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

Self-Explanation

"Okay, I'm not supposed to go into great details so--" Reiner cleared his throat while squad Hanji listened in.

"There's this... Old facility that's been running for ages, y'know, from generation to generation." He stated.

"And in this facility consists of these vile syringes that contain unknown substances. They transform us human beings into titan shifters. But these only appeal to rare people who can withstand the substances. It's like sending a shockwave from your brain to your feet. Hosts who are unable to withstand the substance will not have the ability to return to their human form once they've transformed.

"Oh my gawd..." Moblit commented.

"Hmmm.... Go on." Hanji listened.

"And... We are subjects. We are organized in numerical order. I am number 2. Eren is supposedly number 7. Now that is a pretty big number of people who are able to transform. There are only seven of us and I assume that Eren is perhaps the last one."

"Who are the other ones?"

"That is where I draw the line. I can't give you anymore information about it."

"So what, you're not on our side?" Moblit says.

"Let's just say I'm just playing it safe, pal. Calm down, would ya?" Reiner responded.

"We have to draw more answers from him." Hanji whispered to Moblit.

"I actually have a few questions." Hanji spoke.

Reiner hesitated to answer with his full will but decided to go with his guts.

"Alright, I'll bite." Reiner stood up, walking towards the bars of the cell.

"What color are these substances?"

"Hmm. Actually, they come in different variety of colors, depending how much damage it does to memory loss. I was given a 'safe' syringe where my memory still lives. The substance is clear, like water."

"And what about Eren?"

"The syringe they gave him was a red one. It erases almost everything from you, your name, your identity, where you came from, everything. It's an extremely dangerous substance." Reiner explained.

"And how come you were given a safe one?"

"Because.... I... I agreed to help them with their research."

"Couldn't you have just ran away if they simply gave you the power?" 

"Yes, I could most definitely do that. But, I stayed behind because of the other people who were trapped in that facility. Poor Eren, he wasn't treated well out of all of us. He didn't take the dose of the substance quite well. It actually caused some side effects where one day he's angry and the next, he completely forgets about it and everything restarts."

"Oh, so you do have a heart." Hanji responds.

"Hey, we're all still human.... But Eren is probably more human than the rest of us back in that facility." Reiner turns away, feeling ashamed.

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A door creaked open, the lights slowly uncovering the familiar figure sleeping in a cell. Reiner enters the room quietly with spare food in his hands.

"Hey, kid. Wake up." Reiner whispered.

He pokes the young man, causing him to jolt upwards.

"Ngh?" He rubs his eyes, sitting up, his hair out of place, his feet chained up, a number tag hangs from his ear.