From tasko0778's review on the Overview chapter of this fanfic:

Fun stuff. Good writing. I think Chat should get to spend Xmas eve with Marinette and family. And, maybe she gives him a sweater (knitted it herself of course) that she sees in Adrien's room on Christmas day. How's he gonna explain that one?

I love this idea! Thank you for the suggestion! Go check her/him/them/whatever they identify by out! They actually write some stories!

"Chat Noir?" Marinette asked, surprised to see her partner (neighborhood hero technically, since she wasn't transformed at the moment) sitting on the rails of her balcony. She giggled as she watched his ears go back flat against his head.

"Don't feel guilty for being here. You're always welcome."

He finally turned his head. "Hi."

"Hey...what's up?"

"I just...you're comforting for me. Sort of like a rock. B-but a human style rock! Augh..."

"I know what you mean, kit-Chat!" She exclaimed, flustered all of a sudden.

"KitKat? That's one nickname I've never heard before...oh my gosh. KitChat! I'll have to tell it to my lady our next patrol."

Marinette rolled her eyes.

"Did something happen...at home? As a civilian?"

Chat sighed. "I...I ran away to you. You see, this is my second year, but the pain of an incomplete family, and on Christmas at that...it's almost unbearable."

"Oh, my...Chat...Do you want to spend the evening with me and my family?"

"I don't want to intrude."

"You aren't intruding. Come on."

Before he could get a word in, he found himself sitting on the pink chaise holding a mug of hot chocolate.

"Why are you staring at it?"

"Because I've...never had hot chocolate before."

"You what?!" Marinette asked. "Never? Not even when you were little?"

"Nope."

"Hm. I don't want to prod in but I am curious."

"I'm on a diet, in my civilian life. Hot chocolate isn't permitted. But it's rude to refuse something from a guest so..."

He drank the hot chocolate.

"What...what do you think?" She asked quietly.

"It's...good."

Marinette smiled. She liked seeing him happy. He'd been so gloomy this time of year.

"You can sleep over tonight if you'd like,"

"My kwami would murder me and so would my family."

"Alright then, fine. But I want you to return tomorrow, okay? I'll have something for you."

He smiled and nodded.

"You wanna watch a movie?"

"I...sure."

"What's your favorite Disney movie?"

"Beauty and The Beast."

Marinette found the movie and played it for him.

They curled up on the chaise and soon, sleep enveloped them.

Chat woke up to a dark bedroom.

He shot up.

He was in Marinette's room.

He fell asleep.

Oh no...

His father was probably going to wonder where he was! Maybe have sent out a search party! Contacted the authorities!

He scrambled off of the chaise and rushed towards the window, then looked back at Marinette.

"I want you to return tomorrow."

He backed away to find a piece of paper and a pen. Successfully finding one, he scribbled a note for Marinette, then leapt away.

When Marinette sat up, she noticed that Chat was gone.

She was almost a little bit saddened.

When she got up, she noticed a note that he'd left for her.

The handwriting looked fairly familiar.

Marinette,

I didn't mean to fall asleep with you last night. I would have stayed but my father would have been really mad about when I came back (if he isn't already now). I'll come back later. Thank you for the evening, little lady. It was helpful.

Chat Noir

She smiled a little bit.

Sure, it was Christmas morning and it was supposed to be a time of relaxation with her family, but she had to make him something. He deserved it.

Marinette heard a thump all the way from the kitchen.

"Marinette, what was-"

Before Sabine could finish, Marinette squealed and rushed up to her bedroom.

"Hi," Chat said. "You seem excited to see me."

"I am! I made something for you. It's downstairs, come on."

"Marinette, your parents..."

"They won't mind."

"When I rejected you that day..."

"Papa doesn't hold grudges. Now come on."

She drug him downstairs. Sheepishly, he shyly waved at Tom and Sabine.

"You know, we saw you two sleeping together on the chaise. Do you two have something that we don't know about?" Sabine asked.

"No!" The two squeaked. It turned into flurries of embarrassed rambling and excuses.

"Hm...you do have a civilian side, son, right?" Tom asked Chat.

"I...yeah. I do. I just...this is my second year, my second Christmas without my whole family. One of my parents went missing around this time so seeing everyone else...the pain is already there and it only worsens when I see other families." Chat explained.

"He stopped in last night, we watched a Disney movie, and well...he fell asleep. Then I made him something..." She smiled and gave him a folded up article of clothing.

Chat was amazed as he inspected the material. Cashmere.

"Cashmere...isn't this expensive? Did you blow your budget for me?!"

"Luxury cashmere is expensive. This is just regular cashmere. Anyways, put it on."

He unfolded the sweater. It was neon green with the silhouette of a black cat, only it's green eyes noticeable.

He'd seen this before.

Marinette had made him one, but it was yellow and blue.

"Wow...you know, I actually have one of these already but...Chat can have one two."

Marinette smirked. Adrien. She knew it.

"Come up to my room." She said, darting up there.

Chat glanced at Tom.

"No hanky panky please. Not now."

His face burnt up. He shook his head, his long hair shaking, and followed Marinette.

"Hello, Adrien." She said.

"M-Marinette...you know."

"You aren't good at keeping secrets, you know."

He dropped his transformation. "I hate keeping them."

"I know."

"How do you know?"

"Well, I did hear you say that you hated secrets the day we fought Syren..."

"My...Ladybug!"

He picked her up and spun her around.

"I found you,"

"No...I found you, kitty." She said, bringing their lips together. The kiss ended as quickly as it started. Chat wished it would have lasted forever. "Do you like your Christmas presents, kitty?"

He grinned. "You know it, my lady."

I based Chat/Adrien's sweater off of this: s / files / 1 / 1088 / 7528 / products / adorable-kitty-sweatshirt_ ?v = 1554667589 (copy the url, take out all spaces.)