PART 1

(L/N) (Y/N), a first year in Kimetsu Academy. A nice and cheerful girl that attracts anyone's attention with her sunny disposition. She and her best friends; Kanroji Mitsuri and Kocho Kanae were budded 'Kimetsu's Flowers'. The three of them were quite famous in the academy.

A lot of people would like to be their boyfriend/girlfriend, but none of them has the courage to ask. It's not because they're scared to be turned down, they're ready for that. What they are scared of are the people behind the three.

Obanai Iguro, a third year and Kanae'classmate. He likes Mitsuri and a lot of people knows except for the girl. They know how scary he can get so they don't dare approach Mitsuri with him around.

Shinobu and Kanao Kocho, a third year and a first in the middle school section. They are Kanae's little sisters. A lot of people don't even dare to get on their nerves. Even though they always smile, everyone knows that they can and will destroy your life.

And last, Shinazugawa Sanemi. A third year and Kanae and Obanai's classmate. He's a delinquent and was friends with the previous boss. He's a great fighter and can knock out plenty of enemies in one shot. The only reason he's not been kicked out of school is because he's a genius in math. No one can top him, even the teacher gave up on teaching him, Sanemi teaches the class in his stead. He gets paid too.

He's (L/N) (Y/N) boyfriend.

They've been going out for six months. They are a happy couple. But only a few know and only a few notice. They don't really keep it a secret. Just, some people are too into their fantasy that they miss Sanemi walking besides (Y/N) whenever they're together. Or when they walk to school together. Or when they are together during school outings. Or when they feed each other in lunch.

They're stupid.

Anyway, a lot of people have given (Y/N) love letters, but a lot of them aren't answered. Reason; Sanemi always goes to her locker or any other place they could hide it and he rips them apart.

But that's not the topic, have you read the title?

Today was Christmas! Also happens to be (Y/N) and Sanemi's sixth months of being together!

(Y/N) had invited Sanemi's family to celebrate the holiday with her family in their home. But before that, (Y/N) had a date.

And so, she woke up early today and got herself ready, wearing an extra layer of clothes since it was supposed to be cold today. She examined herself in the mirror and nodded, satisfied with her outfit. She took her bag and phone and left her room, only to bumped into her oldest cousin, Michikatsu.

"Heeey." He said in a offended manner, glaring at (Y/N). "Why are you dressed up? Where do you think you're going? Who are you going with? Where are you going? YORIICHI!!!" He screamed and the door at the room besides his opened. "Where is (Y/N) going?!"

"I don't know?" (Y/N) rolled her eyes and hit the oldest twin lightly.

"I'm going out with Sanemi!" She pouted. "Also, the party for later. I already finished decorating with the other's, we only need a few more cups. I need one of you to go out and buy some. Also, napkins too, we're out."

The two groaned, looking at the other, hoping the other would go in the cold air.

"Please~" (Y/N) used puppy dog eyes.

Michikatsu and Yoriichi covered their eyes, hoping to escape (Y/N)'s clutches. "Pretty please~ with a cherry on top!"

"FINE!" Michikatsu gave up. "WE'll go get those things! GOODBYE! DO NOT BOTHER ME!" He exclaimed, his face a little pink. (Y/N) laughed at his reaction and embraced her cousins. Michikatsu tried to get out but to no use.

"Thanks you two!" She broke the hug, walking over to the stairs. "You two are the best! BYE!" (Y/N) disappeared and the two men stood in the hallway with a little smile.

'Heh... she said I'm the best.' They thought, going into their own rooms to change. 'I'm the best...' They had little smiles, ignoring that (Y/N) meant the two of them, not just one.

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"Sanemi!" (Y/N) waved, running over to Sanemi who was waiting. He took off his earbuds, placing them to his jacket and giving his girlfriend a little peck on the lips. "Are you ready! We already finished the decorations last night!"

"Yup." He answered lightly, not seemingly excited. "So, where did you want to go?" He asked, snaking his hand to hold her own. "Are you sure you should be going out today?" (Y/N) looked up at him, wondering why he would ask. "You've been feeling sick lately. It's cold later on. I would've just bought what you wanted and give it to you later at the party, you know?"

She shook her head, snuggling closer to him for warmth. "It's okay! If you saw it then it would ruin the surprise!"

"Surprise?"

"Yup! I got everyone a surprise! Mother and I have been very excited! We worked hard on it..." She paused, looking at the sky as snow fell. "I just hope that you like it..."

Sanemi sighs, putting his arm on her head, kissing her temple. "I'll like whatever it is. Just make sure it's not something too expensive. Don't waste money on me."

She chuckled, dragging him inside the warm mall. "Don't worry, my gift didn't cost a cent! Well, one of them anyway! But don't worry, it's not that expensive!"

The two of them talked all the way to their destination. A gift shop. (Y/N) walked over to the counter and handed the person a paper. He left and soon came back with a small stack of cards, handing it to (Y/N).

"Are these your gifts?" Sanemi asked, taking the cards from (Y/N)'s hold and holding the door for her.

"Yes and no!" She answered, dragging him now to a toy store. "That's just part one! I still have to take the other gifts. I asked the toy store to keep it there since if those three saw them, they would take it and I won't see it until I see the packing on the trash." She chuckled, walking over to the counter, telling him her orders as he left and came back with a whooole lotta boxes. "Ah! Here we are!"

"(Y/N) WHAT THE HECK!?" Sanemi exclaimed, looking up at the tower of boxes looming over them. "How much did you buy!? That's way too much even for those three!" By three he meant the youngest ones (Y/N)'s family.

(Y/N) took one of the boxes, only for Sanemi to take them from her. "It's not just them! Your siblings are also coming over! So I got them something too!" Sanemi hid a smile and muttered a little thanks to her as they moved on to the next place.

(Y/N) stopped in her tracks looking over a clothing shop. Sanemi also stopped beside her, looking at what she was looking at. "...Why are you looking at baby clothes?" He asked, suspicious at how (Y/N) was looking at them with stars in her eyes.

"I think they're adorable!" She exclaimed, walking away from the store. "Plus, mother told me to work with everything from baby clothes to traditional ones. She said that it could give me inspiration!"

'Okay... where did that come from?' He thought, following after her energetic girlfriend.

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"And here is your order, (L/N) -san!" The old lady from the counter came back with three boxes of cake as Sanemi looked at them with his mouth agape. Not because of the amount he was carrying, oh he will carry the world if (Y/N) asked him to. It was because they were at a famous store to the point where a small chocolate box costs nearly 15 dollars. (fact; when my family and I went to Germany, I saw a small chocolate box that cost 15 euros)

"HOW MUCH DID YOU SPEND!?" He exclaimed, almost dropping the boxes and bags he was carrying. (Y/N) got off track a while ago and went shopping. "Don't tell me you used all your money on this!?"

"Don't worry, Sanemi! My parents and my aunts and uncle were the one who paid for these!" Sanemi relaxed, looking at the three boxes of ooey gooey goodness, wondering how they were going to make it home. "Don't worry, I called aunty Mayoko, she's on her way. On the meantime, why don't he get something to eat?"

"How about no." He said, taking the three boxes and carrying them in one hand, the other was holding into (Y/N) and they left the store. As they wandered in the mall, a lot of people kept staring at the tower of boxes Sanemi was holding, but still holding onto his girlfriend with the other.

Someone took a picture and posted it on the internet and immediately went viral.

The of them got hot chocolate and walked around some more, until (Y/N)'s aunt called and they made their way to the parking lot and found their aunt waiting at the black range rover. Sanemi put the boxes on the back and gave the cake to (Y/N) until he went inside and took them from her.

》A.N《

This was how I originally planned things to go. But in future updates for this extra, the baby will also be conceive at August, not October.