Author's note: There are a couple of things in here that I should have put in the first chapter, sorry. I need to do a proper outline next time.

Also, I'm writing this on my lunch breaks at work, so I have to use my phone. So if the formatting/verticle spacing doesn't seem right, that's probably because thing look different on a little phone screen. (Also, I don't see the need for double vertical spacing.) And sorry if I missed any errors while proof reading, I don't get much sleep. x.x

Anyway, enjoy.

After a couple of hours, Leni had to leave the party to go to work, and not too long after that, Sully, Mazzy and Chunk had to head out as well. Luan stayed in the pool, having it all to her self as Lynn went to her room to lift some weights, and Sam took Luna to her and Luan's room for some birthday sex. This meant Lincoln had the living room all to himself, which was a very rare occasion in the Loud house.

When Luan got bored of the pool, she got out and dried off before heading inside. She went through the kitchen to the bottom of the stairs and stopped when she saw her brother laying on the couch reading a comic book in nothing but his underwear. Her eyes couldn't help but drink in the sight of his slender, near-naked body. He didn't have much body hair, mostly just a strip going from uner hus navel down into his briefs, which contained a bulge that had not gone unnoticed by Luan.
As attractive as Lincoln was, Luan had never thought he would be feel the same way about one of his sisters. But that was before she caught him balls-deep in Lynn, so, What the hell? Luan thought. Catching him and Lynn in bed gave Luan some leverage so she didn't have to worry about him telling anyone if she came on to him. So she approached him, asking, "Mind if I join you?"
Lincoln looked up at her and said, "Sure." before turning so that he was sitting upright and not taking up the whole couch.
She sat sown right next to him and thought of what to do next. After a moment, she decided to not waste any time and just be direct. If he was offended by her making a move on him it wouldn't really be more awkward than catching him with Lynn. She laid her head on his shoulder and asked, "So you and Lynn had a lot of fun earlier, huh?"
Lincoln was a bit surprised by her leaning on him but only replied with, "Mhm."
Luan took a breath before continuing, "Judging by the sounds she made, you must be really good."
"Well, I play a lot more video games than her." he replied without taking his eyes off of his comic.
She then put her lips up to his ear and whispered, "You and I both know that the two of you weren't playing video games."
Lincoln looked up from his comic book, suddenly feeling butterflies in his stomach.
With her lips still against his ear, Luan put her hand on her brother's chest and rubbed it gently. "I haven't told anyone what you you were actually doing," she whispered gently, sending chills down his spine, "And I'll be a lot more inclined to keep it that way if you do for me what you did for her." She moved her hand down to his stomach, savoring the feel of his smooth skin.
Lincoln was speechless. He was quute embarrassed that someone knew him and Lynn had sex, but also rather intrigued that Luan wanted him in the same way.
Luan moved her hand to his crotch and started groping the bulge in his briefs, which was now getting hard. "So what do you say?" She whispered.
Lincoln dropped his comic book to the floor and answered, "Fucking hell, yes."
Luan smiled before she started tounging his ear, which made him shudder with pleasure. She then reached inside her brother's underwear, but before she could start gropping his junk, he lifted his rear off the couch and quickly slid his briefs off.
Luan smiled and bit her lip at the sight of his hard, seven inch penis before leaning down and taking it in her mouth.
Lincoln let out a pleasured sigh as his sister started flicking her tongue all over the head of his cock. He untied and removed both parts of her bikini, leaving the two of them completely naked in the living room.
As Luan started bobbing her head on his cock, Lincoln started groping one of her breasts. He was quite happy to get to touch them because, despite the fact that they belonged to his sister, they were much larger than Stella's. But there was still more of Luan's body to explore.
So after a minute of groping her breast, he pulled her thighs open so he could slip his fingers into her pussy, which was already getting wet. As he slowly slid his fingers in and out of her, then two of them began leaking precum. She moaned softly at his touch as she fondled his balls.
Finally, she couldn't wait any longer to have his cock inside of her, so she got up, straddled his lap, and lowered herself onto his penis.
She smiled at him briefly before leaning in and kissing him deeply. He put his hands on her ass and kissed back, sliding his tongue into her mouth. She stared grinding on his cock as she rubbed her tongue against his. She let out another moan as he groped her ass, her pussy getting frothy as she rode him.
As Luan picked up speed, she broke the kiss and let out a gasp. Lincoln grabbed her boobs started sucking on her nipples. The sensation of his tongue on her nipples took the pleasure to new heights and she started breathing heavily.
After a few minutes of this, Lincoln buried his face between his sisters big, soft boobs and put his bands on her back to pull her in even closer. She giggled and put her hands on the back of his head and held him tightly.
She briefly opened her eyes and in her peripheral vision she saw something that made her freeze: Luna standing at the bottom of the stairs. Wearing just a t-shirt and panites, she stared in disbelief at what her siblings were doing.
Noticing that Luan had stopped, Lincoln thrusted into her. Not wanting him to know they had been caught, she started riding him again, red in the face and still looking at Luna.
While Luna went to the back yard to grab a beer, Luan told Lincoln that they better go to the basement so no one would see them. He wasn't happy about the interruption, but agreed, so they grabbed their clothes and headed downstairs.

Neither of them wanted to lay on the cold, hard floor, so Luan put her hands against a wall and Lincoln penitrated her from behind.
As he began thrusting, he reached around and cupped his sister's breasts.
The basement filled with the sounds of their moaning and gasping, as well as the sound of Luan's cheeks being clapped.
At this point it didn't matter to Luan that Luna had caught them, this felt so good that it would be worth being judged by her sister, assuming she didn't tell anyone. Plus, it was Luna's idea to put Lincoln in a bikini earlier, and seeing what she did of his ass really got her going
Finally the two of them cried out as they orgasmed and their fluids mixed together.
Lincoln slowed to a stop and pulled out, then the two of them put what little clothing they had with them back on. Then they both left the basement and Lincoln went back to his comic book.
Luan went upstairs and knocked on the door to her and Luna's bedroom, knowing that Luna and Sam were inside. "Is it alright if I grab some clothes real quick?" She asked.
As she waited for a reply, Luan took a deep breath, not knowing what to say to her sister after what she had been caught doing.
After a moment, the door was opened by Luna. She and Luan silently stared at each other for a couple of seconds before Luna stepped aside and let her sister in. Luan saw Sam's clothes on the floor and Sam herself under the covers on the top bunk of the bed.
"Sorry to interrupt." Luan said as she went over to her dresser.
"No worries." Sam replied as Luna closed and locked the door.
"So," Luna crossed her arms, "you're really that into Lincoln?"
Luan froze, she wasn't sure if Luna was going to say anything about what she saw, but she didn't think that if she did, it would be in front of Sam.
"Are you into other chicks, too?" Luna asked.
Wanting to avoid eye contact, Luan remained focused on getting clothes from her dresser. "C-can we talk about this later?" she asked.
"I mean, if you're into your brother," said Luna, "it wouldn't be any worse if you were to mess around with one of your sisters."
Luan turned around and gave a confused look to Luna, which Sam chuckled at.
"I'm not here to judge, dude." Luna explained, "I'm asking if you want to be me and Sam's third."
Luan dropped the clothes she was holding out of surprise. "...Really?" she asked.
"You've talked about being bi-curious, haven't you?" Sam asked.
Luan blushed, "So you're not upset about..."
"What you did with Lincoln?" Luna smiled as she came closer, "Pfft, I can't knock it 'till I try it."
Luan couldn't believe her ears, "...So you want me to do it with you, too?"
"Only if you want to." Said Sam, "We're not going to tell anyone what you did with Lincoln either way."
"Ok," Luan smiled sheepishly, "um, sure."
Luna smiled and took off her shirt, revealing her C cup breasts which both had industrial piercings on the nipples.
Sam got down from the top bunk, revealing her naked body and her breasts that were slightly bigger than Luna's but smaller than Leni's.
Luan looked over at Mr. Coconuts, who was sitting on her bed and said, "Looks like you're getting a show, Mr. Coconuts."
Luna smiled and rolled her eyes and removed Luan's bikini. Her and Sam each groped one of Luan's breasts for a moment before leaning in to suck on them. Luan gasped at the sensation of both of her nipples being licked and once. Luna and Sam could feel Luan's nipples get hard in their mouths.
Luan caressed the other girls' backs with her hands, while Luna reached down and slipped two of her fingers into Luan's pussy. Sam grabbed the two sisters' asses and started groping them.
Luna then moved her face up to Luan's and kissed her on the lips for a few seconds before pulled back and asking, "Hey Sam, wanna make this a three-way kiss?"
Sam pulled her mouth away from Luan's breast and replied, "Sure." with a smile before leaning in.
The three of them started making out, and at this point, Luan's pussy was dripping wet. As their lips and tongues intertwined, Sam's pussy got wet as well. Once Luna was dripping from between her legs, she pulled her panties off and left the other two to keep making out while she got something from the closet.
As Sam and Luan wrapped their arms around each other, they heard Luna say, "Are you ladies ready to ride me like a motorcycle?" They turned and saw Luna wearing a nine inch strap-on. She proceeded to lay down on the floor and motioned to Luan, "Come sit on mommy's face."
Luan did as she was told and sat facing Sam, who mounted the strap-on.
As Sam started riding her girlfriend's fake dick, Luna put her hands on the sides of her sister's ass and started eating her pussy.
Luan closed her eyes and tilted her head back, letting out a moan of ecstacy as she did so.
Breathing heavily, Sam reached out and started playing with Luan's tits.

After finishing his comic book, Lincoln went up to his room to get another one to read. Once there, he heard a moan come from Luna and Luan's room. Knowing that Luna had Sam over, he grinned and shut the door to his room.
He sat on his bed and put his ear up to the wall, and because it was so thin, he was able to easily make out what was happening on the other side.

After licking the entirety of Luan's cunt for a bit, Luna focused on her sister's clit, which made it very hard for Luan to sit still.
Sam smiled as she watched Luan squirm, picking up speed as she rode the strap-on.
With each passing moment, Luna's pussy got wetter, knowing that her girlfriend and her sister were experiencing so much pleasure because of her.
Sam clenched her jaw and breathed through her mouth as she hopped up and down, keeping her eyes on Luan's lovely breasts.

By now, Lincoln was rock hard. Then suddenly he had an idea. He grabbed his phone off his dresser and got back on his bed.
He started recording a video. Granted, there wasn't anything to see, but he made sure the microphone was close to the wall so he could enjoy this audio-only show again later.

"Oh my god!" Luan cried as her sister's tongue went crazy on her clit.

Lincoln's eyes went wide when he recognized Luan's voice.
Is Sam cheating on Luna with Luan? He wondered.

Finally, Luna's got her sister to orgasm, squirting right in her face as she did.

As disturbed as Lincoln was that Sam would cheat, he couldn't help but grin a little upon hearing Luan cry out in pleasure. Soon after, he heard Sam let out a yell as she had her own orgasm.
He stopped recording and sat there for a moment, thinking about what he had just overheard. He was about get up so he could get back to reading comic books, when he heard a voice say, "Are you ready to eat mommy's pussy?"
It was Luna.
Lincoln's eyes went wide and he started recording again.

Luna had taken off the strap-on and was laying on the floor her legs open wide.
As Sam dove her face into her girlfriend's pussy, Luan got on her hands and knees so that her boobs were squished onto her sister's face.
As Luna grabbed on her sister's boobs, Luan said, "Well, this definitely wasn't a bust, it's the breast idea you've ever had, Luna!"
Sam giggled, and on the other side of the wall, Lincoln facepalmed while letting out a chuckle. Fortunately, he was still quiet enough as not to alert the girls to his voyeuristic eavesdropping.

With her hands on Luna's thighs, Sam ate out her girlfriend's pussy while Luan sucked on Luna's nipples.

As Lincoln listened to the lesbian ménage à trois, Lynn suddenly came onto his room, making him jump. Lynn let out a giggle and asked, "What are you doing?"
Lincoln stopped recording on his phone as he shushed her.
"What?" Lynn asked.
"Luan's having a three-way with Luna and Sam." He whispered.
"What?!" Lynn scoffed.
Lincoln shushed her again, then motioned for her to come closer. She sat down on his bed and listened for a moment.
"Holy shit!" She whispered.
"I know, right?" He chuckled, "What kind of sicko has sex with their sister?" He winked.
"What kind of perv listens to his sisters bang?" She grinned.
He raised an eyebrow, "What kind of sister barges into her brother's room?"
"The same sister that's done acting like she doesn't enjoy seeing her brother in nothing but his underwear." She replied and looked at the bulge in his briefs.
"Did you come here for seconds?" He grinned.
She looked back in his eyes, "We should go for a swim before the rest of the family gets home, just you and me."
"Lemmie put on my trunks." He said as he got up.
Lynn also got on her feet, saying, "You don't need trunks." She proceeded to reach down and pull his briefs down to his ankles.
Lincoln blushed a little and smiled as he stepped out if his tighty-whities. Lynn grabbed her brother's dick and led him out of his room.
They got to the top of the stairs and stopped when they heard Luna yell, "Fuuuuuuck yeaaaaahh!"
They both snickered before heading downstairs and out back to the pool.
Lynn took off her clothes and dropped them on the lawn, then the two of them hopped into the pool. The water level only went up to about halfway to Lynn's chest, leaving her now hard nipples exposed, which Lincoln took notice of.
He put his hands on her chest and rubbed her nipples with his thumbs.
After a few moments he leaned in and put his mouth on one of them, sucking gently and flicking his tongue back and fourth over it. She let out a soft gasp and caressed the back of his head with one hand and reached down and groped his balls with the other.
Lincoln reached down and started groping her ass before switching to her other nipple.
"Mmm, you know how to turn a girl on, Lincoln." She purred before grabbing his cock and groping it.

Luna laid on the floor, panting. She had just gotten a second orgasm from Sam, who was now laying next to her.
"So, did you have as much fun as we did?" Luna asked her sister.
"Heck yeah!" Luan smiled as she got dressed, "We should get the rest of the family out of the house more often, we could gang up on Lincoln some time."
"He's quite the little stud, ain't he?" Luna replied.
"I'm gonna have to pass on that one." Sam said as she nuzzled against Luna.
"You know," said Luna, "between our jobs and how much ad revenue The Moon Goats has been making from YouTube, Sam and I have been making enough to start looking for an apartment together."
"Oh yeah?" Luan asked as she finished dressing and started brushing her hair.
"It would be easier to afford if we had a roommate." Said Luna.
"Sorry, but I don't want to rent an apartment just working at Dairyland," said Luan, "I need to find something that's open year round." She paused, "You know, Leni has been wanting to move out and...well, she'd be better off not being completely on her own."
Luna nodded. Despite Leni having gotten a little more mature and responsible over the years, her childish nature rendered her somewhat helpless without her family.
"We should definitely talk to her about renting a place together." Sam said to Luna.
"Yeah," Luna replied, "that way we'll only have one person to get out of the house when we wanna fuck."
"Having thicker walls will help too." Luan added.
"Well, as soon as she's back from work, I'll talk to her." Said Luna.
Just then, Luan got a text message. She looked at her phone and saw that it was from her mother. "Mom says they're on their way home." Luan told the others.
"We better get rid of the beer." Luna said, before getting up. Her and Sam got dressed, then headed downstairs. Luan wanted to have some more chips, so she followed behind. As soon as they went through the door to the yard they froze.
Lincoln was buck naked, leaning back against the outside of the pool with Lynn on her knees, naked, sucking his cock. She had one hand on the base of his penis and the other rubbing his hip.
Luna's jaw dropped, Sam blushed, and Luan bit her lip.
When Lincoln noticed the three of them his face went pale.
"Are you trying to get caught, bro?" Luna asked.
As soon as she heard her sister, Lynn pulled her face away from her brother's crotch and whipped her head around. Not knowing what to say, Lynn looked at the others like deer in headlights.
Luna shook her head, "I mean, it was one thing doing Luan in the living room, but-"
Lynn, whipped her head towards Lincoln, "You fucked Luan?!"
"You saw me and Luan doing it in the living room?" Lincoln asked Luna.
"I better go." Sam said nefore grabbing the case of beer and kissing Luna on the lips. "See ya, babe." Luna said before Sam headed into the house, out the front and to her car.
"So, how many of your sisters have you fucked, Stinkon." Lynn said and gave him a friendly punch in the gut.
"Just you and Luan." He answered.
"So far." Luna said and gave him a grin.
"You mean you wanna bang him too?" Asked Luan.
"You lucky son of a bitch." Lynn chuckled.
"I take it you two weren't playing Guitar Hero earlier, huh?" Asked Luna.
"Do you really think I'd let him beat me again?" Scoffed Lynn.
"Well, the rest of the family is on their way home," said Luan, "you don't want mom and dad catching you with your pants down."
"They wouldn't enjoy it as much as us." Luna winked.
Lynn stood up. "Let's finish this in your room." She said before grabbing her clothes off the ground. As Lincoln walked past her, Luna smacked him on the ass.
Once in Lincoln's room, Lynn dropped her clothes on the floor as Lincoln closed and locked the door behind them. Then, she wrapped her arms around him and asked, "So, did you fuck Luan because she's got a bigger chest than I do?"
"I didn't say that." He replied as he wrapped hks arms around her.
"Well, she's got the biggest boobs in the family."
Lincoln paused for a moment before speaking, "Well, you've got a tighter ass than her." He then moved his hands down to her ass and gave it a good squeeze before giving his sister a kiss on the lips.
"And you've got a nice six-pack." He said as he got down on his knees and kissed each of her abs.
"I love...all my sisters...equally..." he said as he kissed his way down her stomach, and past her patch of pubic hair until her got to her cunt.
As he started licking, she put her hands on his head and shuddered at the sensation of his tongue on her lips.
As he slid his tongue up and down his sister's pussy, he reached around and groped her ass.
Lynn looked down at him and sais, "Mmmf, I want...your cock."
Lincoln looked up at her and made eye contact as he ate her pussy. Then, he pulled his mouth away and said, "Let's sixty-nine, then."
Lincoln laid down on his bed and Lynn laid down on top of him, with her dripping pussy in his face. He put both hands on his sister's ass and resumed licking her pussy.
Lynn used her left hand to caress her brother's balls and grabbed his cock with her right. Then, she put his cock in her mouth and started moving her head up and down on it.
Lincoln let out a moan as he savored both the feeling of being inside her mouth, and the taste of her pussy.
Lynn stroked his cock in sync with the movement of her head as he leaked precum into her mouth.
As they continued, Lynn found that the pleasure she was receiving made it increasingly hard to concentrate on sucking his cock. Lincoln had to hold on to her ass tightly as she squirmed around on top of him.
Finally, the pleasure was too great, and she took his cock out of her mouth so she could grit her teeth as she orgasmed onto her brother's face. She managed to keep from yelling this time, but still let out a moanish growl.
Once her orgasm subsided, Lynn gave Lincoln's cock a kiss before getting up and mounting it crab-walk style.
Lincoln grabbed her hips and held on as she started hopping on his cock. He then closed his eyes and began breathing through his mouth as he enjoyed Lynn's walls sliding up and down his shaft. Having already gotten off twice that day, Lincoln had some extra stamina, so eventually Lynn was able to have a second orgasm, letting out another growl as she did so.
The arousal from feeling Lynn walls clamp down on him and knowing how much pleasure she was getting from him was what brought him the rest of the way to orgasm. "FUUUUUCK!" he growled as he pumped his cum into his sister.
After a few moments, Lynn stopped hopping on him, but Lincoln wasnt quite ready to stop. He took control and started thrusting into her, getting the last few drops of cum out of his dick. Once he did, he stopped thrusting and she laid down on her back on top of him.
As the two of them laid there, breathing heavily, Lincoln wrapped his arms around Lynn and said, "That was awesome." before kissing her on the neck.
She smiled and said, "Maybe you should be my roomate instead of Lucy."
Lincoln chuckled and thought for a moment. "You know, if one of us had our own apartment," he said, "we would have more privacy for this kind of thing."
"Yeah, but when school starts again," Lynn replied, "I'm going back to the dorms. Maybe you could get a place with Luna and Sam. I'm sure Flip's not paying you anything more than minimum wage, but it sounds like Luna's into you, so maybe you two could work something out. As long as you let me come visit."
"I actually got a job at Safeway that I start next week," Lincoln explained, "so I probably could afford a place if I had a roommate." He chuckled, "I bet Luan would be down to be my roommate."
"You incesting little shit." Lynn grinned.
Lincoln kissed her on the neck again and said, "We should get dressed before everyone gets home."