Hey! A challenge!
Let's see if I'll make it and how many suggestions I'll get for the days ;)
Not much talking, more uploading!

"And because of this, you girls better watch out!", Marinette hollered, making big motions with her arms, "Or otherwise, if you don't stay nice, Santa Claws will get you and eat all your sweets!"

Alya laughed and pulled her little sisters closer to her chest, cuddling them both.

"Or Maman will just get mad. That's what's more likely."

"But Santa Claws-", Marinette protested, only to get interrupted by Alya's laughter again.

"… Doesn't exist."

"… Existed last year!", she tried again, before Alya released her sisters, pressing them both a kiss on their hair.

"Yeah, yeah, alright, point taken. Still, you two gotta go to bed now."

Ella pouted, Etta following right after her.

"Aw, already? Can't Marinette tell us another story?"

"Of another Akuma?"

Alya firmly shook her head, stretching out her hands to pull them up. They had settled down on the couch after dinner for one episode of their favorite show because it was Friday, the twins snuggled up to both of Alya's sides. Then Marinette had begun telling a story and had, of course, overdone it but their big sister had decided that it was fine because hey, it was the weekend and she was their babysitter for today.

The twins unwillingly took Alya's hands and she pulled, Ella coming to her feet with a frown but Etta just flopped against her big sister's legs, blinking up to her.

"Can't we stay up a little longer?", she pleaded.

While Marinette laughed and already followed Ella to the bathroom, Alya lifted up Etta to throw the girl over her shoulder.

"Nope, no staying up for any longer. I promised to Maman you'd be in bed at 10 in the evening and that is now. We're already ten minutes late!"

Her little sister stifled a yawn (she was very grateful Alya hadn't seen that) and grumbled.

"Please, Alya? You'll get a chocolate from my Advent calendar!"

"Ampf wone opf mwine!", Ella shouted from the bathroom, her voice muffled by her toothbrush, listening up at the possibility of persuading her bigger sister. Alya merely laughed it off, setting Etta down on her feet to give her a small clap on her back, shooing her into the bathroom so she would brush her teeth as well.

"One whole piece? So you'll both be sad tomorrow? Not in my life. And now finish up, your bed's already calling!"

Marinette caught her gaze and giggled, then she cupped her hands around her mouth as the twins didn't look at her to whisper-yell.

"Ella…! Etta! Come to meee!", she said and immediately whistled and turned away with an innocent expression as the twins whipped around to her.

"See, I heard it! So, c'mon. Brush your teeth, Etta.", Alya giggled, amusement twinkling in her eyes as Marinette just barely held in her laughter.

"Ubnfair…", Ella complained before spitting out the toothpaste and washing her mouth out.

Ten minutes later the twins were tucked in, the room was dark save for the dark orange Christmas lamp on their window that was shaped like a star, and Marinette waited outside.

"Goodnight, Ella.", Alya mumbled, giving her a goodnight kiss on her forehead. The little girl smiled.

"… 'Night Alya…", she breathed, her eyes already drooping.

"And goodnight, Etta."

Her little sister sat up as Alya came to her bed, kneeling down beside it.

"Will Marinette stay for the night?", she asked.

"Mhm!", Alya reassured her, "You'll be able to show her what you've got in your Advent calendar."

Etta grinned as Alya held up her blanket so she could slip underneath it again. Then she pressed a kiss to her forehead as well.

"Sleep well, you two."

Ella already breathed deeply and Etta's smile grew heavy.

"… G'night, Alya.", she mumbled, before resting her head on her pillow.

The bigger girl smiled and tiptoed out of the door, quietly closing it.

"Alright, they'll sleep. What're we doing now?"

Marinette already wore a wicked smug on her lips.

"We-… We'll pick out the perfect outfit for you now.", she whispered as they quietly walked into Alya's room, careful to stay silent until they could close the door there as well. Then they talked in normal volume again.

"The perfect outfit for what?"

Marinette's grin grew bigger and she smirked as she pointed to Alya's big year calendar on her wall. The 2nd of December was marked red and Alya only now saw that a heart, that looked suspiciously like Marinette's style, was drawn into the free gap of the day.

"For your date with Nino!"

Alya could merely roll her eyes before Marinette already opened her drawer.

"It's not a date."

"And you're only saying that because you're denying it."

Alya sighed, shaking her head.

"It's seriously not a date. It's not like he'd have the courage to ask me out. We're just both helping out at the same Christmas fair booth, that's all. We probably won't even talk because it's always so busy on Saturdays."

"Still a date~", Marinette sang and Alya knew she couldn't win this.

"Just keep in mind that I'll have to stay warm, okay?"

You can also check me out on Ao3 under the same name (3laxx) and on tumblr under awesomefreckledjesus. And, of course, you can suggest ships or characters for each day here in the reviews, on Ao3 in the reviews or on tumblr, whichever you like!