Half and Half (Oblivious!Eren x Reader x Slight!Yandere Levi)

Experiment

"(First)!!" Eren called out as he ran towards you while you walked in the hallways.

"What, what is it, Eren?" You were startled by his approach as he hides behind your back and grasps onto your jacket.

"What's going on?" You asked as he peeked over your head.

"Aww come on Eren! This won't hurt a bit! I just want a sample of your blood, that's all!" Hanji shouted in excitement as she followed Eren's trail, revealing herself with a needle in hand.

Eren shook his head and sucked his index finger, noting that his finger had been pricked by Hanji.

(5 minutes earlier)....

Hanji examines Eren as he stood tall, watching the young scientist scrutinize his clothed body. Hanji walked around him, unable to determine any difference between him and herself. 

"Wow, you really survived out there on your own, huh Eren?" Hanji commented as she stroked her chin.

Eren didn't really understand her but he decided not to respond.

Amazing..." Hanji grabs onto Eren's hand, noticing the bite marks that were printed on his hand.

"Who bit you?" Hanji asked.

Eren tilted his head in confusion as Hanji ran her fingers across the marks.

"Hmmm." Hanji closely examines his hand.

"Can you open your mouth Eren?" Hanji asked as she opens her mouth and points at it.

Eren was able to understand and obeyed her command as she looked at his straight teeth. She then nods and closes his mouth for him, kindly pushing the jaw back into position.

"I'm gonna have to get a blood sample from you. Will you allow that?" Hanji pulls out a needle and holds in in front of the clueless boy.

"I promise you it won't hurt. It's just like um, a scratch or something like that. Yeah!" Hanji smiled.

"I just need a small amount of blood from you. Yes?" Hanji nods her head violently as her smile widened in happiness.

Eren didn't exactly know what made her happy but with a facial expression like that, it had to be something good. So, he smiled and nodded just like Hanji.

"Oh great! Here, give me your hand." Hanji grabs onto Eren's finger and....

Prick!

(present)

"Oh... I get it now." You nodded as Hanji ended her conclusion.

Eren wraps his arms around your waist, resting his face on your shoulder as you caressed his hair.

"I guess he didn't like it, huh." You commented as he shook his head in response.

"Well, maybe you could convince him. Please?" Hanji begged while you thought for a moment.

"We could do this again tomorrow. He seems... uneasy. Everyone's been talking about him lately."

"Yeah, I did notice that. Levi's been telling me how pissed off he his every time Eren follows you hahaha! Isn't that funny?" Hanji laughed , unaware to the fact that Levi had feelings for you.

"Lance Corporal?" You asked.

"Yeah! In fact, I think he wanted to see you as soon as possible!" Hanji explained.

"Huh... Well, I guess I'm gonna go talk to him then." You sighed as Eren followed you from behind.

You stopped him and shook your head.

"Stay here. You shouldn't come." You tell him, earning a sad frown from Eren. He sucked his finger until it had stopped bleeding, watching you walk away from his side.

"You're really attached to her, aren't you, Eren?" Hanji noticed as she pats Eren's shoulder.

Eren ignored Hanji's comment, still watching you from afar as your distance from him grew more and more.

"Well, how about I introduce you to your fellow subordinates. I'm sure everyone would love to talk to you, titan boy!" Hanji leads Eren to the cafeteria where majority of the people settled. Moreover, Eren was very shy and refused to walk in there.

"State your name and business." Levi called from one side of the door.

"It's (First). You wanted to talk to me?" You replied.

After a second had passed, you see the door had swiftly opened for you by Levi as he pulls you in and closes the door, locking it shut.

"What the hell? You backed away from the man who seemed slightly angry and a little.... Deranged.

"Why did you lock the door?-- Oh..." You were pushed against the wall, trapped in Levi's strong arms as he leans close to your face.

"I don't like it when that 'thing' is near you." Levi says in a quiet low voice.

"W-What?" You turned your face to the side, avoiding his eyes.

"Look at me." He demanded.

"What do you expect me to do? I-I want to be the one to guide him, Levi---"

"No. I think you shouldn't. It's dangerous for you. I want to assure your safety, (First)." Levi calms down a bit, hoping you'd understand him.

"B-But Levi I want to help him."

"What if he's just using you? What if he goes uncontrollable and hurts you? I don't want that to happen." Levi stroked your cheek, making you feel uncomfortable.

"He saved my life. I don't understand Levi. It sounds as if you're...."

Jealous.

"As if I'm what?" Levi asks.

You bit back your tongue and shook your head.

"N-Nevermind." You sighed, earning a small grin from Levi.

"Don't get too close to him, understand?"

"I..." 

"Please, (First). I want you to be safe from him." Levi slightly begged.

You wore a sad face, nodding slowly as he came close to peck you on the cheek.

"I knew you'd do the right thing." He whispered, making you shudder as he released you from his office.

When you exited out of the room, you noticed how Levi came up with all these excuses to get you away from Eren. You sighed in depression, knowing well that Levi was secretly against Eren for joining the Survey Corps, only because of you.

When you entered the cafeteria, you see Eren uncomfortably shaking a man's hand as he nodded while Hanji rested her hands on Eren's shoulders.

"And this here is George." Hanji spoke as Eren nodded.

Obviously the boy's not going to remember all these names. He didn't even keep track. He just went along with Hanji and so forth.

"Hanji, I don't think he'll know everyone's name." You approached to them, earning a wide smile from Eren. 

"I just wish he could just understand us. We need to teach him english again." Hanji spoke.

"Again?"  You repeated.

"It seems that there's a possibility that Eren might've lost all his memories and lived outside beyond the walls. If there's anything that could trigger a memory, I'm sure he'll learn to be human in no time." Hanji responded.

"I see..." You looked into Eren's green orbs, noticing his stare towards you. 

"Eren, what happened?"