A little different than normal but I've been reading a lot of child reader and child BTS and I freaking love it it's so cute ÚwÙ

Namjoon was in his studio trying to write some new songs for a new album coming up. He was going over some new lyrics he wrote when he got a surprising phone call.

"Mom?" He answered. He hadn't really heard from his parents much aside from his mother telling him about his new little sister and trying to make sure she knows who he is.

"Hey, Namjoon. How are you?" She asked over the sound of crying.

He furrowed his brows. "I'm good. Why is Y/n crying?" He asked about his sister.

His mom sighed. "That's what I called you about. Me and your father are hitting a bit of a... Rough patch you could say. We're fighting too often and we both agreed that we didn't want her around that. We were hoping you could take her in for while? Just until we either fix things or... Well, you know."

His mother's words made him extremely upset. Not only because his parents might split but because his little sister was having to be there for it. "Yeah of course. I just need to make a few calls and then you can bring her."

She let out a sigh of relief. "Thank you, Namjoon."

"No problem, mom. Start heading over because it will take a few hours."

"Alright. I'll see you in a bit."

He told her the address of the dorms and they said their farewells and hung up. He sighed before he called Bang PD and explained the situation. It was unusual to say the least but Namjoon was allowed to have his sister with him in the dorm as long as he made sure she didn't cause trouble and was taken care of. Namjoon made his way back to the dorms to prepare for his sister. The guys were off doing their own practices and such so he'd have to tell them later when they got back.

After a few hours his mom showed up with Y/n. Poor girl had a red face from crying so much. She hugged her mom, her face buried in her shoulder until she heard her brothers voice. The three year old turned to look at him and made grabby hands for him to carry her. He gave her a small smile before taking her and she wrapped her tiny arms around his neck, snuggling into him for comfort.

Their mom chuckled a bit. "She always did like you best." After looking at her two children for a bit she shook her head fondly and went back to the car to get Y/n's things. He held Y/n with one arm and tried his best to help his mom carry in things with the other. He set the things next to his bed and then hugged his mom goodbye. She pecked Y/n's head and the little girl waved with a little sniffle and a tiny "Bye mama." And then she was gone, leaving Namjoon with his little sister hoping everything would turn out okay.

He turned his head to look at her to find her already looking at him with big e/c eyes glossy with tears. "Hey there, little one. It's gonna be okay. Don't cry alright?" She gave a little nod and he smiled, wiping away the tears on her chubby cheeks. "Why don't we get you something to eat and then you can take a nap? You must be tired." He chuckled when she yawned a bit. He made her a simple snack and then laid on his bed with her next to him. He hummed to her whatever song came to mind until he was sure she was asleep. He waited in the living room for the guys, keeping an eye and ear on his door in case Y/n woke up and needed him.

About an hour later they came back almost at the same time. They all greeted each other before Namjoon stood up from the couch and cleared his throat to get their attention. "So, I have something to tell you guys. I-"

"You're gay." Yoongi interrupted.

"What?! No! Where did you even get that?" Namjoon asked bewildered.

Yoongi shrugged. "I just guessed from how nervous you where."

Namjoon just sighed and shook his head. "No. What I was trying to say was-"

"Guys!" He's cut off once again but this time by Taehyung. They all looked at his outburst and Namjoon widened his eyes seeing Y/n in Tae's arms. "I found a baby in mine and Namjoon hyung's room!"

Jin looked at Namjoon. "Why is there a little girl in your room?"

"That's what I'm trying to tell you." He lightly laughed at Y/n trying to slowly get away from a beaming Taehyung by leaning as far back as her tiny body could go. He took her from Taehyung making the younger whine a bit. "This is my little sister, Y/n. Family issues means she's going to be staying with us for a bit. Y/n, these are my friends. Say hi."

She eyeballed everyone a bit warily, not used to meeting so many people at once like this, before she raised a small hand and gave a little wave. "Hewo."

"She's so cute!" Taehyung pretty much had heart eyes as he awed at her little action and everyone else agreed that she was definitely cute.

Namjoon was glad that they all seemed to be accepting of his sister staying with them. She would be sleeping in his and Tae's shared room, much to Taehyung's joy.

*Time slip brought to you by the cuteness that is widdle Y/n ÚwÙ*

After a few months Y/n had unsurprisingly gotten comfortable and very attached to the members of BTS but her older brother Namjoon is still her number one favorite.

Namjoon was getting ready for a vlive he was doing by himself. They had released a trailer for their upcoming album and were going to go on tour soon and he wanted to talk about how excited he is for it. After a few minutes he was ready for the vlive and so he went to his studio to not be bothered by the others.

Things were going great! He talked about the new album a bit but didn't reveal any spoilers and then just chatted a bit about the other members. He was reading some comments when he noticed one say something about a shadow on his door. He turned and looked but didn't see anything and shook his head. A few minutes later More comments came up of the shadow but also a TINY shadow. He turned and saw it just before it disappeared with a small laugh and a shake of his head.

He turned back to the camera. "I'll be right back." He got up and went to the door. He waited until the 'shadows' were right in front of him before he quickly opened up the door. Jimin jumped back in surprise and Y/n squealed with loud giggles. Namjoon scooped her up and tickled her a bit making her giggle more. "What do you think you were doing little miss? Huh? Being sneaky?"

She giggled as she tried to push his hands away. "It Chimmy oppa! No me!" She caught her breath as Namjoon playfully glared at Jimin.

"You little snake!" Jimin playfully yelled at Y/n. "Why would you tell on me like that?"

She wrapped her little arms around Namjoon. "Najoo oppa my favit."

Jimin put a hand over his heart feigning hurt. "I'm not?" She shook her head. "Then which one am I?" She took a second to count on her fingers and proudly held up three. "Three? Who's number two?"

"Taetae." She said shyly. Even though she was wary of him at first she really grew attached to him.

"Tae?!" He turned around and yelled for Taehyung. "Taehyung! How are you Y/n's favorite above me?!"

Namjoon shook his head with a little sigh. "Sometimes I think you're more mature than them. Come on. You can stay with me for the rest of the vlive." She giggled a little as he shut the door and sat down in his chair and sat her on his lap. He took a quick glance at the comments and was unsurprised to see it blown up with talk of the little girl. The whole interaction with Jimin was seen by everyone watching the vlive.

"Alright everyone. This is my little sister Y/n. Y/n, say hi to ARMY." Namjoon said.

The little girl looked up from playing with Namjoon's sleeve and looked around for anyone. "Where, Najoo? I don see no ami." Her eyes roamed all around the room, not noticing the video he was taking, looking for the lovely fanbase that was always so nice.

Namjoon chuckled. "No, not in the room here. There." He pointed at the camera and and her eyes lit up seeing herself and her brother.

"Dat me! Dere oppa!" She said excitedly.

"Yes that's me and you and ARMY is able to see us there. Like a video but live."

"Ohhh. Hi ami!" She waved with both hands. Namjoon chuckled and looked at the comments.

"They're saying hi back! Good job, N/n!" She giggled and clapped her hands. "They wanna know how old you are. Can you tell them?"

She nodded and carefully counted her fingers. "Dis many!" She proudly held up four fingers.

"Great job!" She smiled widely at the praise. Namjoon gave her a little toy that he kept in his studio and continued to talk to ARMY about things.

After about 20 minutes he was getting ready to say goodbye and end the vlive when a comment caught his eye. "'Will Y/n be with you on your?'" he read. He thought about it for a moment before nodding. "Yeah. I wouldn't want to leave her at home with a babysitter for so long and she's going to be staying with for who knows how long do yeah. How does that sound, N/n? You wanna go on tour with me and the guys?"

"Yeah! I wanna see ami!" She cheered happily. He chuckled.

"That settles it then! She's coming!" After a few more minutes he said goodbye to ARMY and ended the vlive. "Alright, little one. Time to go eat dinner." He stood up and carried her out of his studio only to be met with Jimin yelling at Taehyung and Taehyung cheering in victory. Namjoon shook his head and sighed. He looked at Y/n. "You're definitely more mature." He laughed a bit before he headed down the hall to try and diffuse the situation.

A/n
This was so cute to write! I loved this ÚwÙ I'm kinda wanting to do something where little Y/n is on the tour with them. What do y'all think?