"GOOD MORNING EVERYONE!!" (Y/n) greeted the upper moons cheerfully while running to the kitchen. "Ara ara! How's your sleep little one?" Douma asked carrying her in his arms "It is good! I have a nice dream" she replied.

"That's great!" Daki said. "Good morning, (Y/n)-chan" Akaza greeted. Douma placed her down on the chair, "Here is your breakfast" Daki grabbed the plate it was her [favorite breakfast]. "Who made this?" she asked while having a bite. Douma pointed at Kokushibo who was just standing in the corner.

"Why? Is it gross?" Douma questioned. "It's-" (Y/n) had another bite while everyone in the room was waiting for her answer. "It's so delicious! I hope you make me more Kokushibo-san. Thank you!"  "Look! I finished all of it"

"Are you blushing?!" Douma asked, (Y/n) just chuckled and Kokoshibo just carried her in his arms. After a few teasing on Kokushibo, Muzan entered the room.

"Daddy! Good morning" "Good morning sweetheart! Are you done eating?" she just nodded. "Good girl" he patted her head. Muzan sat on the chair and (Y/n) get down from Kokushibo's arm to sit on her Daddy's lap.

"Do you have something to say?" Muzan asked. "I met a new human friend and among all of the humans that I met he is the only one who doesn't bully me even his family"

"That's great" "Are you not angry? That I made human friends?" she asked. "I'm not sweetheart. You said that he doesn't harm you right? He makes you smile so, it's fine" (Y/n) hugged him as Muzan kissed her cheeks.

"I want to bring him here but I'm not allowed to do so" "Who said that you can't bring him here?" He said. "Eh? I thought I'm not allowed to bring other people here? Especially humans"

"It's fine, sweetheart. You know the rules just don't spill anything to him about our identity and don't wander around okay? And besides, I want to meet him too"

"I love you, daddy. You are the best" she said while smiling. "Aww! My daughter is so adorable. I like it when you smile like that" he said while pinching her cheeks.

"Are you not going to visit your friend?" Muzan asked. "Yes, I will" she replied. "Alright. Akaza, escort her there" "Yes, Muzan-sama" Akaza bowed before they left.

*    *   *

Akaza and (Y/n) arrived at their destination:

"I'm fine here. There's strong sunlight there so, you can't pass there. Thank you, Akaza-san" Akaza dropped her in front of a small village "Oh wait, lend me your hand" He put money in her hand "What's this for?"

"Call me at the nearest payphone if you are going home" "Okay! Thank you" "Take care" they waved at each other as (Y/n) walked to her friend's house.

She entered inside his home as her friend greeted "Morning (Y/n)" "Morning Kuroo" 

"Hello dear! Have you eaten yet?" Kuroo's mom asked. "Hello, auntie! Yes, I already ate" she answered. "That's good, (Y/n)-chan" Kuroo's dad said.

"We are going upstairs now. Mom, dad"  his parents smiled as they went to Kuroo's room.

"So, you told your dad about me?" Kuroo asked while they were playing blocks. "Yeah! He said that you can go to my place as long as we don't wander around that much"

"THAT'S COOL! Now I can say to your dad that I will marry you when we grow up" he exclaimed. "Don't you dare! And I have no plan of marrying you" Kuroo just chuckled.

"So, can I go to your place today?" "Sure! He said that you can visit there anytime"

Kuroo dragged her downstairs. "Mom, dad we are going to her house" "Kuroo!! You don't even know how to go there!"

"But auntie, can we go t-to my place?" "Of course, I hope you have fun there"

They went out and (Y/n) called Akaza on the payphone. He arrived in a second and was surprised that her friend was with her. Kuroo greeted Akaza with a bright smile and they entered the car.

*    *    *

They were in (Y/n)'s room, Muzan was working when they arrived so they hope that he would go home early. "Hey! Look what I have found" Kuroo grabbed something from the bookshelves, he showed the Periodic Table Chart to (Y/n). "Come on, Let's study this"

"Or do you mean I memorize that? You always bring that up out of nowhere! I'm not smart like you" "That's why I will help you. Sit there" they sat at her study table and started to study the Periodic Table.

A few minutes later

"See? You got it!" Kuroo cheered as so as she. Then Muzan suddenly arrived in her room, (Y/n) greeted him immediately.

"Daddy! This is my friend, Kuroo. Kuroo, this is my daddy" "Hello Mr. Kibutsuji, nice to meet you" Kuroo bowed. "Oh, so that's your friend. Nice to meet you too" Muzan smiled.

"So what are you guys doing?" Muzan asked. "Kuroo helping me study the Periodic Table" "Study?! The Periodic Table?!"

Muzan asked Kuroo if how old he is and was surprised that he was just the same age as his daughter. "I already memorized it before I met (Y/n)" "Yeah! Kuroo always help me study anything"

"I see, that's why you are getting clever nowadays. Thank you, kiddo"

Muzan was about to leave them when Kuroo spoke. "C-can I. . . Can I marry your daughter when we grow up?"  "Hey! Are you serious?" (Y/n) said. "I promise I will protect her and serve her so can I?" he added.

"You just met me then you already asked me that kind of thing? You have guts, kiddo" "But, enjoy your life as a kid first" he flicked him on the forehead.

"If she cries because of you, I will kill you" then he left.

"See? He permitted me!" He cheered. "I was nervous for a sec" (Y/n) said placing a hand on her chest. "You worried about me?" "NEVER!"

After almost half a day of hanging out in (Y/n)'s place, Akaza escorts Kuroo to his home.

*   *   *

Before (Y/n) go to bed, Muzan asked her if how did she meet Kuroo

FLASHBACK

(Y/n) was walking to get the present for Muzan. She was crying because her present for the upper moons got broken by the other kids. 

"Oi kid!" a little boy called. She doesn't know if she's the one who's calling or it's just a hallucination just but she just kept walking.

The kid called again but she ignored it again. "I'm calling you why are you ignoring me?!" A bed-haired boy appeared. "AHHH!! A ROOSTER! STAY AWAY" she yelled.

"I'm not a rooster!" he defended. "But your head looks like a rooster"

"Why are you crying by the way?" (Y/n) told him about her present got broken by other kids. "Don't cry. I'll accompany you to get your dad's gift. What is your name?"

"(Y/n) Kibutsuji. You?" "I'm Kuroo Tetsurou. If we see those kids I'll punch them for you"

And they walked through the shop to get the present. Before (Y/n) go back to Akaza, Kuroo said something to her. "Before you leave I have a present for you too" "What is it?" and

"You being my friend" "I don't know that rooster can make friends with human"

"Ouch! So, You don't want?" "I didn't say no"

They shook hands and Kuroo said "You can go visit here anytime you want" "Sure!"

While (Y/n) walking away "Merry Christmas! Next time your present is me being your husband" Kuroo yelled.  "Merry Christmas! And you will never be my husband"

Since then, (Y/n) always going to Kuroo's house whenever Muzan is working.

Back to the present

"You are happy?" she nodded. "I'm glad! It's time for you to sleep"

Muzan wrapped a blanket on hers "Good night, sweetheart" he pecked her forehead. "Good night, daddy" he turned off the lights and left her room.