Note: Some parts in this fanfic aren't in the anime. Just in case you get confused by the end of this.
Enjoy.
Eren: (gets sent to a courtroom and is locked in chains in the middle of the courtroom)
Mikasa: Eren…(looks at Kaiias)
Kaiias: He'll be fine. Just answer every question right. There's no reason to lie. It'll just confuse people and probably make things worse.
Mikasa: But, if we tell them about his attack…
The premier walks in. Everyone stands until he sits down.
Premier: (looks at his paper) All right. (looks at Eren) Eren Yeager. You are here today because the people are terrified. And I will decide, whether you are a benefit, or a handicap.
Eren: (gets scared)
Premier: (looks at Nile) Nile? What would you like to do with Yeager?
Nile: We see that Eren Yeager has benefited us in trost, however, it is said that he cannot control his ability. This is why we say that Eren Yeager should be disposed of immediately.
Pastor Nick: This being has defied our great walls! It should be disposed of now!
Premier: That's enough. (looks at Eren) Eren. I have a question for you. If you used your powers for mankind, would you be able to control it?
Eren: Y…yes sir!
Premier: Hmmm…well, this report on Trost said that after transforming, you attacked Mikasa Ackerman and Kaiias Cardyle. Kaiias had to slice your legs and blind you to get you to stop. You went inactive for almost a full hour until somehow you snapped out of it. (looks up) Are Mikasa and Kaiias here?
Kaiias: (stands up) Yes sir.
Mikasa: (stands up with Kaiias)
Premier: Is this true?
Kaiias: (looks at Mikasa and looks back at the Premier) Y…yes sir…
Eren: (looks surprised) I…I did that…?
Armin: (sees Eren's face) He…he doesn't even remember it…it's like his mind was in a different place…
Premier: Is that how your arm is broken?
Kaiias: Eren hurt it badly but I went on. Eren was the main reason…I pushed Mikasa out of the way so she would be safe.
Premier: And this report says you were able to handicap Yeager, yes?
Kaiias: (nods)
Premier: (looks at Eren) I see.
Mikasa: (interrupts him) I take it that you didn't get the part of him saving our lives. Twice.
Premier: (looks at Mikasa)
Mikasa: He saved me twice. Once when I was in trost, and twice when Kaiias, Armin, Eren, and me were almost killed by a cannon ball.
Nile: She's only saying this cause she has history!
Premier: (looks at Nile)
Nile: (looks at his paper) It says here that at the age of 9, Mikasa and Eren killed three human traffickers trying to kidnap Mikasa. (looks up) Even though it was self-defense, one can only feel the violent nature of the act. Should we really trust someone who kills?
Merchant: (points at Mikasa) Maybe she's also a Titan! Kill her too!
Eren: (looks at the merchant) Don't you dare!
Everyone goes quiet.
Eren: I should stop…no…they need to know…(yells) Maybe I'm the monster, but she isn't! I'm the one you should kill! She's completely innocent!
Kaiias: (grabs Mikasa's arm)
Mikasa: (looks at Kaiias) Wh…what are you doing…?
Kaiias: (looks at Armin) Armin, grab her other arm…
Armin: (looks confused) Why?
Kaiias: (sees Levi standing up) Gut feeling.
Armin: (looks scared a bit and grabs Mikasa's other arm)
Nile: Why would we trust you?
Eren: It's the truth! You'd know that if you weren't all spineless cowards!
Everyone looks shocked.
Nile: How dare you! She must be one if you'll protect her!
Eren: JUST SHUP UP!
The entire courtroom goes silent.
Eren: (looks up) You know nothing…you've never seen one…(looks at them) But you're so scared to witness one, that you'll let fear get in the way…
Nile: What do you mean…?
Eren: Why do you care so much…? You've never even seen a Titan! And now someone wants to actually give you hope and you just want to crush it? If you're too scared, then let me do it! I'll fight for you! So just shut up! And put all you're faith in me!
Nile: (thinks and then looks at a MP soldier) Take aim!
Soldier: (points his gun at Eren)
Levi: (walks up to Eren and kicks him in the face, knocking his tooth out)
Eren: (breathes heavily and looks up to see that it's Levi)
Levi: (kicks Eren in the stomach)
Mikasa: (looks shocked then looks angry and starts walking towards the edge)
Kaiias: (holds Mikasa back) Mikasa, don't.
Armin: (holds her back with Kaiias and looks at Kaiias confused and thinks to himself) How does he know all of this…?
Levi: (keeps kicking a bloody Eren in the face and stops) Personally, I see no better teacher than pain. You don't need to be talked to, what you need is to be taught a lesson. And the way I see it, you are in perfect kicking position. (kicks Eren in the face and steps on his head repeatedly)
Nile: (looks kinda scared) W…wait Levi.
Levi: (kicks Eren one last time and leaves his foot on his face) What is it…?
Nile: What is he gets angry…? And transforms…?
Levi: (looks at Nile) What if he does? I'll kill him, can't say the same for you guys. In his Titan form, he was able to kill 20 Titans before running out of stamina. As an enemy, his intelligence is even more dangerous. But I'll be able to take him out, no problem. (looks at Kaiias) If he can do it no problem with a hurt arm, (looks back at Eren) I know I can.
Ervin: Sir. I have a plan.
Premier: (nods)
Ervin: I say that we plan a reconnaissance mission in a month's time to have Eren test his Titan abilities.
Premier: (looks at Eren) What if he goes Rouge?
Levi: I can handle him. Trust me.
Premier: (nods) Well that settles it. Eren Yeager will be helping in the next recon mission.
The scouts take Eren to a room to help him clean up his face. Hanji, Mike, Ervin, and Levi are all in the room with him.
Hanji: Well that could've gone worse than expected. (wipes Eren's face) Does it hurt?
Eren: (holds the towel) Y…yeah…
Hanji: (looks excited) Really?! Describe it!
Ervin: I'm sorry for the Levi. (walks up to Eren) He didn't see any other way to convince them, and frankly, neither did I.
Eren: (looks up at Ervin) I…it's okay. I see why he did it.
Ervin: (smiles and hands out his hand) You have my respect Eren. Welcome to the scouts.
Eren: (shakes Ervin's hand)
Levi: (sits next to Eren)
Eren: (flinches after seeing Levi sit next to him)
Levi: So, I hope you don't hate me because of what I did.
Eren: No sir, I see why you did it…
Levi: Good.
Hanji: Don't you think you went a little too far…? I mean, you knocked his tooth out! (brings out his broken tooth) Cool huh?
Levi: Well, at least you don't have to get dissected by a nutjob like her.
Hanji: (laughs and walks up to Eren) I wouldn't dream of killing you Eren! Now, can I look inside your mouth?
Eren: Umm, sure? (opens his mouth)
Hanji: (looks surprised) Eren…your tooth…it grew back…
A few hours later, Kaiias, Mikasa, and Armin are all in Kaiias' hospital room.
Kaiias: (laughs a bit) I wish I was there when you were little kids.
Mikasa: Where did you live before you came to Shiganshina?
Kaiias: Somewhere far. I was living on my own for as long as I can remember. (remembers him watching the anime and reading the manga)
Armin: Whoa seriously?
Kaiias: (nods) Th…
Everyone looks at Kaiias.
Kaiias: That's why I trust my gut, I never had a family…
Armin: (smiles) Well, now you do.
Kaiias: (smiles back) Thanks you guys. But I don't see why you guys respect me so much.
Armin: Cause you've saved Mikasa. Twice.
Kaiias: (shrugs his shoulders) Anyone would've done it.
Mikasa: (looks away) It's my fault that you're hurt, if I had moved out the way, you wouldn't have had to save me.
Kaiias: Hey, it's nothing. I'll be fine we pick our regiment.
Armin: Oh man! I almost forgot. What regiment are you going to? I'm guessing your going to the MP's?
Kaiias: Well, actually, I'm going with the scouts. I can't let such skill go to waste for the MP's.
Levi: (walks in) That's good to hear Cardyle.
Mikasa and Armin stand up.
Mikasa: (gets and enraged look on her face)
Levi: Are you Kaiias Cardyle?
Kaiias: y…yes sir.
Levi: You said you're going to the Scouts? Cause I have an offer for you.
Kaiias: (looks surprised)
Levi: How would you like to be on the special operations squad?