Chapter 1

It was a Saturday afternoon. Lincoln Loud was sitting on the couch with white hair and buckteeth, watching TV as he slouched against the back inside the living room of an apartment complex. His expression was blank as he scratched the scuffle of hair on his chin. He was dressed in a pair of blue jeans, a pair of sneakers, and a white shirt with an orange jacket over it. Lincoln was down with his college classes and was in the middle of some escapism, relaxing his brain after taking an exhausting exam for the mid-term. He was watching an episode of My Hero Academia. The scene where Shoto Todoroki freezing the robots during the training arc made his eyes wide with surprise as he leaned closer to the screen. However, the door opened, and the young man's attention turned.

"Hey, Lynn. How was your run?"

"It was alright, Linc. didn't even break a sweat after running to blocks."

After most of the Loud children had moved out, Lynn and Lincoln decided to rent an apartment as a financial means to save money while they attend college at the University of Michigan. Unfortunately, after Lynn's "transformation", things have gotten a little strange between the two. Sauntering into the living room, Lynn Loud moved to the living room and stood behind her brother. Her brunette hair was no longer bound to a ponytail. Instead, it was styled with much of her long hair brushed to the right side while her left side was shaved. she was dressed in a white sports top that caressed her big bosom and showed off her midriff while her athletic hips were bound to a pair of tight red shorts. the only thing that remained the same were her knee socks and sneakers.

"What the hell are you watching?" Lynn asked. Her brow arched, becoming confused by the contents of the show.

Looking back at the screen, Lincoln could feel his sister's chest on his head. he still hasn't gotten use to her new features over the years. "My Hero Academia. It's the episode where Class 1-A are being put through the Sports Festival and are showing off their powers to the Pro Heroes."

"Linc. You're 21-years-old. Don't you think you're too young to be watching cartoons?"

He flashed her a scowl and counted down his fingers." Okay, first, it's anime. Not cartoons. Second, look who's talking. You're 23 and you still hold on to the same dumb rituals since you were 13." A cross shaped vein formed on his older sister's temple. Wrapping her arm around, she placed Linc in a chokehold. "Lynn! What the hell are you doing?"

"My rituals are not dumb! You take it back!"

Gritting her teeth, Lynn wasn't letting go until her brother apologized. Lincoln was losing breath with his sight turning black. Luckily, he knew a secret of how to get her off him. he reached under and wiggled his fingers. Pursing her lips, Lynn lost control. She started to laugh hysterically and loosened her grip, giving Lincoln the opportunity to slip out and gasp for air.

"Seriously, Lynn. You could have killed me." Lincoln panted. He rubbed his neck while he glared dagger at his sister.

Taking a deep breath, Lynn regained her composure and without warning leaped over the couch, landing on her brother's lap as she laid her body across. "Oh, quit your griping. You know I wasn't going to kill you." She crossed her legs while putting her hands behind, giving her brother a full view of her well-tones abs. "However, if you make fun of my rituals again. I will turn you into a human pretzel."

"Yeah. Yeah. Whatever. I'm not going to take back what I said but I'll still remember this lesson." He waved his hands, brushing it off in a nonchalant manner. However, Lincoln was taken aback by his sister's appearance. "Do you think it's wise to be wondering about dress like that?" he averted his eyes as his face turned red.

She took notice of her brother's flustered face, smiling wickedly as an idea popped into her head. her arms crept over and wrapped around her neck once more. However, this time, it was much gentler as her face got close to his. "What? are you jealous of guys staring at your sister's sexy body?" she teased while poking his cheeks.

"N-no! that's not what I meant! I mean, don't you think you might attract the wrong attention? Leni has the same problem, especially with the clothes she's been wearing lately."

"Yeah, but unlike Leni, I can just kick their asses and teach a bunch of pervs not to mess with me." she was getting closer. Her lips almost reaching his. "Besides, there's only one pair of eyes I want staring at me and I'll be happy to be touch by someone's special hands."

"What are you two doing?"

Lincoln and Lynn leaped off each other. They clenched their hearts with their eyes wrinkled in shock. Turning to the right, they groaned as Lucy was standing to the side. She was their third roommate, attending the same university as a freshman while working for her bachelor's degree in poetry. After all these years, Lucy had blossomed into a fine young woman with her large chest and thick hips that was all bound in a black sleeveless turtleneck sweater. Her hair was styled in a bob, still being a few inches longer to cover her eyes while wearing black lipstick at accentuated her gothic beauty. She also wore a pair of gray jeans and a pair of purple and black striped socks.

"Lucy?! What the hell?! are you trying to give us a heart attack?!" Lynn growled. Sitting on Lincoln's right, she was already back to her normal self with her cheeks the same color as her brother's. "I thought you grew out of that whole 'disappearing and reappearing' habit."

"I have. However, old habits die heart, Lynn. You should know." Lucy moseyed over and plopped on Lincoln's left. She scooted up and leaned her head against his shoulder. "So, what were you two doing?"

"We weren't doing anything, Lucy," stated Lincoln.

They couldn't see it, but Lucy was giving her two siblings a skeptical glare as she crossed her arms, which amplified the roundness of her breasts. "Lincoln. Don't lie to me. you and Lynn were about to do something…forbidden. It was a good thing I stopped you before it escalated into something raunchy. With Leni out shopping and Lori at Bobby's place, someone has to make sure to watch over you two don't do something." Her hand lowered and was placed on Lincoln's pantleg, making him yelped while Lynn fumed. "Besides, if Lincoln wants to have some fun, then there's only one sister who can give him all. He. Needs." a smiled formed on her face. trailing across his leg, Lucy found something that piqued her interest.

Beads of sweat fell from Lincoln's brow. he was about to tell her to stop. However, Lynn had already beaten him to it. "Hey! Cowtits! What do you think you're doing?!"

"I'm just offering Lincoln an alternative. I'm sure he doesn't want someone so…aggressive to keep him company," Lucy smirked. Her remark struck a chord with Lynn and she was about ready to start a fight.

Suddenly, the door flew open and the three of them immediately sat properly, albeit with Lynn and Lucy scooting up against their brother. Their face blushed with their arms crossed and faces pouting. Lincoln, on the other hand, remained flabbergasted as he tried to process everything.

"OMG, Lori. That sale was, like, totes insane. There were so many people grabbing rompers left and right."

Walking through the doorway, Leni was carrying large shopping backs while she lifted her sunglasses. She was dress in a teal halter top that was tightly wrapped around her large breasts, which were at about double D in size, while having a matching colored skirt around her thighs and gladiator sandals on her feet. after flunking out of college, Leni had nowhere else to go. She knew that she couldn't stay at her parents' home, or crash at her other sisters' homes due to an inconvenience. So, she begged and pleaded for Lincoln siblings to let her live with him, Lynn, and Lucy. Finding income wasn't too hard for Leni as she still worked at the mall. She even made more money, designing clothes and selling them on the internet. Her siblings were willing to model for special lines from time to time, despite some feeling of humiliation but they just couldn't say no to their older sister.

The oldest sister Lori followed her younger sister. Her deadpanned glare showing as she slouched in fatigue. "Leni. I was there. I saw the whole thing. it's amazing you didn't collapse while working at the checkout counter."

"Oh, right. sorry, Lori. I completely forgot that you stopped by."

Although Lori did not technically live with her siblings anymore, she would visit them just to check up on them. after getting her degree in law, she and Bobby got a place for them to live but even they would miss their families, even though both would drive each other nuts. She and Leni still looked the same, except taller and more…developed. Lori was dressed in a blue dress suit with a matching skirt and heels with black pantyhose. Being an up and coming attorney, she had to look as professional as possible to get ahead of her coworkers. She was off work and it she just wanted to take a nap before having to drive three hours back to her apartment. So, she kicked her heels off and placed them against the wall next to the door. She and Leni sauntered over to the other, being puzzled by how close the three of them were on the couch.

"You guys seem awfully chummy. Is there some reason you three are sitting so affectionately?" Lori questioned.

"What. can't a couple of siblings just sit and watch TV?" Lincoln kept a cool head. he tried his best not to sound nervous as Lori had become more insightful after finishing law school.

"Lincoln. You three are being intimate with one another. You, Lynn, and Lucy literally look like the main characters from Three's Company." A sense of skepticism echoed in her tone.

"Come on, Lori. It's not a problem that they're, like, close. Besides, I think it's totes cute that they can still get along after all these years." Leni interjected. Her sunny disposition outshining Lori's cynicism.

Lori wanted to rebut that statement. However, she was too tired and wanted to sleep. "Fine. Whatever. Do what you want. Leni, I'll be crashing in your bed for a bit."

"Okay, Lori. Have a nice nap. I'll, like, be sure to wake you up before it gets dark!" Leni waved goodbye with a large grin on her face.

Once Lori was in another part of the apartment, Leni walked over and leaned against the back of Lincoln's head, pressing her large breasts against his neck as they jiggled. Lincoln flushed as he was having a déjà vu moment. Oh, great. Not this again."So, what are you guys watching?"

"Some cartoon Lincoln's been seeing since I came back," said Lynn.

"Anime!"

"Nobody cares, Linc."

Clapping her hands, Leni cheered and wanted to join them. "Ooh~! I love cartoons. Can I watch with you, please?" before they could respond, Leni joined in, sitting on Lincoln's lap while giving him enough room for him to watch his show. "This is just like old times when we would, like all gather on the couch and watch the Dream Boat! Although, we would watch in English. Watching it with words is totes ridic!"

Lynn and Lucy were surprised. Although they didn't look like it, they were seething with rage at the sight of Leni using Lincoln as a chair, especially a sight of where she was sitting in. Lincoln wanted to protest as Leni was starting to grind against his junk and the sensation was concerning for him.

"Ow. Lincoln. Do you, like, have a pencil?"

"N-no. why?"

"Because something is poking me in the butt."

It was bad enough that he was aroused, hearing his older sister pointing that out indirectly was much worse. He just prayed to God that the other two didn't hear that but that was wishful thinking as their daggering glares were redirected to him. Lincoln was sweating beads. He could feel their gazes burning on both sides of his face. all he could think of was: could this get any worse.

Night had come in a flash. Everyone in the apartment had gone to bed. Lori had left and was heading to Bobby. Lincoln was the only one in the living room and right when he turned off the TV, he got up off the couch and staggered to his room down the hall. He yawned and stretched. He had biology tomorrow in the morning. so, he needed as much sleep as possible. However, when he walked into his room, he was jumped back at who was on his bed.

"Hey, bro~. You don't mind if I sleep in your bed tonight, right?" Lynn cooed. She was under Lincoln's sheets, snuggled as a bug and was waiting for her brother to arrive.

Pinching the bridge of his nose, Lincoln grimaced. "Lynn. I got classes tomorrow and I don't have the time or energy to deal with this tonight. Also, we're too old to be doing this. People will start talking if they see us in the same bed."

Lynn pouted. "Oh, you're no fun. We used to sleep together when we were kids and it doesn't hurt to have some occasional kinship." She got up and moved the sheets on the right. "Can't I just stay in for tonight. Something's wrong with the air conditioning in my room and it's too hot to sleep there."

Letting out a sigh, Lincoln waved his arms in defeat. "Okay. fine. You can sleep in my bed tonight but, in the morning, you go back in your bed. Okay?"

Lynn complied. Lincoln took off his pants and jacket, giving his sister quite a show with the former not being aware at how astounded the latter looked. He got into bed and turned off the lights. After telling his sister goodnight, he closed his eyes and went to sleep. Lynn, on the other hand, wasn't asleep. On the contrary, she was waiting until her prey's guard was completely down and after a couple of minutes, she removed her clothes. Her breasts flowing free as the coolness of the air in the room caused her nipple to get hard. She crawled on top of her brother and bit her lips as she stared at his face.

"Linc. Are you asleep?"

Lincoln grumbled as his eyes fluttered open. "Lynn. what time is it?" he turned to his alarm clock ad examined the screen. "It's already twelve in the morning. why did you wake me up?"

With his eyes adjusted to the dark, he gulped at the naked figure before. her body leaned forward, and her breasts were pressed against his chest and before he could push her off, she embraced her lips against his own. Her tongue penetrated his mouth, swirling around as she tasted the contents of his saliva. She moved away and leered.

"Please. Make me feel good, Lincoln. You know you want to." she lied down and spread her legs open in invitation.

He wanted to deny it. he wanted to kick her out and pretend the kiss never happened. However, he knew she was right. he climbed on top and wrapped his arms around her body as he suckled her breasts. He could hear Lynn's stifled moans responding to the pleasure. His cock became hard to the point that it could no longer be bound to its prison. He pulled it out and positioned it over, but Lynn pushed him against his back.

She waved her finger as her face was close to his crotch while hovering her hips over his face. "uh-uh, Lincoln. We're not going to be doing that yet. We got to do a little foreplay first."

Lynn put his cock in her mouth, bobbing her head in and out over the shaft before her tongue swirled around the head. Lincoln tasted his sister. The sweet and saltiness of her fluids were turning him on even more as he bit her clit. They moaned as their tensed bodies became loose. Disgust was still present in the male Loud's stomach, but his lust had taken full control of his body and the taste of his sister was too much to resist. Feeling the pulsing rob, Lynn could tell Lincoln was about to cum and allowed it to happen. He splurged as he yelped. Her mouth full of his spunk while she squirted all over his face. She swooshed his seed in her cheeks, taking in the salty taste before swallowing it down her throat as she came a second time.

Lincoln thought it was over. He thought Lynn was going to stop for the night and wouldn't go through with it all the way. Lynn trailed a finger on he brother's chest as she smiled warmly. She positioned herself on her back and purred. Her final words bringing chills down Lincoln's spine. "Now, let's let the real fun begin."

A/N: Hey, guys. this is Kman134. I'm here with a new Loud House story. after my previous loud house fix came to an end, I wanted to write a new story that did not give me such a...moral dilemma. so, here's Loud House: All Grown Up. this takes place 10 years in the future and shows the Louds having mostly moved out and on their own. the designs of the characters were inspired by the works of Chillguydraws while having elements of TheExistentialist also. I wanted to make them older as the idea of kids having sex started taking a toll on my ethical ideas, which was one of the reasons why I wanted to end my original loud house story. this was originally going to be called Loud House: Dead World and would feature a teenage Lincoln thrown into an animesque scenario as a result of Lisa tampering with space and time. however, while some of that will be in the story, this will mostly be a slice-of-life fanfic that will feature the older Louds on their own, dealing with life-changing events and facing their inner demons and desires. the first chapter will have a Lynncoln scene and will lead to a nightly sexual encounter but instead of Lincoln wanting to use rationality and stop it, he will gradually accept it as he was aware of Lynn's feelings as they both deal with their urges. however, he will have moral dilemmas on the issue and would be a little disgusted but goes along with it. Anyways hope you like it. please, send as many reviews as you like.