Summary: Jungkook is starting to go through puberty, but doesn't understand the changes that are happening to his body. It freaks him out, so he seeks out his oldest hyung to give him answers on what's happening to him and his body.

(This was so weird to write) (also this takes place in 2013 when Jungkook was 15-16, but for plot purposes, he's 13 in this. Also, other parts of the timeline are off, saurreh)

Words: 3079

~~~

"Um, Hyungie?" Jungkook's small, timid voice accompanied the gentle tugging of Jin's sleeve, who was busy conversing with Seojin.

They were at the company going over their debut schedules.

Jin smiled to Seojin, before turning to his maknae, smiling down at the young boy. He was only thirteen, so his voice hadn't started to mature yet (the poor boy was starting to get voice cracks, however: a sure sign that he was going to start developing a deeper voice soon).

"Yes, Jungkook-ah?" He replied, keeping the gentle smile on his face. Jungkook was still a child, and he was far from home. Jin wanted the maknae to feel welcome and comfortable, so he always did his best to step in and act as a brother to him.

"Um, c-can I ask you something?" He whispered. He was clearly shy and embarrassed about what he was going to ask, because his ears and cheeks and neck were bright pink, and he was chewing the inside of his mouth while avoiding Jin's eye.

Jin excused himself from Seojin, and lead Jungkook to one of the empty rooms nearby so they'd have privacy - again, Jin wanted to make sure Jungkook stayed comfortable and well while he was away from home.

Once the door was shut, Jin gently turned to Jungkook, once again smiling at him, "now, tell hyung what's going on."

"Er," Jungkook was looking down, picking absently at a thread on his shirt before scratching his other arm nervously.

"Hey," Jin started, placing a hand on Jungkook's shoulder, "it's okay, Jungkook. Take your time. But, don't be scared to talk to me, hyung won't judge you."

"I-I know you won't, hyung!" Jungkook was quick to defend, looking up at Jin with his wide doe eyes, "it's just, um, really embarrassing. I don't know how to tell you."

"Did you clog the toilets?" Jin joked with a smile, trying to ease the boy, "yah, Jungkook-ahhh."

"Hyung!" Jungkook laughed, covering his face, "no, I didn't!"

"Well, what is it, then?" Jin guided, "I won't share this with anyone, Jungkook, okay? You tell me and it will stay with me."

Jungkook sighed, looking at the ground again, "don't laugh at me," he muttered.

"I would never," Jin reassured.

"I-Its just that, um," Jungkook scuffled his feet against the floor, "I noticed that my, um, p-penis is a lot bigger than it used to be. And I was uh, wondering if it was something concerning, because it's really scaring me."

"Ah, I see," Jin smiled down at the innocent boy, who was still looking at the floor, "you're a bit of a late bloomer, aren't you, kook?"

"Huh?" Jungkook said, "what does that mean? Is that a sickness?"

He was looking up at Jin now, worry etched across his face.

Jin chuckled at the question, "no, Jungkook-ah. What's happening is completely normal, it's just that, this usually happens to boys who are a few years younger than you."

"Oh," Jungkook said, with a blush, "so, it's normal? Did it happen to you?"

"Yes," Jin said, rubbing his neck awkwardly, "it happened to all of us."

"'us'?" Jungkook parroted.

"The rest of the boys. I'm assuming it did, at least. It would be unusual and, I must admit, unfortunate, if it didn't. You have nothing to worry about, Kook-ah, okay? You're completely healthy and fine. Now, let's go get something to eat, hm?"

"Okay," Jungkook said, looking much more relaxed now, and smiled up at Jin.

~

"Uh, hyung?" Jungkook approached him again a few weeks later, when they were at the crampt dorm.

"Yes, Kook?" Jin smiled, from where he was folding laundry in their shared room.

"Um, I want to talk to you again."

Jin set the shirt he'd just folded down, and smiled at Jungkook, "let's go to the restroom, then, since it has the most privacy."

Jungkook nodded, and lead the way to the restroom all seven of them had to share.

Once they were in the bathroom, and had shut and locked the door, getting a weird look from Hobi outside as they did so, Jin turned to Jungkook like he had at the company.

"Okay, Jungkook. You know already I won't judge you or laugh at you. What's bothering you? Is it the same thing?"

"Um, no," Jungkook said. And, though he looked slightly less bashful than last time, he still avoided looking at Jin out of embarrassment, "I noticed some, um, hair growing on- well, not on, but like, um, near? Uh, below? No, above, er, well, at the beginning of my, um, penis."

Jin smiled again at Jungkook, who was fiddling with his fingers, "Jungkookie, that's also normal."

Jungkook looked at him, looking mildly surprised, "really?"

"Yes," Jin nodded, "it's called pubic hair. Is it growing at the base of your penis?"

"Uh, yes?" Jungkook said, and then he lifted his shirt and began trying to pull his pants down.

Jin placed a gentle hand on his wrist, giving him a reassuring smile to not embarrass him, "it's okay, Kook, you don't have to show me. This is something that also happens to all boys. And like before, this has happened to all of us - the other, boys, I mean - including me. It's just hair growing in a new place, really. As you get older, there will be more, but you shouldn't have to worry about it."

Jungkook nodded, fixing his shirt.

"Are you okay now?" Jin asked, "you're not worried about anything else?"

Jungkook shook his head, "no, hyung. That was all."

A banging on the door startled them, and Namjoon's voice filtered through, "get out! I'm gonna piss myself!"

They looked at each other, Jungkook giggling and Jin grinning warmly down at the boy.

When they left the bathroom, Namjoon also looked at them for a moment, before shaking his head and slamming the door shut.

~

"Hyungie?"

Jin hummed, whisking eggs with a fork with puffy tired eyes, making breakfast for the boys in the tiny kitchen.

"Can I talk to you?" Jungkook was plastered to Jin, whispering.

Suddenly, Namjoon came strolling in, singing off key purposefully.

Jungkook yelped, and clutched Jin's arm, his face going blazingly red as he avoided looking at Namjoon, who didn't even notice the weird behavior from the boy.

Jin looked down at him in alarm, and saw how uncomfortable Jungkook looked around Namjoon right now.

He guided him to the bathroom like last time, shutting and locking the door, before turning to Jungkook with a warm smile, holding his shoulders gently.

"What happened, Kook-ah? Why did you seem uncomfortable around Namjoon?"

Jungkook shifted on his feet, fidgeting with his hands.

"Come on, baby, I'm not gonna judge you, not one bit," Jin reassured, after a short stretch of strained silence.

Jungkook sniffled, and Jin gently held his chin, guiding the boy's face up.

"Jungkook!" He said, alarmed to see the boy crying, "what happened? Did Namjoon do something to upset you?"

"I-It wasn't Namjoon," Jungkook whispered, "it was me. I'm scared, hyung. I don't know why it happened."

His lip was quivering, and Jin hated how young Jungkook looked.

He looked way too young to be in a band. To be away from home. Away from his family, his classmates and friends.

"Tell hyung what happened, Kook, what scared you?" He encouraged.

"L-Last night," Jungkook sniffled, "I had a dream with N-Namjoon hyung in it."

Jin handed him a tissue, and Jungkook paused to blow his nose before continuing.

"And in the dream, I was n-naked. And I told Namjoon to be naked, too. I-I saw Namjoon naked, without his permission! What's he gonna think of me if he finds out? He's gonna hate me!"

Jin was unsure what to say, he scratched his head for a moment.

"Is that all that happened?" Jin asked, eventually, in a gently way, "you just both were naked?"

"N-No," Jungkook sighed, "I-In the dream, I, um, went over to Namjoon hyung, and I touched his, um, p-penis. And he made weird noises. And then he touched mine and I made the same noises. And- and when I woke up, my penis was...it was like, like there was stuff on it, and it was kind of hard? It was sticking up, and I had to pee but it hurt to. And I'm worried it was a punishment for dreaming of hyung like that."

Jin was blushing from embarrassment as Jungkook recounted the wet dream he'd had of Namjoon.

"Honey," he said, gently, "that's called a 'wet dream', which usually happens when someone is going through puberty. That's just as normal as everything else. And please don't feel too guilty, okay? Namjoon isn't going to hate you if he finds out- just, don't go around telling everyone about it, okay, Kook? Usually, wet dreams stay private."

Jungkook nodded, his doe eyes large and glassy as they stared up at Jin, taking in every one of his words.

"So, do you have wet dreams, hyung? And are they about Namjoon, also?"

Jin flushed, and sputtered for a moment, "Kookie, wet dreams are another thing almost every boy gets when they're going through puberty, or have finished puberty. Of course I've had them. But I'm not comfortable sharing with you the contents of those dreams."

Jungkook nodded, but looked back down, "then, why was I being punished?"

"What do you mean, Jungkook?" Jin asked.

"Why was my penis weird? And why did it hurt to pee? Do I have an infection?"

Jin sighed, but smiled down at Jungkook with tired eyes, "baby, your penis is fine. You having a wet dream made you feel aroused. Arousal happens when something sexually stimulating happens. And that dream, to you, was sexually stimulating. So, it made you aroused. You got hard, Kook. And that liquid was just semen, which is in every boy's penis. It's normal, kook. And so is the pain when peeing. That usually happens when you're hard."

Jungkook nodded, but was toeing at the floor.

"But," he began, "why was a dream about Namjoon 'sexually stimulating'?"

"Maybe because that was your first sexual experience, even if it was a dream?" Jin reasoned, not wanting to think too hard about what made Jungkook aroused, especially if it was his own band members.

Jungkook nodded, "okay. Thanks, hyung."

Jin smiled again, and hugged the still shaken boy.

"Of course, Jungkook."

~

Jungkook had been fourteen now for a week.

It had been awhile since he's come up to Jin.

But today was the day.

Jin was laying in bed, in their new dorm they had just gotten, which meant he shared it with Yoongi.

Jungkook knocked on the bedroom door, then peaked his head in, smiling when he saw Jin.

Jin smiled back, but stayed laying in bed, scrolling on his phone.

"Jin hyung?" Jungkook said, sitting on Jin's bed next to him.

"Yes, baby?" Jin responded, looking at Jungkook as he saw the worry on his face.

"Um, I noticed something weird when I was in the shower," Jungkook stated, picking at a loose thread on Jin's bedsheets.

"What was it?" Jin asked, sitting up to give Jungkook his full attention.

"Um...my balls are darker," Jungkook said bluntly, "do I have a disease?"

Jin wanted to laugh, but he refrained.

He was kind of honored that, a year in, Jungkook was still asking him about every stage of puberty.

"You don't have a disease, Kook," Jin reassured, and opened his arms.

Jungkook crawled in immediately, relaxing against Jin's chest.

"The skin of your balls, called your scrotum, will darken during puberty. That's normal, baby. You don't have anything to worry about," Jin reassured, running his hand through Jungkook's hair.

"Oh," Jungkook said, "I was sure I was going to die or something."

Jin chuckled, "yah, don't say that."

"But it's true!" Jungkook huffed, "yesterday they were normal. But then they were wired."

"It's okay. Sometimes it happens really abruptly. Was it a major color change?"

"I don't think so," Jungkook said, and again began trying to pull his pants down.

Jin stopped him, Golding the hem of his shorts in place.

"It's okay, Kook. Whether it was a big change or a subtle change, it's perfectly normal."

Jungkook nodded, "okay. Hyung, can I stay with you? I wanna cuddle."

Jin laughed, fondly, and nodded, "of course, Jungkook."

~

Hyung?" Jin was in the kitchen of their dorm, making himself some lunch in the calming quiet of the day.

"Yes, Kook?" He responded, glancing at the boy to see he had dripping wet hair and only a towel around his waist.

"I noticed something, hyung," Jungkook said.

He walked over to Jin, then raised both arms above his head.

Jin turned to him, and poked both his armpits firmly, causing Jungkook to flintch, his arms shooting back down, as he giggled happily.

"Hyung!" He grinned.

Jin smiled fondly, "the opportunity was there, so I took it," he said defensively.

Jungkook lifted his arms again, "look at my armpits, hyung," he said.

"I see them," Jin said, looking at the freshly cleaned pits of the boy, "squeaky clean. A good bathing habit to have, indeed."

"No," Jungkook huffed, "look closer. There's something weird going on."

Jin looked closer, and on Jungkook's right armpit were three dark, curly hairs.

On his left were four.

"Oh," Jin smiled, "armpit hair."

"But, why is it dark and long and curly like my pubic hair?" Jungkook asked, making Jin cough from the bluntness of his question, "I only ever had peach fuzz on my armpits."

"Well," Jin began, blowing on a bite of his teokbokki before feeding it to Jungkook, "that just means you've reached another step in puberty, Kook."

Then, he lifted his own arm, and pulled the short sleeve down slightly to reveal his armpit, covered in hair.

Jungkook blinked, "hm, I see. But, hyung?"

Jin fixed his shirt, "yes?"

"Why is my voice different? I was watching our videos from a year ago, and it was different than now. Why?"

"Puberty, again, baby. Voices get deeper as we age."

"Oh," Jungkook said.

"Have lunch with hyung, Kook," Jin said, plating two servings of his food.

~

"Hyung," Jungkook said, bursting into Jin's room just as he and Yoongi were getting changed in pajamas.

Yoongi and Jin both looked, but Jungkook looked at Jin.

"How am I taller than Jimin hyung? Did he shrink?"

Jin chuckled fondly, and slipped a shirt over his head, "no, baby. You grew."

"I grew?" Jungkook asked, puzzled, "but, how?"

"We always grow, Jungkook. But, during puberty, we grow a lot faster. Remember the other night when I was massaging your feet, because they hurt really bad? Those were growing pains because of how quick you are growing."

"Oh," Jungkook said, "well, I also noticed something weird."

Jin smiled fondly, internally chuckling at the familiar phrase.

"My face has weird dots. And they're raised and they hurt. And I tried to pick one off but stuff came out."

"That's called pimples, Jungkook," Jin replied, "or acne. That also happens during puberty, and you will most likely have more acne for the rest of your life, though not as much once you get older. I'll teach you how to take care of it later."

"Oh," Jungkook replied.

Yoongi was just looking at then confused. Shouldn't Jungkook know these things?

"Hyung," Jungkook said, "can I sleep with you tonight?"

Jin nodded, "sure, baby."

~

"Hyung, something's weird," was the first think Jungkook said to Jin after he got back.

Jungkook was now fifteen.

Jin had been away for a week, and hadn't heard much from Jungkook.

But as soon as he got back to the dorm, Jungkook ambushed him in a hug, and that familiar sentence was the first think out of his mouth after a full minute of them silently hugging.

"What is it, Kook?" Jin asked, hobbling into the house since Jungkook refused to let go.

"Well, there's hairs on my face. But they aren't like pubic hair. They're thicker and straight. And I'm getting pubic hair on my chest, I think."

"Facial hair and chest hair," Jin said, sitting on the couch with a lapfull of Jungkook, "are part of puberty."

"So, you have facial and chest hair, too, hyung?" Jungkook asked.

Then, he pulled his shirt up, "do your hairs look like mine?"

Jin was already beginning to doze off, from the long plane ride and the exhausting trip he'd had.

He looked at Jungkook's chest, and could see several hairs scattered along his chest.

He lifted his own shirt, and Jungkook stared at the stubbly chest.

"Huh?" Jungkook said, confused, "why is your hair so...so short? And why is there so many?"

"I shaved my chest a few days ago, so it's started to grow back," Jin responded, his eyes closed from exhaustion, "and there's so many because I'm a full grown man. And full grown men have lots of chest hair."

"What about your face?" Jungkook asked, "look at mine."

Jin opened his eyes, and saw a few short hairs on Jungkook's chin.

"Nice, Kook," he said, then grabbed one of Jungkook's hands, guiding his pointer finger to his chin.

Jungkook felt around the skin, and gasped qyietly.

"It's so rough!" He exclaimed, perplexed.

"Because I shaved two days ago," Jin replied, "so the hair is coming back like on my chest."

"I didn't know you had facial hair," Jungkook admitted, bashfully.

"All of us do." Jin mumbled, laying against the couch and holding Jungkook steady with one hand on his back, his eyes closed, "but we all prefer keeping it shaved. You don't have to shave yours, when you start getting more, if you don't want to. Same with your chest. If you do want to shave it, however, please let me know so I can teach you."

Jungkook nodded, and laid against Jin.

"Let's sleep, hyung."

"Let's," Jin replied.