You can't.
Flandre slept in Pirate's Cove.
She slept there because that was, for all intents and purposes, her home. Sendai had made it very clear that she was to stay inside the curtains, and wait, until she could hear the kids outside and Yukari had stopped singing - and only then could she come out and play. The childlike little youkai had made an immediate connection to the game of hide-and-seek, which Sendai had felt was good enough - yes, sure, Hide-and-Seek, whatever. Just remember to stay in there until it's your turn to come out, okay?
And the children loved it, of course, with the surprise and excitement and specialness of it all, and simply seeing their happy faces, hearing their delighted squeals, made Flandre more than happy to stay in the curtains the rest of the time. In fact, being outside for too long now just felt a bit wrong to the blonde.
And so, she had been fast asleep behind those purple starry curtains when she was stirred by the sound of humming, Koishi's humming (the satori hadn't been out to play in more than two months, she'd realized after the fact, and there wasn't any reason she would have been out to play then).
And the sounds of five, high-pitched voices, pealing in laughter, which meant one thing-
Children!
Wide awake in but a moment, she sat up on the hard wooden floor of the Cove, blessed vampire's ears perking slightly as she strained to hear the very minutae of the lovely, joyful noises outside. She didn't question the time of this apparent party. She didn't even know the time. All she could think about was her own excitement, how much she wanted to burst out of the curtains and run and jump and play. She squirmed and wiggled, waited for Koishi's voice to quieten.
But when Koishi's voice died down, so did the childrens'.
A noise of distress.
Confusion.
Fear.
Flandre poked her head slightly out of the curtains - used her silvery hook to pull the fabric to the side. What was happening? She wondered. Why did they sound so-
And then the screams began.
The beast smiled. Wiped off her hands on a stolen suit, stolen suit, stolen hands. Dirty, dirty. Who knew such small bodies could have so much blood inside of them, so much? Why, the walls were nearly coated. Interesting. Definitely interesting. She would have to make a note of it, she knew, for next time. Oh yes, there would certainly be a next time. How could there not?
And she smiled.
That was one thing about her, about that filthy murderer, that Flandre would remember and take with her to the grave.
She smiled.
Standing amongst five tiny, broken, slashed-up bodies, five innocent, extinguished lives, the horrid purple monster - the nue - tipped back her head and laughed. Laughed as the blood on her face trickled into her mouth. Laughed as the blonde girl trembled in fear, in horror, and though she couldn't identify it yet - hatred. Laughed, and laughed, and laughed.
Turned to the little youkai, little vampire-pirate, lurched a foot towards her, half-transformed into the night watchman, he was her friend she thought he was good and the purple-black-beast just leered and laughed. Sharp knife she'd used to butcher the little ones still dripping still bloody and Flandre screamed too just like the children had just as loud just as high.
She screamed so loud and so long she thought for sure Yukari, Reisen, Rumia would hear would come help, would come do something but nobody came. And the nue smiled, grabbed her gently - the woman just murdered five children in the middle of the pizzeria, why would she be so gentle - and cooed, stroked her face and hair with dirty bloody murdering stolen hands.
"You saw me."
Flandre shuddered, and tried very hard not to throw up on the spot.
"You sneaky little git." A chuckle, almost affectionate. "Oh, well. I'm sure you won't tell on me, now, will you, dearheart?"
The sharp end of the knife brushed against Flandre's neck, and the poor child felt hot tears sting her eyes as she whispered an agreement she could barely hear over her heart's frantic terrified beat in her ears.
Another chuckle. "Good girl. You know, I can see why he liked you~." The monster released her grip on the little blonde, leaving the girl to sink to the ground as the nue slipped effortlessly into the full guise of the rather... recently-deceased night guard. A kind man. Just a bit too kind, in fact.
She turned back to look once more at the utterly satisfying, visceral scene, the sort of thing a true youkai embraced. The blood, the fearful expressions now frozen on the faces of those gullible, gullible brats - the one tearful witness, even, yes, the setting itself. A place of merriment and joy during the day, now defiled by the cover of night.
Absolutely picture-perfect.
She hummed, another grin splitting her face. Oh, so very perfect.
And that was when Flandre saw the other defining feature of that murderess, the next thing to be burned into her nightmares, among the bodies and the shrieks and the hot stinking red on the floors and the walls.
Purely red eyes.
Even the pupil.
The nue smiled again, tipped the night-guard's cap, and walked away.
No I don't have a nearly fully fleshed out Touhou Project/FNAF crossover verse shut up that's nerd stuff. Y'all nerds disappoint me for not populating this section. Now I gotta do it. Thanks.
I'll probably update this sporadically with more vaguely connected oneshots because no I can't sit down and write a full story. I'm so sorry.