Lincoln couldn't fuck his sisters.

At least, that's what he told himself. Still, ever since he started going through puberty, the desire was there. Lincoln had always viewed his siblings as what they really were to him— family. The thought never once crossed the white-haired boy's mind to see his sisters as sexual partners. Unfortunately, that changed, and all it took was one mistake.

It started on a seemingly normal morning. Lincoln was running late while getting ready for school, and had been rushing through the house, scrambling to get ready before Lori drove off without him, leaving him to walk to school on his own.

Where did I leave my backpack?!, thought the boy. He dug like a dog through his room, throwing things behind him without a care. He needed to find his book bag in the next five minutes, and if not, he'd be left in the dust and be forced to walk to school.

Just then, Lincoln froze. After a moment, he slapped his face, realizing his stupidity.

It's in Lynn's room!

Lincoln was right. The previous night, after he had returned home from school, Lynn greeted her brother at the doorway. The athlete desperately wanted somebody to help her convince Lucy not to adopt another bat. Feeling bad for his sister, the boy reluctantly agreed, and was immediately thereafter dragged upstairs in into Lynn's room.

Lincoln had a long chat with Lucy about how pets are a big responsibility, and that she was busy enough as it was taking care of fangs. While he explained this, the 11-year-old had taken his backpack off since it was beginning to get uncomfortable. That day, he brought back home three textbooks, which was made evident as the bookbag started to weigh down on him.

Eventually, Lincoln was able to talk Lucy out of the idea. He went back downstairs, eager to play a video game he had purchased recently. And, of course, Lincoln had forgotten about his backpack, leaving it abandoned in Lynn and Lucy's room.

This memory came flooding back to him as he desperately looked through his room. Remembering the backpack's location, he quickly ceased his search, and ran over to Lynn's room. The Loud residence was usually, well, loud. Of course, since Lincoln knew that all of his siblings were in the car waiting for him, the home was unnaturally quiet. Lincoln quickly opened Lynn's door. He walked in, and began to look for his backpack, when suddenly—

"Eeeee!"

A high pitched scream echoed throughout the house. Lincoln looked up in horror, and saw none other than Lynn, his 13-year-old sister, completely naked and sitting on her bed.

The white-haired boy completely froze. He looked forward, dumbstruck as what was right in front of his eyes. Sure, Lincoln had seen some of his sisters in their underwear before, but this was completely different. Lynn was wearing nothing to speak of. Lincoln studied her fit, slim body. She had breasts, but they were relatively small. Still, they were there, and were the first pair Lincoln had seen. The boy couldn't help but to simply stay still, frozen in awe at what was right in front of him.

Another cry filled the air, bringing Lincoln out of his trance.

"I'm getting dressed! Get out, Lincoln!".

He didn't need to be told twice. Lincoln put his hands over his eyes, turned around, and ran out of the room, all while repeating "Sorry, sorry!".

Throughout the day, Lincoln had trouble paying attention in class. Well, trouble was an understatement. The boy was unable to focus at all on his studies. All that went through his mind were the events that transpired that morning. Lincoln, even until the end of the day, felt a deep embarrassment for walking in on Lynn like that. He had just assumed she was in the car with the rest of their siblings. But, more importantly, Lincoln felt a new desire…

...Lust.

He wanted to see Lynn naked again. He wanted to play with her breasts, to feel them in his hands. Were they soft? Were they squishy? Lincoln had no clue, but he wanted to find out, and desperately so.

The 11-year-old quickly pushed these thoughts away. No, he thought firmly. Stop thinking about it! Lynn was his sister, after all! Why was he having these thoughts about her? Was he a creep? A pervert?

Despite his best efforts, Lincoln was unable to keep the thoughts at bay. His sick, lustful fantasies played on repeat in his head throughout the school day, and they continued on his walk home.

That was two days ago. In his room, sitting on his bed, Lincoln shook his head hopelessly as he recalled the day it all started. Ever since then, the poor child was unable to control himself. He needed more. But, the reality was clear; that was impossible. Lincoln only saw Lynn like he did because of an accident. Even if he wanted to, it would be impossible to recreate the situation unless he spied on her, and even Lincoln's rampant fleshly desires weren't enough to make him stoop to such low a level. He would just have to weather the storm. These feelings wore off eventually, right?

Knock, knock.

"Come in," Lincoln said blankly.

None other than Lynn opened the door. The athlete poked her head in Lincoln's room. "Hey… can we talk?".

Lincoln began to sweat. The boy had been actively avoiding Lynn ever since the incident. He knew that if he tried to hold a normal conversation with her, he's end up stuttering or come close to having a nervous breakdown. He knew that he'd be unable to think about anything other than her body if he talked to her.

Just as he was about to shoo Lynn away, the athlete walked into Lincoln's room, uninvited. Lynn looked out into the hallway, seeing that is was empty. She closed Lincoln's door.

Crap!, thought Lincoln. "W-What do you need?", he managed to spit out.

"Remember when you accidentally walked in on me getting dressed two days ago?".

Lincoln gulped. "Uh… y-yeah. What about it?"

"Well… I've just been thinking… since you got to see me naked, I think it's only fair that I see you naked… right?".

What.

Lincoln knew that Lynn was smarter than this. Obviously, that logic just didn't add up. It was stupid and didn't make any sense. Moreover, the white-haired boy knew that Lynn knew that he knew this too. Why did she bother, then? The answer was simple. Lynn was testing the waters. She had the desire to see him naked, and when he realized this, the 11-year-old couldn't help but to blush profoundly.

Then, another thought coursed through his brain. If he entertained Lynn's request, and one thing lead to another, he could actually end up seeing her naked again! And, this time, it would be no accident. The very thing he had been fantasizing nonstop about for the past two days, in this very room, could become a reality!

He'd just have to play his cards right.

"I mean, it's only fair right?", Lynn said sheepishly.

With a boost of newfound confidence, the initial nervousness brought on by Lynn's sudden appearance started to melt away like snow in the sun. Lincoln sat up on his bed.

"Uh… yeah. I guess it is".

Lynn grinned. "Well, what are you waiting for?".

Was this really happening? What if somebody walked in on them? Right now, their mother was out with Luan, Luna, Leni, and Lori at parent-teacher conferences. Their father was downstairs cooking. As for their younger siblings, they were all either out at a friend's house or helping dad prepare dinner.

But, despite the riskiness of the situation, and the severe consequences that the siblings would have to bear if they were caught, Lynn and Lincoln knew that this would be one of the very few chances they would get to be alone. Because of how many family members they had, their time together without the chance of somebody popping in on them without notice was stretched thin.

It had to be now.

Lincoln hopped down from his bed, standing in front of Lynn. He looked down and off to the side, embarrassed.

Lynn flashed a smug smile. "Well? We don't have all day, Lincoln."

The boy sighed. He slowly unbuttoned his shirt, looking down at his hands so that he could avoid looking at Lynn. He couldn't bring himself to look at Lynn; he was too abashed to do so.

Once his orange polo was unbuttoned, Lincoln sheepishly removed it from his body, throwing it on the floor. He felt a cold breeze as he stood in front of his sister.

Lynn giggled. "Look at me, silly."

Lincoln looked up. His athletic sibling looked back at him with eyes like saucers. The Loud brother was not exactly the athletic type— the most he ever exercised was walking Charles around the block or infrequently riding his bike to the park. Needless to say, he didn't have a six-pack, or anything close to one for that matter. Still, Lynn looked like she was enjoying what she saw.

"Do… do you like it?".

The athlete reached her hand out, and gently ran two fingers up Lincoln's chest.

"You're… Lincoln, you're amazing". Lynn's cheeks turned red. She smiled slyly.

Lincoln's blush intensified. His cheeks felt like they were on fire.

"Now, take off the rest".

Lincoln was never the most confident about his penis size. When hard, it was around six or seven inches, and the boy didn't know if this was big or small. As he took off his pants, though, Lynn's first glance at it light her face up with joy.

As Lincoln had predicted, one thing did lead to another. Before he knew it, he was sitting back down on his bed, completely naked. Lynn, who was still fully clothed, sat next to him on the bed as well.

"Are you sure you want to do th—"

"Shhh," interrupted Lynn. She held up her pointer finger and put it to Lincoln's mouth, silencing him. "I've been sure for years, Lincoln. You're my nicest sibling. You've always been there for me after a bad game… you've been the only one ever willing to help me practice my sports, even though you end up with bruises most of the time afterward… Lincoln… I'm sure this is what I want."

Lincoln wasn't about to argue. He saw that Lynn clearly wanted this as bad as he did. A warm feeling grew inside of him, but it wasn't lust… it was love. He felt wanted. He felt like just by existing, just by being himself, he made Lynn's life better.

And, fuck, that made him feel nice.

"Now, shut up and follow my lead."

Before he knew it, Lincoln and Lynn had locked lips. Lynn kissed passionately, and Lincoln returned the sentiment.

The white-haired boy had a little experience. After all, he had pecked Ronnie Anne on the lips in public at Jean Juan's French Mex Buffet. But, this was different. Sure, this time around he was kissing his sister, but the difference he felt was not because of his partner; the difference he felt was the passion. As the two made out, Lincoln felt like Lynn was unleashing feelings that she had bottled up for far too long.

This is what Lynn wanted.

This is what Lynn needed.

After several minutes of perfect bliss, things started to escalate. Lynn began to rub her hands up and down Lincoln's chest, and, taking this as an invitation, Lincoln slowly began to do the same to Lynn. Their makeout's intensity increased. The two went at one another like wild animals. As he put his hand under Lynn's shirt, Lincoln started around the waist, grabbing and squeezing it playfully. The boy made his way upward, and, eventually, started to reach his hands up into Lynn's bra. He grabbed Lynn's breasts, and gave them a squeeze. They felt undeniably soft as he groped them in his hands.

Lynn suddenly broke away from the embrace.

"No!", she whisper-yelled, careful not to attract the attention of their family members downstairs.

"What's wrong?", Lincoln asked, concerned. Did he go too far?

"No… not like this". Lynn smiled. Before he knew it, Lincoln saw Lynn remove her jersey and bra in one quick motion. She threw it next to her on the ground.

For the first time, Lincoln was able to get a good look at Lynn's breasts. They were small, sure, but Lincoln thought they were perfect. Her nipples were perky— very perky. They looked as if Lynn had been wearing exclusively sports bras forever.

Lynn blushed. "I'm sorry… they're so small…" She sighed. "I know you hate them".

Lincoln quickly covered his mouth, and laughed. He laughed so hard that Luan would be proud. The boy had trouble keeping himself together, and he had even more trouble simply keeping his volume low.

Lynn looked at him with honest confusion. "What… what's so funny?"

Lincoln got a grip on himself. He put his hands on his sister's shoulders, and looked her in the eyes.

"Lynn," he said, smiling. "I don't know how you can even begin to think that! Honest to God, you're perfection in my eyes. Everything about you is perfect." He ruffled her hair. "Your hair, your body, your eyes…" Lincoln smiled.

A look of glamour filled Lynn's eyes. "...Really?"

Lincoln nodded. "Of course! I mean it".

A smile slowly crept across Lynn's face. She threw herself at Lincoln, locking her arms around him.

"I love you… so… much."

Lincoln returned the warm hug.

Eventually, Lynn unwrapped her arms from Lincoln, and scooted back on the bed.

"Are… are you ready, Lincoln?".

Lincoln nodded. "Whenever you are."

With that, Lynn gave one last smile before laying down on her back, and spreading her legs apart.

It was now or never.

Lincoln, hard as a rock from their earlier makeout session, slowly slid his cock inside of Lynn. The athlete grabbed his bed sheets tightly in her hands and offered a soft moan as her brother started to fill her up. Lincoln went slow at first, but as he got more comfortable, his speed gradually started to increase. His thrusts were quick and powerful. As he went faster, Lynn began to moan louder and louder. Eventually, she grabbed a sock off of Lincoln's bed, and bit down on it in hopes of muffling herself.

Lincoln was in heaven; there was no other way to describe it. Lynn's insides felt amazing around his penis, and, boy, she was tight. He pounded his sister's hot, wet cunt with bliss.

Lynn wore a grin throughout the entire experience. Her breasts jiggled up and down with each thrust. Her ponytail flew back in forth in the air, too, due to the sheer speed that Lincoln was fucking her at. She looked him in the eye, egging him on.

"Is that all you got? Is that all you got? Is that all— ohh!". Lynn once again moaned out loud.

Lincoln slowed down his thrusts, and eventually took his cock out. He wanted to try something new.

"Turn around", he said, lust evident in his voice.

Lynn obeyed. She turned herself around on the bed so that she was facing away from Lincoln, and got on all fours. The athlete once again gripped Lincoln's sheets with her hands.

"Put it in my ass, Lincoln!"

The white-haired boy did as he was told. At first, he had trouble fitting his cock into Lynn's ass. It was uncannily tight. With the wetness on his dick helping him, however, Lincoln managed to get it in before long. It hugged his cock with almost unreal tightness. Sliding it in became easier and easier as he went in and out.

"F-F-Fuck, Lincoln!", she squealed with glee. In the heat of the moment, the athlete made a request. "Spank me, Lincoln!".

Weird, thought the boy, wondering why Lynn would want such a thing. Still, there was nothing not weird about what he was doing. It wouldn't hurt to give it a try.

As he continued to fuck his sister from behind, he started to spank her. Lincoln did it lightly at first, but as he continued, the boy hit harder and harder. In response, Lynn yelps grew in volume. Whenever he slapped his sister's ass, he felt it tighten around his dick. Loving the sensation, Lincoln continued to strike Lynn.

All too quickly, in Lincoln's opinion, he felt an orgasm coming on. He was drawing to a close and warned Lynn.

"Fuck! Lynn… I'm… I'm gonna cum!"

And cum he did. Lincoln ejaculated hot, white semen, all of which filled up Lynn's ass.

The boy pulled out and started to pant heavily. This was a workout. He watched as his semen slowly started to gush out of Lynn's ass, and frowned thinking about how much he would have to clean up after this.

"That… that was amazing, Lynn," Lincoln said with delight. A smile grew on his face. "Now, let me return the favor."

Lincoln grabbed Lynn, and flipped her back over so that she was facing upward. Her legs will still hanging off of the side of the bed. He gently spread apart her legs.

The white-haired boy got down on his knees so that he was eye-level with Lynn's cunt. Getting a closer look, the boy noticed just how perfect it was. It was soft and hairless, and although it was the first one Lincoln saw, he thought that Lynn's vagina was perfect.

The boy dropped to his knees and licked Lynn's slit playfully. She giggled with excitement. Lincoln licked it again, moving his tongue around. Eventually, he put his tongue inside of it, and started to go to town.

Lincoln went deeper and deeper and deeper, earning a moan with each lick, eventually going as far as to reach the walls of Lynn's pussy. He moved his tongue around gracefully, much to Lynn's satisfaction, and this was reflected in her ever increasing output of moans. She gripped the bed sheets tighter and tighter, doing her best to control herself. Her legs began to shake; she was in love with Lincoln's abilities.

If it was up to Lynn, she would stay like this all night— lying down on her brother's bed while he ate her out. Of course, the reality of the situation was that nothing this good lasted nearly as long as it should. Lynn felt an orgasm coming on, and did all in her power not to scream out in exhilaration.

"Shit!", she cried out of pleasure.

In the next few seconds, Lynn went into a trance. She felt like every muscle in her body tighten up and her thighs start to quiver. Waves of pleasure pulsed throughout her body. She felt light-headed, and the athlete lt tingles rush throughout herself. This was pure and primal, which was made even more so conspicuous as Lynn reached out and gripped Lincoln's free hand. Her brother squeezed her hand back, his way of letting her know that everything was okay.

Lynn didn't know how long it had lasted. All she knew was that it was the best fucking thing that had ever happened to her in her life.

When all was said and done, Lincoln stood up from the ground and threw himself on Lynn, grabbing her in a tight embrace. She hugged him back. The two said nothing, for nothing needed to be said. Lynn and Lincoln layed there for what seemed like hours, until eventually, Lincoln fell asleep. Lynn gave him a kiss on the cheek, stood up, and opened the door. She looked out at the still empty hallway.

Before leaving, the athlete went back to Lincoln one more time, and gave him another kiss, this time on the lips. Even in his sleep, Lincoln smiled at this.

This was the start of something wonderful.

This was the first time I wrote anything about loudcest, and moreover, this is my first M rated chapter. I have a general idea of where I want this story to go. There's going to be some sort of plot going on, but more importantly, the fanfiction will be chock full of steamy sex scenes.

For those wondering, I don't just plan on writing just Lincoln and Lynn scenes. in fact, I may even entertain the idea of interdimensional travel later on. This chapter was really just me dipping my toes in the water, and starting off with standard stuff to test the temperature.

Of course, if everybody hates this story, I'll just go back to my old projects. Honestly, I have no idea how well this is going to be received. It's my first time doing anything of this nature, and I know many people hate loudcest with a burning passion.