Lincoln was walking around the mall looking for something for his older sister eighteenth birthday, but he was having trouble not only with looking for a gift but for something else, something that is bothering him since last night.

-Said night-

Lincoln was in the bathroom reading comics, Leni and Lola took over his room. Something about needing the walls for images or some crap, so he was forced to hang out in here, but he didn't mind the bathroom, it was actually the quietest place in the house, except when Lynn is in here.

"Man I should've started reading comics in here a long time ago." He said to himself, but it was soon disturbed when he heard the door open and closed he covered his mouth as he looked out the curtain and saw Lori.

'Oh great, why is she here?' He thought as he kept looking, Lori then sighs as she starts undressing, Lincoln then blushed as she slowly took off her clothes, till she was nothing but skivvies. She then went the mirror and grabbed her breasts before she started bouncing them in her hand.

"Are these things getting bigger, man this is going to be killer on my back soon and I'll need to buy a much bigger bra soon." She said as she reached behind her back and unhooked her bra she sighs in relief, Lincoln's face couldn't be any redder. Lori then grabbed her nipple and moans a bit.

"Man, I'm really sensitive," She moans.

'This is wrong. This is wrong. I shouldn't be watching this, but this is making me feel funny.' he thought as his pants got tighter, Lori then moves to the toilet and sits down.

"I wonder if Bobby would love to make this body his?" She asked as she grabbed her right breast and moved her hand down her stomach and into her panties and started rubbing her slit, she then lifted her breast and started licking on it, Lincoln was just watching as he did his noticed his bulge in his pants, he then, without knowing, and pulled out his dick and started rubbing it as his eyes never left her. Lori moans were getting erratic signaling that she was reaching her limit.

"Oh god!" She moaned as she cummed, Lincoln then bit his lip and shot his cum onto the bathtub wall, Lori then starts getting dressed and left the bathroom allowing Lincoln to relax and look at the mess he made.

"Man good thing she didn't see me, that would have been awkward," Lincoln said as he got out of the tub and out the room, unknown to him, Lori was in her room behind the door with a smirk.

-Minutes Later-

"...And Many More!" The Louds sang as Lori blew out the candles. "Happy Birthday Lori." They said.

"Thanks, guys this was…"

"Yeah Yeah, let's eat this cake already!" Lola interjected. Lori allowed it and everyone, thanks to Lisa, got an even slice and enjoyed it but for Lincoln he couldn't help but stare at Lori as she enjoyed her cake, it was their dad's famous chocolate cake, but Lori seemed to enjoyed it a little too much as she was eating it, she carefully ate it making she sure that she cleaned that fork she then slowly pulled it out of her mouth and hummed in delight, she then looked at Lincoln and he looked away.

'Did she see me look at her?' Lincoln thought. 'Maybe I'm overthinking things.' He said as he stabbed his fork into nothing, he looked down and saw that his cake was gone, he then looked around and saw Lola eating his cake, he was about to blow up till Lori placed a hand on his shoulder.

"Don't worry Lincoln, I saved you a piece but will have to eat it later, okay?" She added.

"T-thanks Lori." He said.

"Anything for you Linky," Lori said as she kissed his forehead.

-Later that Night-

Lincoln was in bed waiting for Lori since she promised him a slice of cake.

"Where is she? I really want that slice of cake." He said, just then he saw his door opening, he looked up and saw Lori wearing a bathrobe.

"Hey Lincoln, sorry to keep you waiting, are you ready for your cake?" She asked.

"Am I ever." He said, Lori then removed coverage and lets it drop to the floor, Lincoln was blushing at the sight of his sister bare naked body in front of him.

"L-lori what are you doing?" He asked

"I'm giving you, your cake." She said as she then opened the door and grabbed a bottle of chocolate syrup and popped it oven she then turned around and poured the contents on her ass, after a good amount was poured she puts the bottle down.

"Okay, Lincoln dig in

" Lori said as she bends over and gave a little shake.

"But, but this is wrong, we shouldn't be doing this," Lincoln said.

"Oh come on it still my birthday, plus I saw you staring at me at dinner and I know you were in the bathroom." She as she faced him she then got down on her knees. "And I gotta say you have my interest." She said as she grabbed her brother's underwear and pulls them down till they hanged on his ankle.

"Still a little nervous don't worry, you'll like it." She said as she grabbed his flaccid dick and started pumping at a nice slow pace.

"L-Lori that feels good." He said.

"I'm glad that you feel good, but you have to help me with this mess on me." She said

"O-okay," Lincoln said as he reached out and grabbed her chocolaty sticky buns. He proceeds to stick his tongue out and started licking he licked in the small area around her glutes trying to ignore the puckering hole, but Lori made sure that he got every inch.

"Now Lincoln don't be scared." She said as she forced his face deeper. "This hole needs love too, don't worry its clean." She said, Lincoln then starts licking that puckered exit, Lori moaned.

'Man this taste weird but it's oddly enjoyable.' He thought the taste of her salty skin and the sweet chocolate made him lose all train of thought, Lori soon stopped him, his tongue with saliva and a dazed look on his face.

"You can stop now you got all the chocolate off." She said with a smile.

"Sorry I guess I got into it." He said

"No that's okay, did you like the "cake"?" She asked

"Yeah, it was delicious," he said

"Good, now time for my dessert." She said as she pushes Lincoln onto the bed and smiles, she then pulls down his pants and then his undies as she did, his little Linky popped out.

"Lori what are you...Ohhh!" Lincoln couldn't finish his sentences, Lori took the tip into her mouth and only the tip. Lincoln moans were high-pitched and loud, Lori smiled as she lets go and started pumping, she places a finger on his lips.

"You have to stay quiet if you don't want this to end yet." She said.

"O-Okay." He said. Lori then smiles as she took his dick in her mouth again, this time the whole shaft. Lincoln had to bite his lip to keep this from ending, she soon began to bob her head up and down slowly at first, wrapping her tongue around her brother's shaft, her hand then reached down and gave the family jewels a squeeze, he tensed up and placed his hands on his sisters head and cummed into her mouth, making her swallow. As she pulls him out she closed her mouth and swallowed what was left.

"Sorry, I didn't mean…"

"It's okay," She interrupted. "It what I was after." She said, she then got up and pushed Lincoln on his back.

"No time for a second helping." She said. As she took his penis in hand and started rubbing it.

"Okay then, your mouth did feel good," Lincoln said, Lori then smiled.

"Who said anything about this mouth." She said as she as towers over the youngest male Loud and spreads her womanhood apart, she then lowers herself till the tip of his erected penis was touching her warm inner folds, enveloping his pubescent rod.

"Lori it feels really warm and tight." He said Lori smiled as she got into a comfortable position, rested her hands on his chest and bends down and gives him a kiss. Lori shoots in her tongue into his mouth and their younger started dancing but only for a few seconds, before Lori pulled away leaving a trail behind, Lori then lifted her hips and dropped them back down repeating the steady pace. Lincoln moans as Lori smiled. He was loving every bit of their sinful lovemaking and so was she. Lori soon flips the two over, making Lincoln lay down in between her breast.

"Your turn." She said. "Just move your hips and do what comes naturally." She said, Lincoln nodded and started to thrust his hips back and forth slow at first but gradually increasing speed.

"Oh God Linky, your literally doing awesome!" She moaned, Lincoln soon sat up and grabbed her legs and trusted harder and harder, Lori it's happening again!" Lincoln moaned as his speed increase more.

"Do it, little bro! Cum in me!" She said as, Lincoln then thrust one more time and froze as he lets out streams of cum into his sister, he then landed on her breast and started breathing hard. Lori then wrapped her arms around her brother and kisses his forehead.

"Thanks for the birthday gift, Linky." She said.

-Years Later-

Lincoln awoke from his desk, the comic he was working on still incomplete.

"Damnnit." He said as he stretched popping his joints. He then heard a loud noise coming from outside as he got up from his chair and opened the door the hall light shine at him as he looked out to see his children either playing or yelling at each other they then noticed Lincoln and stopped what ever they were doing.

"Hey, Dad!" They all announced.

"Hey everyone." He said with a tired smile, everyone then crowded around him.