Hi Everyone! This is my first fic posted by myself and I'm so excited to share it with you. I've had this idea in my head for a long time now, as Attack on Titan is my life 3 I'll be looking to post as regularly as possible, however I also work full time so I can't always guarantee a new chapter right away. This will be an Eren/Mikasa/Levi (OT3) fic eventually, but there's still a way to go! The story shall be set in canonverse, but will not follow the timescales given in the manga. There shall be fluff, plot and smutty smut smut all rolled into one. It shall be a rollercoaster and I hope you'll all want to share it with me. So without further ado!

HOLY MA-TRIO-MONY

Eren's POV

It had happened gradually, it wasn't just an overnight thing. Well, certainly not for me. Although upon reflection I suppose it was bound to happen one way or another. She was there, always, right by my side…Mikasa.

Whenever I was sad, lonely or hurt she was always the one to come to my aid, to care for me and look out for me, just as I had done for her years before.

At first I had found it rather annoying. So much so that I would become angry at the mere mention of Mikasa's strength, even becoming physically violent towards her. Jealous would be the best way to describe how I felt, and not because she was constantly gaining more attention than me. I was jealous because I was no longer her protector…

I didn't want to be treated like a child, like a younger brother. I wanted to be the man she thought I was, the man that she deserved. But I WAS a child then and I had no idea how to handle my thoughts or feelings, and with every time I blamed her for my shortcomings or pushed her off me or even just blatantly ignored her, I ended up pushing her further and further away from me.

For all intents and purposes, Mikasa had been nothing but a sister to me. It wasn't until we were out on an expedition that I even had any sort of inkling that her feelings for me had been more than just a familial bond. She had thanked me for saving her life when we were kids, when her parents had been cruelly murdered right in front of her.

She also thanked me for giving her my old tattered red scarf, that it had kept her warm all this time. She leaned in then, and I panicked. I turned away from her but I assured I would wrap that damn scarf around her as many times as she needed me to.

That night Mikasa came to see me in the dungeon, she had been wearing nothing but a flimsy white nightshirt that came just above her knee. At first I thought I was dreaming…or dead, and that she was an angel come down from heaven to take me to a better place, a place without the threat of the titans and a constant stench of burning corpses.

On closer reflection I saw that she had been crying and she was clutching tightly to my scarf, her bottom lip trembling ever so slightly.

"Mikasa? What's wrong?"

"Nightmare." She simply replied.

"What was it about?" I asked her gently.

She was quiet then, and I knew. The nightmares that haunted her mind were the same as those that haunted mine. The all-consuming dread that follows a restless night, the constant fear that your number is up, that the dying screams of those dearest to you will never really leave your future dreams.

"I just wanted to check that you were still alive." Mikasa said after about a minute's silence.

She had looked rather embarrassed that I had caught her in a moment of weakness, obviously wanting to look in control for my benefit. I wanted nothing more than to step off my bed, walk over and give her a hug. However, the chains on my wrists left me constricted and my cell was locked with a key that only Captain Levi or Commander Erwin had access to.

The Captain had walked in then, looking as cold and calculating as always. Despite the fact it must have been well in to the night, the Captain still looked pristine in his uniform, clearly having not slept yet. He hadn't looked remotely surprised to see Mikasa here at this hour.

"Cadet Ackerman, curfew was several hours ago." He said, not looking at me at all.

"What's it to you, shorty?!" She snapped right back at him.

Captain Levi hadn't even flinched at her outburst, just looked mildly bored.

"You have an early start in the morning Cadet, you should get some sleep so you're alert and ready. Don't want to become titan fodder due to your own stupidity. That goes for you too Yeager." He replied, finally addressing me.

Mikasa looked like she wanted to challenge him, but knew that if she did she would just be making matters worse. Instead she opted to stare daggers at him instead as she bid me goodnight and left.

"Oh, and Ackerman!"

She paused to look at him.

"If I catch you down here again at this ungodly hour, I'll make sure you're cleaning horse shit for the next month."

Mikasa muttered something that sounded very much like a "Fuck you" before closing the door behind her.

Once she had left, Captain Levi turned to look at me.

"Now Yeager, get some sleep." He said.

"Yes Captain, goodnight!"

"Goodnight Yeager."

The next few weeks had been relatively quiet, I spent most of the time hanging out with Armin, Sasha, Connie and Historia. There had been no update on when we would be venturing outside again, now that we had found out about Christa's true identity Commander Erwin was taking care of all the planning for the next mission.

This left us all a lot of time to relax. Something that I was not very fond of. The titans were still a very real threat and we were expected to just sit around, drink and be merry.

I must have been brooding for a while as Armin finally decided to talk to me. After watching him for a while, it was clear that he was struggling with something. Like he had wanted to tell me, but was having an internal battle about whether it was a good idea or not.

Very bad idea.

"Uhhh….E-Eren?" He stuttered.

"Yeah?"

"Umm….I don't know how to tell you this…but…." He was hesitating.

"What is it?" I asked, genuinely intrigued by this point.

"Now you need to not get mad…."

"I won't"

"You see, I know you…"

"Go on."

"And I know how you can be…"

"Okay?"

"It's just this thing…" He was rambling now.

"Armin."

"And I don't know how you'll react…"

"Armin spit it out!" I snap.

"MIKASA AND JEAN ARE COURTING!" He blurts out.

And suddenly the world is spinning, there's nothing I can say or do to stop the retched feeling in my gut. I make to stand up and end up falling back down. Armin pulls me to my feet.

"EREN!"

"What do you mean "Mikasa and Jean are courting"?" I ask, finally getting my voice back.

"Well, you see Jean asked Mikasa the other day if she would like to take a walk into the village this afternoon, and she agreed."

"That doesn't sound like Mikasa…what did the horse do? Did he threaten her? Me?" I'm fuming now.

"No, even you know Jean isn't like that. He simply walked up to her, all nervous and red. And when he asked her she said yes, said that she would love to."

"Have they already gone?"

"They left about an hour ago."

"And you left it this long to tell me?!"

"I'm sorry Eren, I didn't know what to do." He replies with his head down in shame.

I stand up and stalk off, hands curled into fists at my sides, ready to strike anybody at the merest annoyance. I am seeing red by now, not even knowing where I'm going until I'm there.

I bang loudly on the door until he answers it.

"What do you want brat?!" he demands.

I don't say anything, but he must be able to tell by looking at me there's something wrong.

"You better come in, but make sure you don't tread dirt all over my fucking room brat"

Captain Levi steps aside to let me in.

Immaculate. That's how I would describe it, the Captain's room is immaculate. There is not one speck of dirt on the scrubbed down floor, the furniture is all sanded to perfection and the walls still retaining their cream colour even in the dimly lit room, and a beautiful fireplace contrasting to the simple decor. He has a pot of water boiling over the fire.

"I was making tea, you want some brat?" He asks.

"Yes please sir."

I sit on one of the chairs beside the fireplace and he brings over a small table and two teacups.

"So…" He says as he pours "…what's gotten you in such a state?"

I bring the teacup to my lips and sip my tea, avoiding his question entirely. He sits in the seat in front of me.

"Having trouble taking a shit?" He ponders.

I almost spray the contents of my mouth over myself and the Captain.

"What?!" I ask, coughing up my own lungs.

"Well there's clearly something wrong, I mean you always walk around looking like someone murdered your cat, but this time is different. So tell me." He states.

"Well you remember my friend Mikasa?"

He nods.

"She started courting this guy from our training group, Jean…"

He leans forward and stops me mid-sentence.

"Hold on, you're talking about the Asian who wears that stupid scarf?"

"Uh yeah"

"The one who follows you and blondie around like a lost puppy, that girl?"

"That's right."

"The one that literally looks as if she'll murder me if I get too close to you?

"That's her sir…."

"Right, wow, okay…so she's seeing a guy?" He asks me, looking somewhat bewildered.

"They went walking into town today, apparently she said she'd "love to go" with him." I say bitterly.

Captain Levi looks thoughtful and takes a moment before he starts talking again.

"Is this the first time they've walked out together?" he asks.

"Yes sir, from what I've heard."

"And have you ever told her how you feel about her?"

"Well she's my sister sir, nothing more." I reply.

The Captain shoots up out of his chair so quickly I almost fall out of mine.

"OH MY FUCKING GOD! Yeager, if I'm Humanity's Strongest then that must make you Humanity's Fucking Stupidest."

"I'm sorry Sir?" I ask, shocked at his statement.

"You're obviously in love with the girl!" he exclaims.

"I AM NOT!"

"What other reason would there be for you coming here in a fit of rage? Plus I've seen the way you look at eachother, pair of lovestruck brats if ever I saw them."

I thought about what he said then, was I in love with Mikasa? It sure made a lot of sense, why I had been so angry, why I wanted to prove to her I was strong, why I was so scared that she'd run off with Jean and leave me.

It had to be it, I was in love with Mikasa.

"What do I do Captain?"

"You know what you have to do brat." He replies, he had sat back down and continued drinking his tea nonchalantly.

"I have to go tell her! She should be back by now…Thank you Captain!" I get up and run in the direction of Mikasa's room.

"Shut the door brat!" The Captain shouts, shaking his head.

I ran through the corridors as fast as I could, before smacking directly into Sasha who had been carrying an armful of potatoes.

"Sasha! I'm so sorry! Have you seen Mikasa?" I ask, still mentally jogging on the spot.

"Oh hi Eren! She's in her room..." I've already run off before she can finish.

"Is everything okay Eren?!" She calls after me.

When I finally make it to Mikasa's quarters, I can't stop myself and end up falling face first into her bedroom. She looks startled and rushes over to me, she's still in her civilian clothes.

"Eren! What's going on?!" she asks, worried.

I stand up and place my hands on her shoulders before looking directly into her eyes.

"I love you."

"I love you too Eren, but seriously what's going on?"

"No, I don't mean it that way…this is going all wrong…Mikasa, I am in love with you."

Her eyes widen and she slowly shakes her head.

"What? You don't mean that…please don't say things you don't mean." She looks to be on the verge of tears.

"I do mean it. I'm love you Mikasa, I always have. Ever since I wrapped you in my scarf and took you home. I never realised I until now, but I need you Mikasa, I've always needed you. And what's more is I want you, I want you more than anything I've ever wanted in my life."

As I spoke I realised it was all true, I couldn't bear to be parted from her, the idea of her loving someone else ripped through me like a knife piercing flesh.

"Then why couldn't you have told me this! Why did you have to wait until someone else takes interest in me?! I'm not just a toy you can play with and then abandon whenever you want! That's not fair Eren!" She's crying as she yells at me and beats on my chest with her fists, it's all I can do not to reach out for her. As I know she needs to get this out.

"I've wanted to be with you for so long Eren! I just needed you to show me you wanted me too! Then I told you how I felt and you just rejected me! You pushed me aside! Do you realise how much that hurt, how this is hurting me right now?!"

"I know, I've been an idiot, I'm still being one right now! But I promise you, if you let me, I will spend every waking moment from now until I die trying to prove this to you. You are the first thing I think of in the morning, the last thing I think of at night, and my every thought in between. Just allow me to show you!"

I couldn't take it any longer, I had to hold her. I pulled her towards me and pressed my lips to hers.

She was stone still for a moment before she reached behind me and grabbed my hair, pulling me closer. My hands are wandering up her back and I feel her heartbeat against mine. I never want this moment to end. I only start to push her away slightly when I start feeling a tightness in my pants…

Several hours later and we are laying on her bed, she has her head on my chest and her hand is intertwined with my mine. We are still fully clothed, having being doing nothing more except kissing.

She is my everything, the woman I have fallen in love with, who I will continue to love for the rest of my life.

Or so I imagined, until two years later, everything changed.

Now this was a long chapter! Haha! POVs will change throughout the story. This was a bit sappy and may seem slightly OOC, but it is important to the story. This was more of a background chapter to give you some idea before the real story starts!

Hope you enjoyed, remember to leave a comment!