Disclaimer: I do not own Karate Kid or any of it's characters. The only thing I own is my OC, Jessie.

AN: So I've been obsessing over Karate Kid for the past couple days now. Mostly because of Cobra Kai. That show is awesome, and the movies are amazing! And this idea just came to me and my muse wouldn't leave me alone till I wrote it out.

AN2: I'm using AnnaLyne McCord as my face claim for my OC Jessie.

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The difference a sister can make

Chapter One: Two similar but different universes

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Sometimes one person can make all the difference in a situation. Sometimes the presence of one person can change the whole outcome of a story.

In one universe Johnny Lawrence is born as an only child. And we all know how things ended in that universe between Johnny Lawrence and Daniel LaRusso.

But in another universe Johnny is born a twin. His sister, Jessie Nicole Lawrence, was born on August 20th, 1967 at 11:45Pm, an hour and a half after Johnny was born.

And in both universes, the Johnny and Jessie's father wasn't in the picture. He bailed the second Laura told him she was pregnant. In both universes, when the kids where four Laura married a rich man, Sid Weinberg, so that her kids could have a better life. And in both universes Sid was a complete abusive bastard to his wife and step kids.

The difference between the two universe, is that in one, Johnny was alone, and in another he had his sister to help him. In one universe he dealt with Sid's abuse alone. In the other his sister took the abuse alongside him, and she always made sure that Johnny knew he wasn't worthless like their stepfather said he was. Jessie took as much abuse from Sid as Johnny did, but she knew she was smart, and she knew her worth. She also knew that Sid was an asshole and that he was just trying to fuck with their heads.

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In one universe at the age of six, Ali took Ballet and met two girls named Susan and Barbara, and the three became friends. But in another universe Jessie convinced her mom to let her take ballet. And on her first lesson she met Ali Mills, Susan and Barbara, and the four quickly became friends. They'd hang out together at Ali's place or at the beach. But never at Jessie's. She didn't want her new best friends to meet her step-father. She knew if she brought her friends back home that Sid would drive them away.

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In the first universe at the age of twelve Johnny joined Cobra Kai to learn karate. He made friends at the Dojo, and he let it take over his life completely. He ignored everything else but karate, and even let his grade slip at school. He didn't have anyone there to get him back on track school wise.

But in the second universe when he joined Cobra Kai Jessie tried to join up as well, wanting to learn how to defend herself. Only to be shut down by the sensei of the dojo, who refused to teach a girl. At first Johnny wasn't going to take karate, not if his sister wasn't allowed to. But she convinced him to take it without her, even though she didn't care much for the sensei. She knew that karate fascinated him, and that it could be a good thing for him to help improve his self-esteem and help him make friends. Besides, she had ballet, and she reasoned with him that he could always teach her the moves he learned from the Dojo at home.

So Johnny started learning karate from Sensei Kreese. And just like in the other universe, within weeks of starting at the Dojo he started to change. Before going, he was quiet and sweet. Focused on school and spending time with his younger twin. But after, he became loud and brash, and started hanging out more with the kids from the Dojo than with his sister. And he started to ignore school all together.

But after he brought home his first F, Jessie smacked him upside the head for being an idiot and convinced their mom that if he couldn't keep up with his schoolwork then he shouldn't be allowed to do Karate. At first he was mad with his sister for it. But Jessie refused to let her brother's life be taken over completely by Karate and Sensei Kreese. She was going to make sure that he did well in school and could get into a good college.

So she studied with him for hours, helping him get his grades back up to what they'd been. Once he was back to getting A's he was allowed to go back to Cobra Kai, with the stipulation that he kept his grades up in order to keep going. And he eventually realized that his sister was just looking out for him.

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In one universe Johnny met Ali at the movies in their sophomore year, and soon after the two started dating. But in the other, Johnny met Ali when he was forced to attend one of his sisters ballet recitals. He first saw Ali up on stage and was fascinated by the way she moved and danced across the stage. For the next couple weeks he badgered Jessie until she finally introduced her brother to Ali. And soon afterward the two started dating.

Jessie had mixed feelings about her best friend and brother dating. She was worried that it would be awkward between the three of them. But it wasn't, and she'd never seen her brother happier than when he was dating Ali.

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Two years passed, and everything seemed to be going well. In both universe's Johnny and Ali had a seemingly perfect relationship. Until the night of Ali's birthday.

In the universe without Jessie, Ali planned her party with her two best friends Susan and Barbara. She repeatedly mentioned the party to Johnny, but he still wound up forgetting about it and instead got drunk with his friends. Ali got mad with him for missing the party and immediately broke up with him.

In the other universe Jessie helped her best friends set up Ali's birthday party. The two girls talked nonstop about the party, and Jessie constantly reminded Johnny about the party. But the night of the party came, and Johnny never showed.

The next day the two girls found out that he'd gone out with his friends and gotten drunk and had forgotten about the party, just like in the other universe. And while Ali and Jessie were both upset, they we're willing to let it go. Mostly because Jessie knew that he could be forgetful about things that weren't karate, and Jessie told Ali this. But then they found out from Susan, that her older sister saw Johnny hanging out with another girl the night before while he was drunk. That girl was Amber Jones, someone that both Jessie and Ali could not stand.

Amber was a total bitch to both girls ever since Ali started dating Johnny. Amber had had a crush on Johnny for years, but he never took notice of her. She'd tried to get close to Jessie in order to get close to Johnny. But when Jessie found out that that was why she wanted to be friends she stopped hanging out with her. And Amber had spent a lot of time picking on Ali and Jessie. Hell Jessie had even been suspended from school for a week because her and Amber had gotten into a fight one day. And both Ali and Jessie had complained about Amber to Johnny on dozens of occasions.

So it pissed both girls off to no end to find out that their brother/boyfriend was hanging out with Amber when he should have been at Ali's birthday party. It pissed them off even more that Johnny wasn't the one to tell them that he was hanging out with her, and instead heard it from someone else. Ali ended the relationship right then and there and told Jessie that they were never getting back together.

Jessie was furious at her brother for treating her best friend the way he did, constantly forgetting important events, and for hanging out with a girl who picked on both herself and Ali like Amber did. She refused to talk to him for weeks afterward, annoyed by the fact that he let Karate consume his life so much that he didn't pay attention to anything else in his life. He knew that Amber had given her a black eye and had been the reason that she got suspended from school. But just like everything else that wasn't karate, it went in one ear and out the other.

She knew that Johnny looked up to his sensei like a father. She got it she really did. Their father left before they were even born, and Sid was a bastard. And then there was Kreese, who'd taught him how to defend himself and helped make him confident in himself. But Johnny was so busy trying to make his sensei proud of him, that he stopped caring about everything else.

And if it wasn't for her badgering him to keep up with his schoolwork he would have failed most of his classes over the past couple years. And Kreese didn't seem to care that Johnny was going to fail because he was to focused on Karate. She liked that Johnny was confident in himself now, but sometimes she missed the boy he used to be before he found Cobra Kai.

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On the last night of summer, in one universe, Ali went to a beach party with her friends Susan and Barbara and met a new kid who had just moved to Reseda, California from Newark, New Jersey. And again we all know how that one ended.

But in the other universe, both Ali and Jessie went to that party. Both girls met Daniel LaRusso. And Jessie's presence would change how things eventually ended…

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AN: This is just an introduction to the story! And I'm not really sure how I feel about it. I like it, but then again at the same time I don't. And I must have rewritten it a dozen times. And this is the best version of it. So, review and let me know what ya'll think. Next chapter starts off at the beach party but I'm not sure if I'm going to do it in Jessie's POV or in third person POV. I'm leaning more towards Jessie's POV though.

AN2: I know the whole thing with the 'in this universe' got a little repetitive. But it was done on purpose to show how the two universes {the original and the one with Jessie in it} were different even before the beginning of the movie.