagi: The imprint became more of an "overwrite." Well, at least I'm back to normal, and I feel I understand more about how my magic works! Hopefully I didn't make too much of a splash while in "Princess Mode".
Luna: You left two muggers suspended in midair 3 feet off the ground, and when you came across a beggar you gave him a rock that you transmuted into gold.
Usagi: …Anyway, we're home now, and that's the end of it! *walks into living room* Oh, hey, Naru. I thought you were leaving with the others and…have you been crying?
Naru: I'm sorry, I just…I think I somehow got hit with a Youma mind-whammy. A really, really bad one. And I didn't know if I should just ask for the Stardust to clear my head or try to figure out where I got it so we can find their scheme or-
Usagi: Naru, it's okay. Look, nobody else is going to be home for a while, so take all the time you need.
Naru: So, we were all together to see how the Transformation Pen would work, and then you asked it to turn you into the Silver Princess, and the moment it finished, something…snapped? Awoke? Triggered? I don't know, but it felt like when Luna was describing what the Want-It-Need-It Spell felt like, like there was something I needed to do.
Luna: What was the compulsion?
Naru: It made me…it made me want to hurt you, Usagi.
Usagi: Hurt me?
Naru: Once I saw the Silver Princess, I was filled with such hatred and loathing that I didn't know how to start. I wanted to rip your dress into shreds and force the cloth down your throat until you choked. I wanted to run to the kitchen and grab a knife so I could stab you with it. I wanted to just reach forward and claw your eyes out. So many terrible, terrible thoughts. But the moment you teleported away it just…stopped. It didn't come back when I saw you come home after turning back to normal. But anytime I think the words "Princess of the Moon", I can feel a dull version of that hate still inside me.
Usagi: …Well, first things first. *Transforms into Sailor Moon* Let's see if we can clear this up. Moon Tiara Stardust!
Naru: …No…no, it's still there when I think about the Silver Princess. Usagi, I don't know what's wrong with me! And..and there's words… "a misused shield spell cannot hope to quench the fire of my passion" …What does that even mean?
Luna: …Usagi, can you change back to normal for now? Naru, I want to try a little experiment. Have you heard of word association?
Naru: Isn't that the thing psychologists use where they say a word and the patient says the first thing that pops in their head?
Luna: Yes, we're going to try a version of that. You are going to close your eyes, and when I say a word, I want you say whatever pops in your head and keep going, rambling on and on. It doesn't matter if what you say is silly or doesn't make sense; we're just trying to get you into a full stream of consciousness.
Naru: …I-I don't know. What if I say something embarrassing or…hurtful?
Usagi: Naru, it's going to be okay. I sometimes think mean things too, but I know that I won't actually act on them. If Luna thinks that this is going to figure out what's wrong, I think it's worth giving it a try.
Naru: …Alright. *closes her eyes* So, how do we start?
Luna: Let's start with something simple. Naru, what do you think when you hear the word…puppies?
Naru: Puppies. Puppies are…soft and small and sound so cute when they try to howl. But I think the best thing is their eyes, their pleading little eyes when they look up at you and it melts your heart and you just want to cuddle them forever and ever. I always wanted a puppy but Mom says we can't have one and I wonder what they would sound like if they talked like Luna does I mean would they just be happy or would it be baby talk and-
Luna: Usagi Tsukino.
Naru: Usagi is my friend, my first friend, my best friend. She's always willing to help someone who needs it, of course she's a superhero. She's not good at math, I'm sorry but she's just not been the best at school until recently and I hope she does well and I hope I do well to. I need to learn magic faster because magic's so important to everything we're doing and I don't want to be left behind-
Luna: Princess of the Moon.
Naru: Princess of the Moon is an airheaded, selfish, spoiled little strumpet who's been handed everything on a silver platter her whole life and so she thinks she's entitled to everything she takes a liking to. If she had just been a waste of good breeding that stayed on the Moon like she was supposed to I might have left her alone but noooooo, she's going to take take take and trick him into following her forever and ever. She bewitched him into dying for her sake, and the only thing I regret about her death was that I wasn't the one who did it and it ended faaar too soon! I would see the worlds burn for our love, why couldn't they see he was mine he was mine he was MIIIIIINE!
*Naru stops for a moment, then covers her mouth in horror. As tears start to well up, Usagi swoops in for a hug*
Usagi: Shh, shh, shh, it's okay. Everything's going to be okay.
Luna: …So, that story sounds familiar.
Usagi: Look, it's just some Youma plot, right? Maybe it got planted a bit deeper than normal, but-
Luna: When could it have happened? Naru would have had to have been kidnapped for quite some time to hide a compulsion so well that I couldn't sense the Life Energy used. And such a specific trigger? No Youma would spend the time and energy creating sleeper agents that activate only on seeing the Silver Princess out in broad daylight. No, I suspect that this is merely a…pre-existing condition that is only now rearing its head.
Usagi: …So like me and Serenity? But…is there a way to turn it off?
Luna: Usagi, it's her soul, the soul she was born with, the foundation of who she is. There's no way to "turn it off". And if she ends up following the pattern of her soul…
Usagi: Look me in the eye and tell me that you think Naru's going to betray us.
Luna: …Not willingly or knowingly, but this could make things exponentially worse if she is discovered or something goes wrong. It may be that the best course of action to keep this from escalating is…to remove Naru's knowledge of the Silver Princess.
Usagi: But Luna, that's going to be really hard to do, particularly as we keep moving forward and…oh. You mean erase her memories of…all of this.
Naru: …Erase my memories? So, no magic, no Sailor Moon, nothing?
Luna: Usagi, this isn't just Innocent Bystander Naru who may give us up if she's kidnapped and tortured. This is Waking Soul Naru who has specific hooks in her that, if she gets hit with the wrong type of magic, could turn into a powerful and malevolent entity who knows our true names and where we live. Are you sure that this is the type of risk we want to take?
Naru: …If…if erasing my memories will help keep Usagi and her friends safe, then I-
Usagi: Stop that, both of you. Luna, Naru's magic has already awoken, and she's still going to have Beryl's soul in her. If the Generals are really on the prowl looking for Beryl's reincarnation, being a clueless amnesiac isn't going to help anything. Besides, we owe her for all the work she's been doing. She's helped pay for our magic equipment, she helped evacuate the theater, and she's the only one who can interpret Earth Kingdom writing. As Princess of the…as Princess, I'm saying no. Naru's sticking with us.
Luna: …Very well. In any case, there are obvious risks moving forward, but…there are opportunities as well.
Naru: Opportunities?
Luna: If nothing else, we now know that Naru has a very high ceiling in regards to magical ability. If we can find some way to sift out the arcane knowledge in her soul without bringing the murderous intent along with it, she could advance her studies by leaps and bounds.
Usagi: Wouldn't that also help us figure out how to better handle Youma and the Generals? Like, she won't know what they're doing right now, but she might learn techniques that exploit their weaknesses. Or maybe she'll figure out a way to undo the General's brainwashing (assuming that their regular selves weren't jerks).
Naru: Are you really willing to trust me with this?
Usagi: Naru, you're not a liability, or falling behind. Now that we know what the problem is, we'll figure out a way to work through it. We're princesses with a big headstart, but the Earth Kingdom's going to be part of the new Silver Millennium as well. Why, you're probably more qualified to be Sailor Earth than anybody else.
Naru: …Heh. Sailor Earth, huh?
Luna: Yeah, no, that's not going to happen for a LOOONG while. Anyway, I'll start looking into some meditative techniques. If Beryl's insisting on sticking in your mind, we're going to find a way for her to start paying rent.