This fic contains incest, underage, grooming, and eventually exhibitionism. You've been warned.


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This was created from an RP I did with a friend, characters are about 10 years old for Komaru and about 12 years old for Makoto.


Komaru gently knocked on her brother's door before entering. "Makoto?" she asked gently. "I have a question."

Makoto sprung up from his lying position on the bed, taking his headphones out of his ears and pushing his laptop to the side as he did.

"What is it, Komaru?" He asked. She twiddled her thumbs, feeling embarrassed but unsure why.

"Um…my chest is…bigger…than it used to be." She finally said.

"Oh, uh, really?" Makoto sputtered, a blush spreading across his face. "Do you mean-" She proceeded to grope her own chest, feeling some small bumps where there wasn't any before

"It's like when you get a bug bite and it swells up? I don't know…" Komaru said. Makoto watched his sister explore her own chest, having to swallow a little before speaking.

"Well, uh, come over here. Onto the bed." He said, patting the spot next to him. She walked over and scrambled to get onto his bed, before sitting comfortably next to him. Makoto wrapped an arm around her side, pressing him against his body as he spoke. "Well, you're starting to go through something called 'puberty.' Have you heard of it?"

"I…think I've heard one of my friends talk about it." Komaru answered. She thought it over for a second. "Actually now that you mention it…her chest also grew. What is it?"

"Well, you're starting to grow up," Makoto started, trying to ignore the fact that he was slowly growing hard from the feeling of his own sister's soft, warm body pressing up against him. Was she even nuzzling him a little? That might have been his imagination. "And that means certain parts of your body are changing. Part of that means you're starting to get...breasts, y'know, like Mom has."

"OH!" She suddenly shouted "You mean I'm gonna get big like her?" She bounced on his bed happily. His sister's excitement was infectious, and Makoto couldn't help but pull her a little closer.

"Yeah! Usually that's how it works... I think." He said. Silence sat between the two for a second before Makoto spoke again. What was going through his mind was undoubtedly wrong, but a different brain had now thoroughly taken over as he felt his sister. "In fact, now that you're starting to be an adult... I could show you some stuff that adults do..." He eventually said, and her eyes sparkled with innocent enthusiasm.

"Yes, please!" She exclaimed. A lump caught in Makoto's throat. It was seriously this easy?

"Yeah, but you have to promise me a few things. First, this is strictly between us. That means no telling anyone else about this, ever; even Mom and Dad. Second, trust me, and let me take the lead for you. Got that?" He said, and she nodded.

"Of course! There's no one I trust more than you! You just tell me what to do and I promise I'll do my best! Oh, oh, and I won't say anything!" She said with determination. Makoto leaned down and gave her a little kiss on the forehead.

"Now, just hold still and stay calm. I promise this'll feel good." With those words of security, he raised one hand and pressed it against one of Komaru's developing breasts. They were just little nubs, but some part of that turned Makoto on even more. He slightly pinched the skin of her chest between his thumb and index finger, and gave it a light grope.

"Eeep!" She squealed in surprise as she jumped, then started shaking "Hahaha, that tickles!" Makoto put an arm around her back and pulled it a bit closer. Leaning down next to her ear, he whispered in a low voice.

"It does, but trust me, it'll feel wonderful soon."

With that, he gave her nipple a very slight pinch.

"Ahhhh!" She cried out, but she felt a strange feeling run through her body, something new "Woaaahhh…M-Makoto, I feel a little…weird." Makoto put the index finger of his other hand under her chin and lifted her face up to look her in the eyes.

"A good kind of weird, right?" He asked.

"Y-yeah…" She said. "Makoto, your eyes are so pretty!" she said, easily distracted. Makoto was taken out of the moment for a second. Praise! His one weakness!

"I-Thanks, Komaru. You have very pretty eyes too~" With that statement, Makoto leaned down and gave Komaru her first kiss on the lips.

"Mmm!" Komaru felt herself reeling back instinctively, but after a moment, she kissed him back, not really thinking much of it. He was her brother after all!

Makoto couldn't believe his luck as his lips sank into Komaru, and he felt her respond. He was kissing his own little sister, and she was enjoying it! With renewed enthusiasm, he put both hands against each of her teeny breasts and squeezed down onto them.

"Mmmm-!" Komaru heard a weird sound escape her lips, pressed tightly against Makoto's. She felt…weird, and she lightly tapped Makoto on the shoulder, hoping he'd understand she wanted to stop. Makoto pulled back.

"What is it, Komaru?" He asked, concerned.

"I…I feel weird…" She said, and her hand trembled as she brought it down to the spot that felt strange. "Down here…it's kind of…hot…is that normal?" If Makoto was blushing before, what he was doing now was entirely recoloring his face red.

"That's a sign that you're really enjoying yourself~" he told her as he ran one hand off of her left boob and down her side. "In fact, that's the spot where adults have most of their fun with each other. Want to see how~?"

"I-I'm a little scared, but I don't know why…are you sure about this?" Of course, she trusted him, but this whole thing felt a little…weird.

"Komaru, I love you as much as I possibly could," Makoto told her, taking her left hand into his own. "I only do this with you because I trust you to be a responsible woman, and because I want you to be safe while learning about this stuff. If you don't want to, we could stop-"

"N-no! I want to keep going! I want to be an adult!" She said with a look of determination in her eyes. "J-just show me what to do!" Makoto couldn't resist smiling. She was just so cute when she got like this!

"Okay, for this next step. You're going to have to stand up!" She jumped to her feet excitedly and turned to face him.

"Okay, now turn around and close your eyes." He said. Makoto had to actively hide the desire to lick his lips. Maybe it was just the arousal, but everything about his little sister seemed so sexy. The obvious excitement on her face, the way her shirt had stuck to her, the way she stood so eager- "Now, bend over."

"Okay?" She said with confusion as she bent over, until she was able to touch the floor with her fingertips. "Is this good?"

"That's amazing, Komaru~" He said. Makoto's cock was about to burst through his pants. Her little ass looked so wonderful like this! Makoto couldn't stop himself from leaning over, hooking his fingers over the hem, and pulling them down her legs.

"M-MAKOTO!" She squealed, and jumped back up, putting her hands over her cute pink panties. "Wh-what are you doing?" Komaru's response flustered Makoto a bit as he recoiled.

"We have to be naked for this next part, so I was just helping you out!"

"N-NAKED?!" She asked, turning to face him, and bringing her hands to her face, where she could feel herself blushing. "B-but I thought we're not supposed to let anyone see us…n-naked!" Makoto once again reached out a hand, gripping one away from her face and letting her see his affectionate smile.

"That's a rule for strangers, Komaru. Is your own brother a stranger~?" He asked.

"I…I guess, yeah!" She said. She still felt embarrassed, but Makoto probably knew what he was doing. "D-do you want to keep taking them off?" Makoto couldn't decide what was sexier, stripping his little sister himself or watching her strip for him! Oh, the problems that could confront horny older brothers. Resolving his little problem in a moment, he stood up off the bed and walked towards her. Despite being the older brother, Komaru had always been a taller kid, and even now she was just an inch or two shorter than him. To compensate for the difference, he stepped forward close enough to press her hips against the dresser, slightly bending her back as he leaned forward. "Which would you prefer, taking them off yourself, or having me do it~?" He asked.

Komaru felt a sudden rush of that weird feeling again as her brother loomed over her, and she wasn't sure why, but she blurted out "Y-you…"

Makoto chuckled a little as he placed his hands on her hips. He leaned forward to plant another kiss on her forehead before moving his hands up her body. Once he got to the bottom of her shirt, he took a handful of it and started pulling it over her head. Komaru raised her arms to help Makoto take it off. As the shirt slipped off her body, she felt the blush return, now already half naked in front of her brother. With her shirt off, she could now more plainly see how her chest definitely was bigger than it had been a few weeks ago. Makoto gave her a lewd smile before suddenly moving his head down to lick her right nipple.

"A-AH! M-Makoto, what are you-" She tried to ask, but she felt her body shudder in response to what he'd just done. Taking that as a positive response, he let his hands move further down her body as he took a good part of her breast into his mouth, suckling and licking her as he felt the soft skin of her shoulders, back, and eventually her ass. He gave her behind a good grope as he simultaneously released her chest from his mouth.

"I-is this part of the adult stuff?" She asked, before she suddenly moaned, a noise that was very unfamiliar to her, and for some reason, it made her feel even more embarrassed. Her entire body shuddered violently as the heat between her legs increased, and her hands twitched, wanting to touch it. Makoto pressed his hip against hers, grinding the bulge forming in his sweatpants against her pussy.

"Yes it is, Komaru. Doesn't it feel wonderful~?" He asked. "It's very normal, in fact, you make yourself feel really good~" Makoto took a step back, having to exercise every bit of self control in his body as he saw her sister standing there in just her pink panties. "Try putting your hands in your panties." She nodded and put both hands in her panties, at her sides by her hips, then looked up at him expectantly. "Now, touch your vagina. Try rubbing the outside of it." As he spoke, Makoto took off his jacket, gently folded it, and set it on the bed.

"With both hands?" She asked.

"You can do just one, if you think it would feel better." He answered. Makoto took off his shirt as well, tossing it to a corner of his room. Komaru moved one hand to her front, and pressed it gently against herself. Immediately she moaned again as she felt her legs wobble from something shooting through her body. "W-woah…"

Makoto smiled again. "Keep going, it only gets better~" He assured her. Undoing his belt, Makoto's eyes were fixed on the sight of Komaru's hand moving under her panties. She gently rubbed against her lower lips, and had to steady herself against the dresser as she felt waves of that strange feeling rushing through her body. She moved faster, and that made it feel better. She felt her hands get coated in a strange wetness. "Makoto…why is it wet?"

"That's to make it easier for stuff to go inside. Try it with a finger. Just slowly put your pointer inside of you, that's usually a girl's favorite part." He instructed. Makoto shimmied his pants until they were to his ankles, at which point he kicked them off into the same corner as his shirt. Still not having looked at Makoto, too distracted by this pleasant feeling, she quickly pushed a finger inside, but instead of that happy feeling, she felt pain, and quickly pulled it back out. "Owie!"

"You might not be ready for that. There is actually way to help with that, if you want~"

"Sure, what is-" She finally looked back up at him, and was surprised to find him in just his underwear. "AH! When did you…" She noticed something odd, a weird tent in the boxers. "Is there…something in your underwear?"

"That's called a penis. The fact you can see the bulge is a sign that I'm having fun too." He told her. Makoto stepped back in front of her, but this time, he dropped to her knees in front of her.

"Penis?" She asked, and giggled. "That's a silly word!" Makoto pouted as he came eye level with his little sister's panties.

"Well it's not like I invented it..."

"What are you doing down there?" She asked. Makoto hooked his fingers around the hem of her panties and started pulling them down.

"Preparing you."

"P-preparing me?" She watched as her panties slowly fell down her body, and shivered as the chill air of the room brushed against her pussy. Once the panties reached her feet, she stepped out of them. "Hehehehe…I'm…I'm naked! Hehehehe!" she giggled, amused by the situation, despite the fact that she was still blushing. Makoto looked up to his little sister, although he was still transfixed by the sight of her glistening pussy.

"And you look absolutely gorgeous, Komaru~"

"D-don't say that, it's embarrassing!" She said, then stomped her foot and pouted. "Y-you should be naked too!"

"That comes in a bit," Makoto informed her. "First, something special needs to happen." With that bit of warning, he spread her legs with his hands, forcing her legs into a triangle stance.

"H-huh? What are you doing?" She asked, confused.

"Getting you ready," Makoto said, enjoying the way he could tease her with his ambiguity. After another kiss, he stuck out his tongue and licked from the bottom of her pussy to the top, indulging in the way she tasted.

"AHHHHH!" she moaned loudly. "Th-this…it feels so…so…!" Makoto couldn't resist eating her out with greater vigor. He pressed one deep kiss against the hood over her clitoris, and pulled back to look at her. "M-Makoto! D-don't…don't stop!" She begged, not sure where the words were coming from. she shivered, unable to speak as moans escaped her lips, and she held tightly onto his head, her fingers wrapping between his locks as she tried to pull him closer. Unable to pull back, Makoto figured it was time for the last step. After a few more kisses, he stuck out his tongue, and drove it inside of his own little sister's pussy.

"AHHHHHHHHHHH!" She moaned, as a pressure built up inside her body, threatening to release. "Wh-what is this?" She asked, her legs wobbling.

"This is called sex, Komaru~" Makoto moaned as he pulled back. He just couldn't believe how amazing this felt!

"S-sex?" She asked, but then she felt disappointed "C-can you keep going?" She wasn't sure what that pressure she felt was, but it was already beginning to fade, and she wanted it to come back, wanted to know what it felt like when it burst.

"Well, we could finish the way that adults do it. Do you want to~?"

"The way adults do?" She asked, tilting her head.

Makoto stood up again and pressed himself against her. "It's a very special way. If you want to see, take off my underwear for me."

"O-okay!" She said. She walked over and got down on her knees, reaching up towards his underwear. She gripped the hem with her small hands and yanked them down. She jumped as something hard slapped against her face for a moment. She opened her eyes, taking one hand off his underwear to rub her cheek as she looked at what had hit her. Her eyes went wide as she found an intimidating organ standing stiff in front of her, mere inches from her face. "Woahhh…it's so big…" Makoto couldn't help but chuckle a little. He was actually a bit smaller than average, but if Komaru wanted to praise him, he wouldn't stop her.

"Now, go lay on the bed." He instructed.

Still staring in awe at his penis, she walked over to the bed and flopped down on it, slightly spread eagle. "Comfyyy~" Makoto couldn't help but laugh at how adorable his sister was. She was so wonderful to have... and not just because he could have sex with her. Leaning over the bed, Makoto climbed onto it so that his body was over Komaru's. His breathing grew heavy as he loomed so heavily over his little sister, and his cock was practically throbbing with need for her.

"So…what now?" She asked. Makoto let his legs relax and adjusted his hips so that the head of his penis rested against the lips of her vagina.

"Now, I put my penis inside of your pussy, and we have fun like adults do~"

"O-okay!" She said. Hearing him say those words almost made her giggle, but the way his penis felt against her made her feel all tingly

"I need you to relax, and stay calm." He said. Makoto slowly pushed forward, beginning to bury his penis into his sister. With how aroused she was, it was easier than he thought to get inside. But with how small and tight she was, it was also more of a struggle than he thought.

"MAKOTO!" She shouted, as pain shot through her body, radiating from her crotch. "It…it hurts!!" Makoto continued pushing anyway, confident her pain would subside. With one hand, he reached down to massage the hood of her clit. "M-Makoto…it's…it's…" The pain started to fade, and that really good feeling returned. "It feels…good…" She moaned again, and once again, the pressure returned, building up again.

Makoto couldn't respond. All he could feel was an overwhelming desire to make his little sister cum, and he would do everything needed to make that happen. He leaned down and pressed his lips against hers, this kiss being far more forceful and passionate as before. The way she moaned in his mouth made him twitch just a bit, and he began moving in and out of her at a steady pace. She reached up and wrapped her arms around his back, pulling him closer. It felt strange with how he was bigger than her, but the pain was now completely gone, and all she could feel was extreme bliss, bliss she never wanted to stop. That pressure inside her body continued growing, threatening to burst already. It was addicting, she wanted more.

Makoto's pace got as fast as he could, the light slapping sound of his hips connecting with her's resonating throughout the room. He pushed his tongue inside of her mouth, relishing the feeling of control he had over her. A familiar pressure was building in his cock, but he had to make sure she finished first before he could finish himself. As his tongue entered her mouth, she felt overwhelmed by everything she felt, everything she was experiencing, and just like that, that pressure erupted, and she felt extreme bliss unlike anything she'd felt before explode from her body, making a strange noise as she felt any stress or anxiety she could've had felt leave her body. Her body shuddered, rising and arching as it all flowed out like a river, and it felt like minutes before her body finally fell back down onto the bed, leaving her gasping for air, even as Makoto was still kissing her.

Makoto felt his sister cumming around his cock, and it took every bit of self control he had to not finish inside of her right then and there. He pulled out of her and away from her, watching as a bit of his sister's fluids dripped from his cock back onto her body. He took his cock with one hand and frantically began stroking it, the sight of his sister's naked body more than enough material to finish. The way her cum dripped onto the bedspread, the way it coated on her thighs. The gentle rising and falling of her flat stomach and pretty little breasts. The look of exhaustion and pleasure on her face. It was all too much.

"Komaru... I love you..." Makoto managed to sputter out as he finished. Jets of his cum passed from his dick onto her stomach and chest, lovingly painting the gorgeous canvas of her body.

"A-ahh!" She cried out as globs of something warm and sticky landed on her body. Her brain was so addled she was only barely registering what was going on. All she could tell was Makoto had pulled his penis out and then the next moment, the warm stuff was on her body as he was saying. 'I love you'.

"Makoto?"

"Yes, Komaru?" Makoto panted.

"What just happened?"

"We came. That's a sign that two people who love each other had lots of fun together~"

"Ahhh…I love you too, Makoto…" She said, and after a few seconds, exhaustion overtook her, and she fell asleep, her chest rising and falling slowly with her breathing. Makoto couldn't resist the urge. Their parents wouldn't be back until tomorrow, so there was no harm in it. He fell to the bed beside his sister, wrapped her arms around her, and fell asleep naked with his own little sister.