Trigger Warnings: Graphic Depictions of Violence, blood, gore, murder, implied and referenced sex (consensual and non consensual) with BDSM elements, abuse, obsession, pyschopathic behaviors and tendencies, cursing.

Basically... Yandere!Chat Noir AU (He's a serial killer). No Ladybug, and Marinette went to a different school. Enjoy my Halloween story!

~~~

When Marinette first came to school, Alya thought she was just shy. She wore a baggy black hoodie and kept her head down all day, her hood always cloaking her face, making it impossible to tell what color her hair was. Alya had tried to introduce herself once Marinette arrived, but all she had gotten was a timid nod before the black-clad girl hurried away. Alya had chalked it up as first-day jitters, she personally knew being the new girl wasn't fun.

Alya assumed Marinette would open up to everyone later in the day, take off her hood, interact with the class. But she didn't. Marinette sat in the back of the class, quietly doing her work, keeping her head down. When anyone in class would go to talk to her, she would make herself look busy or just nod.

This alone wouldn't have made Alya suspicious, but then things started getting weird. On the first day, Chloe, having noticed the new girl for the first time, decided to try and torment her, as she did with all new students she didn't deem adequate.

"Ms. Bustier?" Chloe asked, waving her hand in the air as she interrupted the teachers lecture.

The red headed teacher sighed, putting down her piece of chalk. "What is it this time, Ms. Bourgeois?"

Chloe turned around, pointing to the back of the room. "Isn't it a rule that we aren't allowed to wear hoods during class?"

The girl at the back of the room froze, her pencil stopping immediately, blue eyes widening. Alya notice her jaw tense under the pressure of the class' eyes.

The teacher blinked before her mouth curled into a frown. She turned to Chloe, apprehension in her voice as she said, "I don't see what this has to do with our lesson, Chloe."

Chloe guffafed, placing her hands on her hips. "Well... it doesn't. But as Class Representative, it is my duty to make sure that everyone follows the rules." She turned back to Marinette, sneering. "Even new students."

Alya could see Marinette shrink under the stare, looking down under Chloe's glare.

Alya knew Chloe would win, this was often a conversation that would hapen if someone broke the dress code. The only person who was the exception was Nino, who wore his hat, no matter what anyone said, until the teachers gave up.

Alya gave a sad smile in Marinette's direction, pitying the shy girl, and prepared herself for her teacher to inevitably give the order for Marinette to remove her hood.

But then, the teacher did the most unexplainable thing.

"Ms. Bourgeois, if you cannot contribute something to my lessons, do not interrupt my teaching."

"But she-"

The teacher silenced her with a glare before turning on her heel and returning to her lesson.

Alya had been baffled after that first day. Ms. Bustier always listened to the dress code. The fact that she didn't reprimand Marinette set off something in Alya's mind.

She decided to ignore it, at first, believing Ms. Bustier or the other teachers would eventually correct Marinette. But they didn't. And then Marinette began showing a tendency to be late to class.

The first time it had happened and Marinette had shown up without a late slip, Ms. Bustier told her that since she was new, she would excuse the fact that she did not have an excused absence. The second time it happened, she said the same thing. And the third, and the fourth, and the fifth. Somewhere along the line, she stopped saying anything. Marinette would show up to class late, Ms. Bustier would clearly see her, and she would not even pause her lecture to tell her not to be late.

Not once did Marinette utter a single excuse for why she was late, not once. In fact she never said anything at all, only nodded, looking down at the floor, hiding in the same baggy black hoodie that she wore every day.

This was when Alya began thinking something was wrong. She approached Marinette several times with the goal of trying to ask her if this was the case. Every time, she was ignored.

She then went to her friends about it during lunch, asking if they had also encountered Marinette's strangeness.

"Yeah, she's a bit weird," Alix said, biting into an apple. "It's a little creepy how she never even talks to anyone. And the teachers don't even ask her to answer questions!" Alix finished the apple, chucking the core into the trash can a few fet away.

"Maybe she's just really shy?" Rose offered. "I bet that in a few weeks she'll be talking to all of us!"

Juleka shook her head. "I don't think so, I've never actually heard he speak. There's shy, but she's on a whole other planet of refusing to interact with society."

"Have your tried talking to her?" Mylene asked Alya. "Maybe she's just waiting for someone to offer to be her friend."

Alya groaned, sinking into her arms, covering her head. "I've already tried that. Every time I do, she just leaves."

Mylene sympathetically patted her head. "Maybe you should ask Ms. Bustier. For all we know, she could be mute!"

Alya jolted up, looking Mylene in the eye. "That's it! Hah! All this time it's not that she's shy, maybe she just can't talk!" Alya pumped her fist in the air.

There was a loud crash and they turned their heads to see Marinette on the floor, her food tray spilling it's contents. Standing abover her, Marc was apologizing profusely, offering out his hand to help her up.

Marinette visibly recoiled, flinching away from his offered hand. She backed up, quickly standing up, shaking her head, eyes wide. She left her tray on the floor, her body trembling.

Marc looked confused. "I'm sorry, did I say something wrong?"

The cafeteria had gone silent, everyone listening to their conversation, eyes obviously watching the pair.

In a whisper so quiet Alya was almost not able to hear it, Marinette spoke. Alya would later have to ask multiple people who were sitting closer exactly what she said, but they all confirmed what she originally believed was said.

"You can't touch me." Marinette left the room in a flurry, racing out the doors. She didn't return to school that day.

After the Cafeteria Incident, so dubbed by the school, Alya had scrapped the "mute" theory. Still, Marinette continued to refuse talking, the incident seeming to have made her draw back even more if it were possible.

Alya had so many questions swirling around her head. Why is Marinette so scared of Marc touching her? Did she mean that other people couldn't touch her also? Why did she leave in such a hurry?

So Alya came up with her second theory, which she presented to her friends during the next lunch period.

"You think Marinette's being abused?" Juleka asked warily.

Alya nodded firmly. "Think about it. She never speaks, she's always wearing that hoodie, and she won't allow anyone to touch her!" She gestured with her arms. "She's probably hiding bruises underneath her hoodie, which is why she wears it all the time."

"Then why would she always wear her hood?" Alix questioned.

"A lot of abuse victims are embarrassed or feel bad about themselves, she's probably using it to hide from everyone."

Rose nodded thoughtfully. "Then what do we do?"

"Maybe we could give her the numbers of a few lawyers? See if she can get moved into a better home." Mylene said. "But first, we should probably tell Ms. Bustier our concerns."

Alya hummed in agreement, formulating a plan.

When they went to Ms. Bustier, however, things did not go as planned.

"Girls..." She said as gently as she could. "Are you sure this is the truth? Have any of you asked Marinette if this is the case?"

"We've tried, Ma'am." Alya said bitterly. "She won't speak to us."

"I've heard her say five words total, Ms. Bustier. And they weren't even to me." Alix responded.

Ms. Bustier nodded slowly. "I understand your concerns, girls, and I'm proud you've come to me to discuss this."

"We would never let one of our classmates suffer." Rose said firmly.

"Yeah," Mylene agreed. "And if there's anything we can do to help one of them out, we do it."

"Accept if it's against the law." Juleka responded.

Everyone was quiet for a moment. Juleka just shrugged.

Ms. Bustier blinked, her hands claclasping her coffee mug. "As I was saying, thank you for coming to me with this information..." Alya felt pride burning in her chest, grateful her teacher appreciated and took in their claims. "But I'm afraid your wrong."

"I'm sorry, what?"

Ms. Bustier shook her head. "Your concerns are appreciated but your conclusion isn't the truth." Their teacher met each of their eyes. "Marinette has talked to me, she has a tough life outside of school, something I trust will not be dug into any further unless consent is given." She gave Alya a look at that. "I won't disclose what isn't mine to tell. If Marinette feels the need to discuss her life with any of you she will. But since that is not the case, we would both appreciate that you leave her to herself. How she acts in school is the product of something only she truly understands. Do not take offense to whether or not she behaves a certain way around you. It's simply her coping method for something she finds difficult."

Alya swallowed, taking in the information. "Is she okay, Ms. Bustier?"

Ms. Bustier looked our the window, her gaze looking beyond the glass, maybe beyond something they could see. "Thank you for sharing this with me, but I think it's time you leave."

"But-"

The teacher silenced her with a look.

"Yes, Ma'am," Alya sighed, looking at her hands.

As the group of girls left the classroom, Alya couldn't help but fee like she was missing something.

As they walked down the hall Alya blurted out, "You don't think Ms. Bustier was lying, do you?"

Rose paused her walking. "Why would you say that?"

"I just..." Alya began. "Its feel like she's hiding something from us, you know?"

"Why would she do that?" Mylene asked. "And even if she was, I really don't think it's our right to demand an answer."

Alya leaned against the lockers, arms crossed over her chest. "I agree with you on that, but I still believe that Marinette is being hurt. It could be by parents, it could be by her boyfriend, or something, but I still think it's happening. I don't know about you, but I wouldn't be able to live with myself if something happened and I had an inkling but didn't do anything about it."

For a moment, everyone was silent, considering.

"So what now?" Alix asked Alya, breaking the silence. "We were literally told not to get involved. So how are we gonna do this; what job are you gonna give me?"

Alya let out a sigh of relief. "Thank you, Alix. This means a lot to me."

"Well... I'm in too!" Rose exlaimed throwing her hand forward. "Are we all in this or what?"

Alya and Alix each placed a hand over hers.

Mylene and Juleka followed.

"So we're in ageement, then." Alya said. "We help Marinette no matter what the teachers say."

All heads nod.

"Good. I'll try and brainstorm a plan and tell you girls later. Text me if any of you come up with good ideas."

Rose saluted. "We are at your service, Alya."

Just then the bell rang, signaling lunch was over. The group of friends walked to class together, Alya finally feeling confident that she might finally have figured out the real truth about the way Marinette acted.

As she stepped into Ms. Mendeleiev's physics classroom. She waved to Nino as she passed, sitting down in the seat behind him. Lonely, it was lonely to sit by yourself, Alya thought. She couldn't help but glance to the back table, finding Marinette in her usual spot.

Marinette sat slouched, arms acting as a pillow for her head as she rested against her desk. It was almost like she was... Sleeping! Alya realized, a wave of panic rushing through her. Class had only just started, how tired did she have to be to fall asleep within two minutes of the bell ringing? But that wasn't the only part that scared her. The major problem was that Ms. Mendeleiev was the most notorious teacher in the school for administering harsh punishments to those who fell asleep in her class.

Alya couldn't exactly walk up to her and wake her up, it would likely only draw attention to the fact that she had fallen asleep. So all Alya could do was sit there and hope their teacher didn't notice the sleeping student at the back of the class.

"Ms. Mendeleiev? Someone's fallen asleep!" Alya wanted to strangle Lila Rossi more than she'd ever wanted to before. Lila was a liar, that was a fact that had been engrained into the class' brains for years. Unfortunately, since no one believed her lies anymore, she had settled for showing her true colors, making people's lives miserable. Her favorite technique: hurtful truths.

The purple haired teacher's gaze snapped from the formula she was writing and quickly scanned the room, vision settling on the form of poor, sleeping, Marinette. Slowly, the teacher walked forward, her footsteps the only sound in the room.

But, when she reached her desk, the teacher went past Marinette, walking to the back of the classroom. She stopped at the shelves before pulling off an object.

Then, she went back to Marinette and tapped on her shoulder.

The girls stirred, letting out a questioning noise, blinking up at the teacher. She startled back a bit, but stopped when she saw what her teacher was holding.

"Marinette, if you're going to sleep in my class, at least use this." She pressed the pillow into Marinette's hands and walked to the front of the room.

Marinette gaped at the teacher and Alya finally noticed the black bags beneath the girl's eyes. Holy crap... The class started chatting all at once, noises of protest and jealously rising up.

The teacher clapped her hands, returning the class's attention to her, the conversations quieted. "All right, class. As I was saying. When a..."

Alya stopped listening. If that wasn't an indicator that Marinette was hiding something and the teacher's were in on it, she didn't know what was. Finally, Alya let herself focus on the lesson.

Throughout the rest of class, soft snoring could be heard from the back of the room.

~~~

When Alya got home that day, she immediately started brainstorming. Several ideas were scraped instantly, others seemed to be a little more promosing. After about an hour, she decided to see if her friends had come up with anything.

Alya: Any ideas yet?

Rose: I thought maybe we could throw a party and invite her

Alix: prbly wouldnt wrk

Juleka: We could see if she wnts to join a cub

club

Mylene: We could try to invite her to sit with us at lunch. She sits alone right?

Alya: Thats 1 of my top ideas. Main thing is we start off slow ddont want to ovrload her, k?

Alix: Shld I c if she wants to be on my next dodgbal tem?

Alya: 1, learn to spell. 2, that could work

Rose: When do we play next

Mylene: Ivan thought Mr. D'Argencourt said next class, could be wrng tho

Juleka: Worth a shot, maybe it'll cause her to talk?

No?

Rose: I think there's a chance :)

With that, Alya set down her phone and sighed. Do I take a direct approach? Maybe corner her somewhere. But then, there's always the chance that I scare her off... Alya drummed her fingers on her desk when an idea came to mind.

She unlocked her phone and dialed a number.

"What's up, Dudette?" Nino's voice said over the phone.

"Here's the thing, Nino..."

Hello everyone! Welcome to my Hallowen special. *Insert spooky music* Originally, my plan was going to be to release a 10,000-ish word oneshot, but I'm having some trouble with lag, so It's probably going to be a 3-4 parter with each being 3,000-5,000 words long.The second part will be out by at Halloween at the latest.

Fun fact, I've actually been holding on to this story for a while but am only now releasing it as a special for the holidays. For fans who are invested in my main series 'Crime Filled Nights, Moonlit Skies', a chapter is in the works and will be up as soon as it is completed. On the same day, I also hope to post chapter 3 of 'Raven Haired Girls, A Black Cat Guise', so a lot is coming your way.

In case you haven't noticed, I'm trash for the Marichat villain trope. This fic just happens to have Chat as bit more psychotic. Btw, they're in Senior year in this AU. Hope you're at least a bit intrigued, Miracle out!