Between My Captain and Commander
This story is pure indulgence – Armin/Levi/Erwin is a pairing I can't get out of my head, so I decided to put my daydreams into writing :)
Most of the plot revolves around the threesome relationship (both the smut and emotional side). There's a lot of focus on the different dynamics between the 3 couples of Levi/Erwin, Levi/Armin, and Armin/Erwin.
I've indulged in fleshing out Armin's personal life a little, but if you're only here for threesome/smutty stuff, then these parts are easily skipped!
Note on ages: Armin and his friends are 19 in this story. Levi is 26, Erwin is 27.
Note on setting: I would consider this canon divergent. It's a much softer world, where people have time to go on sexy threesome adventures. Oh and Armin gets to follow his dream of becoming a librarian. As I said, this story is mostly wish-fulfillment :D
Chapter 1: Secret Desires
Armin
Armin and his friends were in the mess hall eating dinner. He was stiff and bruised after a hard day of training drills.
Mikasa looked up suddenly, as if just remembering something. "Oh Armin, did you apply for that library assistant job in the end?"
Eren, distracted from devouring his food, glanced up curiously. "Oh yeah, you sounded really excited about that!"
"Er… no, not yet." Armin admitted. His heart squeezed with guilt every time this topic came up. Sure, the job sounded like a dream to Armin, who struggled with the rigorous training exercises expected of all soldiers. It was a miracle he'd graduated at all last year - his exceptional academic grades had been what saved him.
Securing a position in the library would mean he'd be excused from the heaviest of training activities. His time would instead be focussed on managing and preserving the Survey Corps' books, archives and records.
But less training also meant less time with his friends.
And lately, Eren and Mikasa were spending more and more of their free time alone together. Without him.
"What are you waiting for?" Eren said through a mouthful of bread. "Didn't you say the applications are due soon?"
"Yeah, tonight. I've got my application ready, but I'm still thinking it over. It'd be a big change."
"There's no harm applying. I'm sure you can always refuse the position if it doesn't work out." As usual, Mikasa got straight to the point.
Armin couldn't argue with her logic. He fought back the suspicion that his friends were trying to get rid of him. Just because Eren and Mikasa had started dating, didn't mean they suddenly didn't care about him anymore.
And maybe it was time to pursue his own interests, instead of faithfully following everything his friends did. He needed his own life, he couldn't rely on them for everything.
Mikasa's right. What have I got to lose? After all, Erwin was the one who encouraged me to apply…
A few months ago, he'd helped reorganise the new Commander's expanding stockpile of files in his office. The organisation system had been a mess ever since Erwin took over from his predecessor. He didn't have time to tackle it himself, and had put out a notice looking for volunteers. In the end, Armin had been the only person to offer his help.
He'd spent hours in Erwin's office sorting through the drawers and boxes of folders. It's wasn't the most exciting work – but spending time in Erwin's company was a major highlight. The handsome Commander would chat to Armin while doing his own paperwork, and they built up something of a friendship while Armin worked on his task. Erwin sounded genuinely interested in Armin's stories about his friends, and he spoke freely about the intricacies of his demanding new post as leader of the Survey Corps, as well as sharing a few humorous tales from his own cadet days.
Armin had missed their cosy chats after he finished up the work in Erwin's office. But three weeks ago, Erwin had approached Armin and told him about an upcoming job in the library. The extensive archived material, including valuable books, charts and maps, were in dire need of organisation. As part of Erwin's initiative to update the Survey Corps, he had authorised a new position for someone to help the head librarian in the momentous task of re-cataloguing their records. A whole new organisation system would likely need to be created and maintained.
His heart skipped at recalling Erwin's enthusiasm. He'd praised Armin's intellectual ability to solve problems and devise creative solutions. Nevermind the fact that he already helped out in the library from time to time. He thought Armin would be well suited to the role, if he was inclined to apply for it, of course.
Having such a handsome, powerful man single him out for praise like this left Armin light-headed. He greatly admired the Commander, but also appreciated how he respected lesser soldiers. He always treated Armin like an equal, despite their vast difference in rank.
When it's just the two of us chatting, it's hard to believe he's the leader of the whole Survey Corps. If he was just another soldier like me, I wonder - would we be friends? Or maybe more…?
Before long, Armin's mind was filled with illicit thoughts of the Commander while he was lying in bed at night. Imagining those strong hands all over him, his mouth pressed hard against his own, pleasuring Armin in ways he'd only dreamed of…
Of course, Erwin probably saw Armin as a naïve, newly graduated recruit. Not even a particularly strong or skilled one at that. The friendliness he bestowed on the younger man was likely nothing special - he seemed to be just as charming with everyone.
Perhaps he just pities me. I know people still laugh about my incompetence as a solider. He might have heard about the bullying during my cadet training too, and that whole disaster with Floch… Walls, will I ever be able to put that behind me?
In defiance of all logic, Armin harboured irrational dreams about a relationship between them. Despite his high military standing, Erwin was only twenty-seven – eight years older than Armin. The difference in their experience and station was immense though; and liaisons weren't exactly encouraged between soldiers of any rank.
It was a stupid dream. And yet, Armin's heart leapt every time Erwin gave him one of those warm, charismatic smiles. He couldn't resist imagining a burning, lustful intent behind those kind eyes…
Yes. Armin was known for his intelligence, but he was still suspectable to foolish fantasies and wishful day-dreams.
It was hard not to, when his two beat friends were blissfully in love. As thrilled as Armin was for them, he couldn't ignore the increasing loneliness seeping into his life. And it was something he felt too guilty to mention to the happy couple. He couldn't bear to ruin their newfound joy.
But applying for this library job was a step towards asserting his own individuality. He loved spending time in the library, and after many friendly chats with the head librarian, he was already familiar with much of the work that she did. He was almost certain he'd enjoy working there.
It was time to stop wallowing in self-pity, and take some control back over his life.
The applications for the library post were due by that night. So after dinner, Armin returned to the dorm room he shared with Eren, and took one last look at his completed form. Satisfied, he hurried off to the Administration Building. It was late on a Friday evening, so the place was silent.
Armin debated for a moment. He could drop the his application into the head librarian, but Erwin had also offered to take it back. He and the librarian would be assessing the forms and choosing a candidate together.
If I visit the Commander in his office, he might invite me in for a chat… Maybe that's why he offered to take the form back, as an excuse to see me!
A delicious thrill went through him at the thought, and he chuckled at his overactive imagination.
Armin hurried up three flights of stairs to the Commander's office. The top floor was completely deserted -Erwin's office was the only room of note on this floor. Armin reached the door, and knocked gently. After no reply, he hesitated. The man must be out, or in his private quarters in the Officers' Building. Deciding to try leaving his application on the desk, Armin tested the door handle. It twisted with a tiny click, and he pushed the door open.
I'll just drop this off and go. I'm sure Erwin won't mind…
Armin treaded carefully inside the dark office, and placed his application form on the large oak desk. As he turned to leave, a loud noise made his whole body tense into stillness.
It sounded like… a groan?
The sound came from the room at the back of the office – a sitting room of sorts where Erwin entertained guests and officials, and occasionally held meetings. The door was slightly ajar...
A new sound pierced the silence – a slapping noise, like skin on skin.
"Erwin, please -" someone pleaded.
There was another heavy slap, and a subsequent moan.
"Is that any way to talk to your Commander?" asked Erwin's soft, but powerful voice. "You're such a disobedient soldier, it's no wonder you need to be punished."
"Please, Commander..."
As if pulled by an invisible force, Armin crept a few steps closer to the door. He was baffled, and a little frightened. Why was Erwin hurting one of his soldiers? It was so unlike the kind Commander that Armin was convinced he had to be mistaken.
And that other voice sounds like… No. It makes absolutely no sense - he would never submit to this sort of treatment!
Holding his breath, Armin peered through the gap in the doorway.
It took his eyes a few moments to adjust; there was only a faint glow of candlelight.
Commander Erwin had his back to him. He was fully dressed, his broad back blocking Armin's view of the man in front of him.
Then Erwin shifted forward, and Armin caught a glimpse of the second man. He was bent over the table, trapped by Erwin's larger body. He too had his clothes on, but his tight uniform trousers were pulled down to his thighs.
Erwin trailed his hand along the other man's back, and slid it down to the man's bare backside in a gentle caress.
"Please… harder Commander," the man pleaded hoarsely.
Erwin raised his hand, and brought it back down with a sharp slap.
The other man's cry was unmistakeably one of arousal. It evoked a responding ripple of desire in Armin's belly.
"Hmm… I think you've learned your lesson. You've been very good in accepting your punishment. Maybe it's time for a reward…"
Erwin gripped the other man's waist, pulled him upright, and flipped him around so they were face to face. He kissed him roughly on the mouth.
Then he knelt down. And Armin got his first proper look at the smaller, muscular man.
It was Captain Levi.
Armin stood rooted to spot, too terrified to even breath.
The Captain's eyes were closed, mouth slightly open. He twisted his hand's in Erwin's hair. Meanwhile Armin could take a pretty good guess as to what Erwin was doing, kneeling in front of the Captain.
"Fuck, Commander," Levi panted. His was making little breathless moans, as if overwhelmed by Erwin's efforts.
Never, in his wildest dreams, did Armin ever imagine Levi Ackerman capable of making desperate noises like that. The Captain was always so cool, so composed…
But now here he was, letting Erwin take complete control of his body. And evidently enjoying it.
And the Commander… had Armin ever heard him so dominant? His fear at the larger man's demanding tone had melted into white hot desire. His whole body was on fire – he wished fervently that Erwin was kneeling in front of him, and not Levi.
Armin's legs were stiff from standing so still in the same position. He couldn't stay here; couldn't be caught in the shameful act of spying on his superiors...
He took a cautious step backwards, and another. He turned towards the main door, and took a few more tentative steps.
The floorboard creaked loudly.
Armin froze, his heart in his mouth. There was no way the men hadn't heard the noise.
He made a split second decision to flee the room as fast as possible. Heedless of how much noise he made, Armin dashed through the office door, closing it behind him, and sprinted through the building. He didn't stop running until he reached the Barracks, where he stood panting outside, hands on his knees.
When he got his breath back under a semblance of control, he quietly entered the building and headed to his dormitory room.
His best friend poked his head over the top bunk.
"Hey, you're back! You just missed Jean and Connie; they asked if we want to go into town for the markets at the weekend. I'm sure Mikasa and some of the girls will come too."
Then Eren went into a familiar rant about Jean's new hairstyle. Eren was convinced he was copying him by growing it out long. Armin feigned amusement as he changed into his bedclothes and climbed into bed.
His heart was still racing. And not just from the physical exertion.
The image of Humanity's Strongest Soldier, bent over the table and getting spanked by Commander Erwin was seared into his mind. Not to mention the act Erwin had performed on the raven-haired man afterwards…
A creak from the bunk above sent Armin's pulse spiralling even faster.
"You're very quiet. Are you ok?" Eren frowned. "Don't tell me you like Jean's hair?! You don't need to be polite just because you used to date him."
"Jean can do whatever he wants with his hair. And I'm fine. Just tired." It took every ounce of willpower to keep his voice from shaking.
"Oh, ok. I'll let you sleep then." Eren shifted noisily, and settled back down on his own bed.
A few seconds later he asked curiously, "Did you submit your application for the job in the end?"
Armin's heart froze. Icy dread seeped through his veins, as he cast his mind back to before he'd interrupted the two men in their private encounter.
The application form…
Which I left on Erwin's desk.
Which Erwin will find, and from it surmise that I was the one who ran out of his office…
And witnessed something I wasn't supposed to.
What would the Commander do about it? Dozens of questions assaulted his thoughts. Could he get in trouble over this, would it jeopardise his chance of getting the library assistant job?
There was only one thing Armin knew for certain - he wouldn't be getting any sleep tonight…
Notes: There will be a few chapters of set up before the threesome is established. To keep it interesting, I'll sprinkle in some Levi/Erwin smut, and Armin's sexy dreams. The next chapter is this office scene again from Levi's POV, where we find out his and Erwin's reaction to Armin's intrusion...
The threesome smut will be relatively vanilla to start with, with a lot of focus on consent and taking things slowly. I'm planning to explore my favourite kinks later on, including some light BDSM (at Levi's behest), role-playing, and power play. The POV will mostly switch between Armin and Levi, but some Erwin too.
This is my first time writing smut, I'm both excited and nervous to be sharing this story! If you enjoy the premise so far, please show your support by dropping some feedback! I'm open to plot and smut suggestions too XD