A/N: I just want to thank everyone who has reviewed, followed, or favorite my story. This is my first fanfic ever and I was so surprised by the awesome response to this story. This story is probably going to be little one-shots of KJ's everyday life so if you guys have any suggestions, please feel free to let me know. Again, thanks so much for the reviews; they really mean a lot. I hope you enjoy! R&R

KJ walked into the firehouse after school, just like any other normal day. Except today, she walked in with her hoodie pulled over her head, looking down as she made her way over to Dawson and Shay who were restocking the ambo. When she got to the ambo, she pulled them both inside, quickly shutting the door before anyone could notice.

"KJ, what happened?" Dawson asked, confused as to why she was pulled into the ambo.

"Hello? KJ?" Shay said, trying to get KJ to talk to her. "Babe, what's wrong?"

KJ still wouldn't look up. Finally, Dawson reached over and pulled he hood off of KJ's head.

"Holy shit!" Shay exclaimed.

"Please, don't tell Kelly!" KJ pleaded as her black, swollen eye and split lip were now completely evident. KJ took her hands out of her pockets, only to reveal them both covered in dried blood.

"KJ, what happened?" asked Shay worriedly.

"Nothing happened," KJ replied. "It was just a little fight."

"Yeah, try telling that to Kelly," Dawson smirked, already knowing how the firefighter would react.

"Come on guys. You can't tell him or Matty! Kelly will literally go nuts! Please," she pleaded. "Don't you have some makeup that you can cover it up with?"

"Fine," Shay finally conceded. "But he's gonna find out anyway."

"No he won't," said KJ confidently.

"Whatever you say KJ," Dawson responded as she went to work trying to cover up her injuries and ease the swelling.

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After KJ finished her homework, she decided to watch the Giants-White Sox game on TV. Amazingly, she hadn't run into Kelly or her brother all day. It was a pretty busy shift and the rest of their time was spent catching up on paperwork.

After the game ended, everyone was on a call and KJ didn't know what else to do. She decided to take a quick nap before dinner. KJ went to Kelly's room and laid down on his bed, playing on her phone. Eventually, sleep took over KJ and her eyes finally closed.

Everyone at Firehouse 51 piled into the kitchen when they got back, starved from their most recent call. Casey didn't see his little sister and figured she must be taking a nap.

"Hey Severide," Casey called out. "Can you go wake KJ up for dinner? I think she might be sleeping."

"Yeah, no problem," Severide replied, happy to go wake up his favorite teenage girl.

Kelly walked into his room, noticing how peaceful KJ seemed when she slept.

He walked over to his bed and put his hand on her head gently saying, "Junior, you gotta wake up, babe. It's time for dinner."

KJ slowly rolled over, groaning from the interruption of her sleep. Kelly knelt down to get closer to her, only to see a slight discoloration of his pillow. His pillow had some light tan smears on it, but Kelly didn't know what they were from. When he looked up, what he saw enraged him.

"Junior, what the hell happened to your face?" he yelled, realizing the smudges on his pillow was her failed attempt to cover up her injuries.

"Kelly, calm down. It's not a big deal," KJ said calmly, trying to quiet down her uncle.

"Not a big deal? Are you kidding me Junior? Your eye looks like a fucking blueberry exploded on it!" Kelly screamed, wanting to know who would hurt his girl. "I swear to God I will kill whoever did this to you!"

"What the hell is going on in here?" Casey questioned as he walked into Kelly's room. He finally looked up to see KJ staring directly at him. "Oh my God, KJ!" he said running over to her, checking over her body for more harm, eventually finding her bruised hands as well.

"I'm fine, Matty. I swear," KJ said, brushing it off like it was no big deal.

"Bullshit," claimed Kelly, obviously annoyed with his niece.

"Tell me what happened, baby girl," Casey said softly, his eyes pleading with her for answers.

"I ran into a wall?" KJ suggested, trying to lighten the mood. However, when she looked to her brother and uncle, they weren't smiling at all. "Ok, ok," KJ finally said, giving into their stares. "Some seniors were giving me some shit earlier today for trying out for varsity, saying girls couldn't play baseball. I guess this guy in my class named Jake overheard them and didn't like what they were saying. So then at practice, I was catching for Jake, and one of the seniors was at bat. Jake pitched a little too inside to get back at him, and the guy went nuts. I could see that he was gonna go after Jake so I kinda took a swing at him. Then naturally, he swung back. Then the coaches broke us up, and yeah, that's my story."

KJ slowly lifted her head up, afraid of the looks she might find on the two men's faces. She was slightly confused by what she saw. The expression on her brother's face was as she expected. He looked like he was ready to murder someone. Kelly, on the other hand, had a smirk on her face.

"Junior, you beat up a dude?" Kelly asked incredulously, a sense of pride in his voice and a smile still on his face.

"Kelly," Matt said. "She can't just go around punching people in the face."

"Matt, she was sticking up for a friend. You can't be mad at her for that. She was just doing the right thing," Kelly rebutted.

Casey knew Kelly was right. "Yeah, yeah, I know. Come here, babe." Casey motioned for KJ to come stand by him. Casey lifted her chin up and brushed his thumb over her blackened eye. He brought her head into his shoulder, trying to give her some comfort. He quietly whispered into her ear, "Tell me the name of this senior, babe."

KJ looked up at her big brother with sad eyes. She knew he was being completely serious, and that if she told him, that kid would be in the morgue the next day. So instead, she smiled a sad smile, and turned to walk towards Kelly.

"Guess what, Kell?!" KJ said excitedly.

"What?"

"I made varsity!"

"No way! I knew you would Junior," Kelly laughed, picking KJ up and carrying her fireman-style out of the room, being cautious of her injuries.

Casey sighed. He was happy to know that his little sister was okay. But, it was his job to protect her and he had failed. He needed to find this kid.