*NCIS HQ*
Tim and Tony were sitting in their chairs, fighting over which Fast and Furious movie was the best.
„It's 6th one. Cars are amazing in that one."- Tim said slightly anoyed
„No Probie, 7th one. That fight scene is great."- Tony was talking in his "IKnowEverything" voice and that pissed McGee off.
They kept on fighting and didn't notice Gibbs, Vance and a random girl standing next to them. Gibbs cleared his throath. They stopped and looked towards them.
„Gentelmen, meet Katarina Zec-David. She is here because of Ziva David."- Vance said and Tim and Tony looked confused.
„We'll leave you to get to know each other."- Gibbs said and him and Vance left.
„As you already know, I am Katarina Zec-David. I'm here because I need your help…"- Katarina said. As she started speaking Tony got back to reality.
„Woah wait! Did you say that your last name is David?!"- Tony asked, trying to figure everything out.
„Yes. But I am not Ziva's biological sister. 15 years ago, MOSSAD was in Croatia. There was a war in Croatia at the time. My real parents were killed and Ziva found me in a destroyed house. I was afraid that she would kill me, but she took me with her and saved my life. I was raised as a assassin in MOSSAD. Ziva is my sister and she is the reason I'm here."- Katarina explained and everything was clear to Tony and Tim. They were comfused because Ziva said that her sister and Ari were killed.
„Explain that part about you needing our help"- Tim finally spoke after he was done analising her. She looked a lot like Ziva, even knowing that two of them had no blood connections. She had dark brown, wavy hair, dark eyes, dark skin and soft accent. Her accent wasn't like Ziva's. Katarina had a mix of accents. She had a israelian and croatian accent.
„I'm here because I'm worried about Ziva. I know that she was in Israel and everything, but she hasn't contacted me in 2 months. She always talks to me at least every 2 weeks. I think that she is in trouble."- Katarina said and Tony's face lost it's colour.
„Y…You think that she might be dead?"- he bearly said it, hoping that Ziva is ok.
„What?! No! Ziva will never die. She is a survivor. I think that she is kiddnaped or something."- Tony got a flashback form when they went to Somalia.
„I need you to come to Israel and help me find her. Don't think that I can't do it myself. It's just that I don't want to risk geting caught."- Katarina explained.
„I'm in!"- both Tony and Tim said in same time.
„Great! Pack your bags. We are leaving in 5 hours."- Gibbs walked next to them. They sat there, looking at him.
„What are you waiting for? Go home and pack your bags!"- he looked up and they jumped from their seats and ran towards elevator.

So, that's 1st chapter of my 1st NCIS story. OC is based on me. If you like it, tell me. And if you don't... tell me anyway. P.S. sorry if I wrote something wrong. I am really Croatian and english is not my 1st language.