Milly has to watch out for not only the Ninja Maid but also the eventual Ninja Spiders.
Having a Ninja Maid didn't help too much in canon. There are very few allies brave enough to protect someone against the horror that is Milly having fun. Heck, I wouldn't be surprised if Milly somehow conned the spiders into sewing Lelouch a pretty silk dress.
.....Hmm.
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"Lelouch. Hey, Lelouch!"
Lelouch blinked and looked up from his computer to see Milly looking down at him, with one of his Anuhles hanging onto her shoulder.
"What is it Milly? As you can see, I'm rather busy organising the logistics for the new Knightmares."
"Oh, that's fine! I just wanted to ask if I could borrow Borasu-kun here to help me prepare the costumes for the next theme party?"
"Sure. Is that all?" murmured Lelouch, his eyes already glancing back to the screen.
The Demonic Spider waved an arm around briefly. "Hang on, we were gonna ask about his costume!"
Milly casually stroked the agitated spider's leg. "Yes yes, I was just getting to that. Lelouch, you're happy to have a silk outfit for the party right? I'll handle the designs like usual."
Lelouch waved her off. "Sure, silk sounds great. Are we done now? I'm losing focus."
Milly nodded, and as the two of them wandered off, Lelouch could hear their faint discussion, apparently about clothing fashions.
"- Sorry, Borasu-kun, you just don't have a clear enough grasp of human culture. You'll just have to take my word for this. Everyone will love it."
Oh gods, why must my mind not cease coming up with Infernals I need to write!? I've got three ideas I've got to write now. Since all that are left are Scourges and Malefactors, and the patrons of those castes have a lot of them already, I want to do ones that are given their Urge by other Yozis.
I know right? Given that all the Fiend slots are already all taken, I'm officially calling dibs on a (TED-Patroned) Malefactor slot. I feel the story desperately needs an actual Britannian Noble GSP with their own agenda and existing loyalties to Britannia. The story would just be too unlikely without one. I'd do an omake for one now, but I'm already desperately trying to finish my omake for Reinart's trip to see the Lunars before I go on a similar trip of my own. If I wait until later to finish Reinart's omake, it wouldn't give a good set-up for his entry to the story.
....I really need to learn how to write faster.