Setting: Recon Corps HQ. Hanji decides to test the presence of fear within abnormal Titans.

I do not own Shingeki no Kyojin

"Alright everyone hold him down!" Hanji bellowed to the Recon Corps members who were dealing with their newly captured Abnormal Titan. "Calm down, Theodore."

"Miss Hanji!" Moblit was always concerned with the way his superior interacted with titans. "Stay away from Theodore's mouth!"

"What are you talking about Moblit? Me and Theodore are-"

Snap

"Miss Hanji!" Moblit was close to turning white from all the fear.

"Woah that was close!" Hanji laughed. "Theodore you should-"

Hanji was interrupted by Moblit who had both his swords drawn.

"Moblit!"

"I am sick and tired of these-"

Whimper

"T-the titan is expressing fear." Hanji declared. "IT'S AFRAID!"

Moblit was a mix of emotions. He was hoping to kill Theodore but now he found himself surprised. He even felt flattered since the titan's fear was a result of his behavior. Hanji on the other hand was purely elated at the thought of a supposedly emotionless titan expressing fear.

Snap

The titan tried to unleash it's teeth on Moblit, who was perilously close. The Whimpers had disappeared.

"Moblit try and see if you can get the same reaction for a second time."

After dozens of attempts to instill fear into the Titan, all of which were fruitless, Hanji decided on something else. She would have to get someone else to instill fear into the Titan.

"Please Levi. Please Please Please!" Hanji was begging Levi to instill fear into Theodore. "It'll only be a minute."

"No." Levi replied with a bored expression. "I have to accompany Erwin to Sina tomorrow. Get someone else"

"Okay Fine" Hanji had finally submitted. "Maybe I should get Mikasa."

"I have a feeling you shouldn't" Levi gave her a quick glance.

"Why not?" Hanji sounded sarcastic but she was genuinely waiting for Levi's answer. "Mikasa hates you, not me."

"It's not Mikasa I'm worried about" Levi allowed a moment of silence to pass before continuing his statement. "It's the Brat."

"What?" Hanji replied playfully. "Eren and me are best buds!"

"Remember his background as a Trainee?" Levi grabbed a folder from his desk. "Eren Jaeger. Arguably one of the Most skilled Males in the entire 104th. His determination to improve has had a dramatic effect on his skills. During a brawl, his batchmate, Reiner Braun stated that he was one of the best in terms of Hand-to-Hand combat. Eren Jaeger's first combat experience with a Titan was with none other than the Colossal Titan in one-on-one combat. Here, his anger towards the titan was a trigger. He also-"

"Blah blah blah" Hanji rudely interrupted. "I know about the emotions between the two and Eren's per-"

"You might trigger something." Levi interrupted her this time. "People have different sides to them. Dice, if you will. Something like this might trigger something inside the brat."

"ZZZZzzzz..." Hanji was fake-snoring. "Is that all? Do you always have to be the negativist?"

"Fine do what you want." Levi knew there was no dissuading Hanji on something like this.

"Thanks!" Hanji was out the door in a few minutes.

Unlike Levi, Mikasa agreed to Hanji's demands fairly quickly. All she would do was shake up Theodore a little. They started the experiment the next day. Eren was there with his usual behavior but Hanji noticed that something felt slightly odd about him.

"Alright Mikasa give it your best Shot!" Hanji cheered.

"Yes Ma'am." Mikasa replied emotionlessly. A second later, her blades were out and her death glare was affixed on Theodore.

The titan began whimpering almost immediately. After a while the Titan began thrashing around. Disaster struck moments later. The thrashing had caused a loose hook to whip out of the ground. Mikasa tried to dodge but suffered a cut to her forearm.

"Mikasa!" Eren screamed as he rushed to her aid.

"Ackerman!" Hanji sounded half-concerned and half-curios . "Are you okay?"

"Y-yeah." Mikasa acted as if it didnt hurt. "My fault for not being on my guard."

"It's okay Mikasa" Eren added comfortingly. "Let's get you to the infirmary."

"Can't be helped let's try again tomorrow." Hanji spoke reassuringly.

Despite this Eren gave her a look. It lasted for a second but Hanji was sure to notice. The look was something she'd seen him do multiple times but did not create the same effect until today. It was as if he gave her a threat.

That night, Hanji found herself observing Theodore who was unusually active. She felt Levi's presence across the experimentation area.

"Back already eh Levi?" Hanji said without looking behind her. "Something bad must've happened since you've brought back an unusually dangerous killing aura."

"Hrr... Ehhh..." Theodore began whimpering out of fear.

"Levi keep your killing aura on." Hanji had her eyes locked on Theodore, she hadn't looked behind her, once. "It seems to be working."

"Hrrr... Rah... ree.." Theodore showed absolute terror since he was the only one who had a clear view of the horror behind the excited Hanji. The Titan could no longer take it anymore it needed to scream. "Aaa-"

"Quiet." A voice ordered from behind Hanji. The titan clamped it's mouth shut almost immediately.

"W-whos there!?" Hanji turned around to see a hooded figure who was sporting a terrible I'm-gonna-kill-you aura. "Levi? Mikasa? No.."

"I'm surprised you did'nt recognize me miss Hanji." Eren slowly removed the hood. "I thought I was one of your favorites."

"Eren?" Hanji was beyond surprised to see him with an Aura like that. "Y-you?"

"I'm here to 'persuade' you to stop putting Mikasa at risk like this." Eren was staring into her soul.

"P-Persuade?" Hanji could'nt hide the fear in her voice. "E-eren. You shouldn't be doing something like-"

"Don't worry." Eren said, causing more fear instead of comforting the trembling woman. "I don't plan to hurt you. I'm just gonna help you deal with your little experiment. Please be discreet, though. I prefer not to show this side of me."

You're not Eren. Hanji's words only echoed in her thoughts as she watched Eren walk towards Theodore.

"Good evening Theodore." Eren spoke. The titan was whimpering, pleading even. Eren continued to speak. "I'll devour you."

Aaaaaah!Theodore and Hanji screamed in unison.

Jean, Sasha, Connie and Armin, who were stationed outside, rushed into the experimentation tent the moment their ears registered the screams.

"Great Wall Sina!" Jean exclaimed. "It can't be... Armin is that Eren?"

"Y-yeah." Armin was unnerved at the sight. "T-this must be something Mikasa-related."

Sasha and Connie were speechless. What happened to them in training camp was replaying itself in front of them.

"Excuse me." Eren looked at them, threateningly. "Please keep everyone else out. I wouldn't want anyone to see this."

Moments later there were already fifteen soldiers outside the tent, clamoring to get in.

"EREN! HAVE PITY ON THEODORE!" Hanji suddenly screamed from inside the tent.

Don't worry. Eren was trying to be reassuring, but instead ended up sounding like a madman. I guarantee we'll get good results from this experiment.

Moblit pleaded to be allowed in. Reluctantly, Armin obliged.

"S-so you guys have seen this before?" Jean asked Sasha and Connie.

What's wrong Theodore? Eren's sickening voice suddenly bellowed from inside the tent. You're just helping me gather some information. Right Miss Hanji!?

"Saw it!?" Connie spat.

"WE EXPERIENCED IT." Sasha added.

"Jean..." Connie's face was one of pain. "Something like t-that changes a man."

"J-just be happy that Eren knows you would never hurt Mikasa." Sasha's face was in more pain than Connie's.

Suddenly Mikasa appeared she was pushing her way through the small crowd. The four guarding the entrance to the tent knew that it would be almost impossible to keep her at bay.

"Guys. What's wrong." Mikasa questioned.

"Nothing Mikasa." Armin answered "It's ju-"

NO! NO! NO! Hanji and Moblit screamed in unison, from inside the tent.

"You expect me to believe that's nothing?" Mikasa looked as if she was gonna run them over and barge into the tent anytime soon. "Where's Eren?"

"Mikasa ple-"

"Ackerman in the interest of the people conducting this experiment, please return to your quarters." Moblit unexpectedly popped out of the tent, mortified. "The same goes for all of you, with the exception of these four."

"Yes sir." Everyone, including Mikasa replied. Mere moments later, there were only five people outside the tent.

C'mon buddy we're not done having fun yet!Eren's sickening voice got a shiver from everyone.

"Your friend" Moblit was tramautized. "Does'nt need to be a Titan to be called a monster."

The Next Day

"I'm very surprised about your discovery Hanji." Erwin spoke to a clearly exhausted Hanji. "Who'd have known that one can kill Titans through exposing them to different emotions."

"Y-yeah." Hanji spoke as if she had been whacked on the head. "T-the body temperature and regeneration of some Titans is directly affected by certain feelings. If their body temperature is too low... death follows."

"Yes. You said this was demonstrated when the Female Titan was captured by Eren." Erwin replied.

"Y-yeah" The mere mention of Titan and the boy's name in one sentence caused Hanji to flinch.

"However, there are some details you have indicated to be non-disclosable in the report." Erwin noticed something different in Hanji's behavior. "Would you care-"

"No!" Hanji replied in a mixture of declaring and pleading. "I am very sorry but please trust me."

"Okay" Erwin decided that it was best to let this one go.

Aftermath: Hanji did her best to ensure that Mikasa only played secondary roles in the following experiments. Hanji kept giving Eren awkward glances that were always met with his usual smile. The glances even led Mikasa to think that something was going on between the two until Eren reassured her that nothing was going on.

Sasha and Connie both have trouble sleeping at night and had to be given stress debriefing by Hanji, who got Armin to debrief her as well.

Jean continued to ask Armin about what happened for a month. Jean even stopped trying to do anything remotely flirty with Mikasa for a week. He too kept giving Eren an awkward glare.

Armin had trouble sleeping with Eren in the same room for a month. He did his best to avoid giving Eren awkward glares.

They all kept quiet about the incident. Now, they all prefer to look at Eren's forehead instead of looking him straight in the eye when he's in a foul mood. They all cringe everytime Eren puts on his combat equipment.

Eren acted as if nothing happened and was enthusiastically participating in Hanji's experiments in a matter of days.