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obsessed with this au 😭 i can’t stop thinking of lieutenant sukuna hshshshaha help

Heaven Knows

synopsis. Lieutenant Ryomen has a problem; he was assigned a personal medic, a really pretty one, at that. And, since you were his medic, that also meant you were his in every other aspect, right?

cw. military au, fem reader, enemies to lovers, not so secret pining, jealousy (from Sukuna's end), eventual smut, hanky panky on a desk, answering the phone during s-x, guns, creampie

an. dont fact check anything, this is just fanFICTION 🤗

Available on Ao3

“You should really try to be less reckless, sir.” This was probably the fourth time this evening you let out a huge sigh — and for good reason — while disinfecting the wound. The lieutenant had made more trips to the infirmary this week than you could count on one hand. It was completely unlike him.

“I couldn’t help it,” Sukuna said, in that smooth voice of his. “I was thinking about something much more important than training.”

“So important that you had to get a bullet lodged in your arm, Lieutenant?” you quipped, mentally rolling your eyes.

The pink-haired man gave a bark-laugh, before he replied, “Of course.”

“I didn’t even know they allowed weapons in the training room, much less, guns.”

“Like you would know anything about stuff like that, Doc,” Sukuna scoffed.

You rolled your eyes, adding, “Lieutenant, you do realize your life is in my hands, right now? I wouldn’t say such insensitive remarks if I were you.”

“In that case, I would truly be a happy man dying by the hands of a darling like you.”

When you first received a position at base, you were filled in about all the sergeants, lieutenants, captains, colonels, etcetera, by your fellow colleagues. And while you did have some trouble remembering their ranks — unless you frequently conversed with them, you managed to learn their names, their faces, and their attributes — personality and looks wise — within a week.

Satoru Gojo was a lively, energetic man. You often wondered how someone in his line of work managed to have a smile on their face almost every second of the day. On the other hand, he was rather infamous for fraternizing every opportunity he had, whether it be while being stitched up or even while exchanging flirtatious comments towards enemies on the field. Consequently, he was known more by the title of “Womanizer” rather than by his callsign, “Six Eyes”, which was given to him after he wore two pairs of glasses at once — for reasons beyond you.

Suguru Geto was a much more refined man than the one mentioned before. You often joked between coworkers that he was born to balance out the white-haired man child. It was undeniable that Geto was an exceptionally handsome guy, and you sometimes even caught yourself staring at his sharp jawline. Fortunately, he was both brawns and brains, but he did have quite a foul mouth when it came to insulting the opposing sides while on a mission.

Toji Fushiguro could be described many ways, but calling him muscular was definitely an understatement. You couldn’t find out much details about him, seeing as he didn’t open up much, but you knew he was a happily married man with an absolutely adorable son, whom he took pride in showing pictures of him on his phone in the mess hall.

And lastly, the lieutenant, Sukuna Ryomen. Your first meeting with him was purely impromptu.

After being placed at base, you had taken a habit of using the more personal kitchen whenever the mess hall was closed and you needed a cup of coffee after dealing with so many patients. Luck was on your side that night when you hastily turned to return to your office and were face to face with a man whose mere presence exhibited a feeling of immense fear. Instinctively, you chucked your oh-so dear mug of coffee at the man. When you recognized his rank soon after, and consequently, your subordination, you apologized profusely. And to your surprise, he only let out a laugh, saying, “You’re an interesting breed,” before continuing on his way, leaving you dumbfounded and alone.

Some time after, for reasons unbeknownst to you, you were assigned as someone’s personal medic, which, even to you, was a new term. You didn’t know personal medics existed, and you had no clue what purpose they served being personal. Thus, you were a little curious. When you entered the captain’s office, to meet that someone, you almost shit yourself once you recognized those formidable tattoos and distinctive pink hair. At that moment, you had never had the role of patching up Lieutenant Ryomen, you mainly found yourself taking care of lower ranks, but now you were his personal medic? Unheard of.

You quickly learned what it meant to be a behemoth of a man’s personal medic. You were to be the only person who would be stitching up, patching up, and in general, taking care of Sukuna Ryomen. However, that didn’t mean you were only limited to one patient in the infirmary; that would just be a waste of your talents. You cared for whatever patient you were assigned to, but if you were called on to Sukuna’s aid, you would have to put down whatever tool was in your hand and assist the lieutenant instead.

After being in this arrangement for some time, you decided you wouldn’t mind being a personal medic had you not been assigned to serve Sukuna of all people. To put it bluntly, assisting the lieutenant was like trying to reprimand a child.

Sukuna moved way too fucking much for your liking, and not because he was scared of needles or anything of the like, he just moved and twitched and squirmed because he wanted to get a reaction out of you, rile you up, in other words. Everything was just a game to him. And if you even tried to tell him, “If you keep moving, I will gouge your eyes out with this scalpel, accidentally or not,” he would merely shrug, replying, “And I would report you for insubordination, accidentally or not.”

Whoever assigned you as Lieutenant Ryomen’s personal medic would soon eat their shit, because once you got your hands on them, you swore you would go berserk.

As a child, you learned in school and outside school that people who served in the military were people who were deserving of all things respect and honor. And while most people you came across did live up to their name and role, Ryomen Sukuna was certainly not included in that group.

You were a firm believer in respect being earned, and no matter how many feats that man has accomplished to protect his country, his personality, demeanor, and condescending tone would always override all those achievements.

Oftentimes, you find yourself wondering what godforsaken deed you might’ve done in a past life that earned yourself the role of Sukuna’s personal medic. He had no respect whatsoever towards anyone. And, even when speaking with higher-ups, his true self neither faltered nor subsided. His skill was probably the only thing that kept him from losing his rank, you thought.

Most encounters with the lieutenant ended with you either wanting to rip your hair out or wanting to jump off a clif. He barked orders at you left and right, saying this and that. Sukuna never went a day without aiming at least one backhanded comment towards you. 

It was irritating the way Sukuna found fun in keeping you from caring for other patients. He liked the fact that as long as he was in the infirmary, you wouldn’t be taking care of any other men besides him.

He was, needless to say, an insufferable man, and it was such a shame that he had taken a liking to you. When his mouth wasn’t so foul, he was no better than Gojo. Spewing suggestive, flirtatious comments every second he was near you. If you didn’t know better, you would have thought he was two different people. One second he could be criticizing you on how you performed your job, the next he could be speaking as if you two were in a relationship totally and highly inappropriate considering the actual circumstances.

If you pushed aside his vile, degrading comments, you could almost see yourself falling for his sultry personality. Because, after all, you couldn’t deny the attractiveness of Lieutenant Ryomen — especially when paired with his handsy habits.

Coming across Sukuna in tight spaces, halls, and corridors, always meant he would place a hand on the small of your back as he walked past you. Standing beside him during a briefing usually ended up with his hand casually slung around your shoulders, as if you two were friends or something of the like. You often found yourself with cases of phantom touch whenever Sukuna was away on missions for long periods of time; it irked you endlessly.

***

“Am I going to have to sedate you, sir, in order for you to stop wriggling around like a worm?”

“Dunno, would you like to try?”

Sukuna closed his eyes as you pressed a dampened towel to his wound, applying enough pressure to rid the gash of debris and rubble. This week, the lieutenant had just returned from another successful mission, and was in dire need of some patching up.

“Mm, can’t say it’s not a common fantasy of mine.”

His lips tugged into a sly grin, “How courteous.”

You took a step back and admired your handiwork; once satisfied with the completion of the disinfecting stage, you said, “I’m going to need you to sit up now, so I can start on the stitches.”

This part was usually easy for you, and you often looked forward to it since most patients were silent whilst you stitched them up, save for occasional grunts and groans here and there. But those were to be expected when a needle is piercing your skin.

The lieutenant wordlessly did as he was told, and you soon found yourself standing between his legs as you began to get to work.

For the most part, Sukuna was capable of maintaining his composure during this procedure, but, more often than not, he found himself with a preference for having his hands on your hips, occasionally giving squeezes whenever he felt it necessary. The conversation, in most cases, went like this,

“I highly doubt this is professional, sir,” you commented, but you didn’t remove his hands, because A) you would have to change your gloves, and B) if this was what would keep him from squirming, so be it.

Sukuna leaned down to whisper in your ear, his warm breath fanning your ear, “Maybe, but it doesn’t seem like I’m hearing any complaints.” 

You hesitated, deciding carefully what your next words would be, and in the end, you only breathed out a sigh.

-

Having but a few minutes left of your break, and seeing as your mug was empty, you had no choice but to make your way to the mess hall. You didn’t come around there often; most of the time the place was packed with sweaty, grimy, boisterous men, who had no idea what personal space was. The coffee machine in the kitchen of the infirmary was broken, and even with more than enough men on base, no one knew how to fix it. So, grumbling, you had ventured out of your office.

“Hey, Doc—” An arm was suddenly wrapped around your shoulder as an unfamiliar voice filled your ears. 

“Don’t talk to me,” you cut the kid off before he could say more.

Coffee. Coffee was the only reason you were here, not to chit chat. God, could this machine get any slower?

“Well damn, y’know I just love me a woman who plays hard to get.”

You turned to face the man with a deadpan look on your face, “Well damn, y’know I just love wasting precious time on my break talking to pricks like you.” Fuck, does no one know how to take a hint these days? This had to have been a recruit, because seriously, these cannot be the same people who are protecting this country.

A couple of snickers could be heard from people in line for coffee behind you, and your pursuer couldn’t help but finally leave you be, though, begrudgingly. However, those weren’t the only spectators. Near the back of the hall sat Lieutenant Ryomen and Toji Fushiguro, who were murmuring amongst themselves as they watched the scene unfold.

“I see the way you look at her,” the black-haired man began; an amused smile on his face as he moved around the food on his plate.

“You must be either blind or delusional, then.”

“No need to deny it, Lieutenant; it’s already obvious enough what you think of her. I mean, what kind of man goes as far as shooting himself on purpose just so he can go see his lady friend in the infirmary?”

The distant memory from last week — which was supposed to remain secret — caught Sukuna’s attention, and he glowered at his friend across the table. “I will roast your head on a spit and feed it to your family if you tell her I did that.”

“That’s harsh; you would traumatize poor Megumi.”

You had no idea what was going on. One second you were finally about to walk out of the mess hall with your cup of coffee, then someone’s hands were groping you whilst you were still in line, and the next . . . well, punches were being thrown. It all happened so fast; you weren’t even able to identify who was fighting who until people started breaking up the two men.

Yells filled the mess hall as it became clear who was involved.

“. . .Lieutenant Ryomen?” You almost dropped your oh-so dear cup of coffee in surprise.

“He’s crazy!” cried the man who groped you, as he was held back by a few of his colleagues. It was evident in his voice that he was more than shaken up by the event, and you almost felt bad had you forgotten what started this whole ordeal in the first place.

Sukuna wiped blood from his nose, clearly indifferent to his new injury, “At least I don’t go around harassing women. Did your mother ever teach you manners?”

When Sukuna suddenly turned to face you, it was impossible for you to read his expression. All eyes in the mess hall turned to you, awaiting what the lieutenant would next say.

“As for you, have you suddenly forgotten your job? Infirmary, now,” Sukuna said, in a commanding voice that had you scampering off as the man followed.

“Did I rip my stitches?” asked Sukuna, expectedly.

You heaved out a sigh as you cleaned up Sukuna’s bloody nose, “Mhm.”

“Ah, I thought so.”

“. . .You shouldn’t have lashed out like that. It wasn’t even that big of a deal; I would’ve handled it perfectly fine on my own, y’know.”

“I have no doubts you would, but he put his hands on you, sweetheart. Now that’s a big deal if I’ve ever seen one.” Sukuna’s eyes followed your every move as you patched him back up.

You couldn’t help but stop in the middle of your work to let out a laugh, “So you mean to tell me you’ve never been taught as a kid to share your toys?”

“Not when it comes down to my favorite toy, no.”

“I was joking, Ryomen.”

“Well I’m not.”

“. . .So what’s going to happen to that guy?”

“Dunno, not my decision. But if it was, it would definitely involve a few tears being shed,” Sukuna shrugged.

Sometimes conversations between you and the lieutenant went this way. The both of you speaking to each other as if you two were friends, or close colleagues. And, sometimes you did feel like your relationship was just that. But nonetheless, you couldn’t say you hated the more common tension you two shared.

There was just a spark that occurred whenever you two butted heads. Sukuna was a man who enjoyed riling you up solely to gain a reaction out of you, and you were someone who was angered easily by infuriatingly annoying men. In other words, you two made it work. The captain clearly knew what he was doing when he assigned you as Sukuna’s personal medic.

***

However may it be, your opinion of the lieutenant never changed much. No matter how smooth of a talker he was, he would — eventually — find more ways than you could think to make you want nothing more than his head on a spike. Today — also known as the following after Sukuna’s “incident”, was no different.

The pink-haired man was in the middle of doing nothing when you suddenly stormed into his office, with a crazed look on your face. At that moment, Sukuna decided he had never seen something sexier.

“What the hell did you tell them?” you asked, slamming a hand on his desk as you leaned down to his level.

Sukuna stood up from his chair and rose to the full extent of his height, a sly grin on his lips. “I have no idea what you’re talking about.”

“Don’t give me that shit, Lieutenant.”

He cocked his head to the side, “Don’t swear in my office.”

“How come all of my patients won’t look me in the eye anymore without breaking a sweat? They’re afraid to even breathe in my presence, sir.” You walked around Sukuna’s desk while you spoke, until you reached where he stood.

“Good.” His reply came curtly; simple enough to get another glare from you and obvious enough to confirm your suspicions that he was involved in this, some way or another.

“God! You’re insufferable.”

“You know you love it.”

“Fuck off. I hate your ass, you cocky bastard.”

Sukuna gripped your chin in his hand, bringing your face to his, “Mhmm, you make such a pretty liar.”

All complaints you had were soon swallowed up as Sukuna roughly smashed his lips against yours in a breathtaking kiss.

If you said you weren’t expecting this to happen sooner or later, you would be plain stupid. You two had been dancing around for weeks ever since you arrived at base; tensions could only reach so high before something could happen.

You let yourself melt in his hold as you shut your eyes, submitting under the overwhelming feeling of bliss.

Parting your lips in a gasp as Sukuna slipped his hands under your shirt, it didn’t take long before your bra came undone.

“Mm, fuck. D’you do that often, Lieutenant? You’re awfully quick at it,” you couldn’t help but tease.

“Wouldn’t you like to know?” Sukuna bit your bottom lip, and you felt him smile against you.

Steadying yourself, you placed your hands on his shoulders as you two continued fervently kissing and nipping at each other’s lips. It was well into the evening by now, and you had no reason to worry about more patients, but still, you had a sense that,

“We should—ngh—stop.”

“I know,” came Sukuna’s reply, but neither of you moved nor pulled away.

“This isn’t right.”

“I know.” 

Sukuna licked your bottom lip, and let his tongue explore your mouth once you parted your lips.

“We—hah—shouldn’t be doing this.”

“I know.”

“We have to stop.”

“Fuck no.”

You sucked in a breath as you felt Sukuna’s hand wandering down towards your ass, gripping the fat there hard enough to elicit a whimper out of you. His other hand slipped into your pants, pushing aside your panties and slipping two fingers inside.

“Shit, so big. . .” Your voice drawled as you tightened your grip on his shoulders.

Sukuna murmured sweet nothings in your ear as he quickened his pace, curling his fingers inside of you as he felt you tighten around him, a knot building up in your stomach.

Your shirt was soon pulled up and over your head, discarded somewhere in the office. Sukuna cupped your breasts as he brought his lips to your tits, sucking.

By now, it was safe to say you were a moaning mess. Sukuna gave equal attention to your clit as he did to each of your nipples. Sometimes grazing his teeth, sometimes giving a teasing nibble. The feeling of his mouth on your tits combined with his fingers inside of you had you biting down your moans as you came on Sukuna’s hand.

“Fuckk, what a pretty sight,” Sukuna gave an evil grin as he stared at the mess between your thighs. Making sure your eyes were on him, he brought his fingers to his mouth as he sucked at your leftover cum on his fingers, “And you taste so sweet, too.”

You whined, done with his antics, “Don’t be a tease.”

“Right, right,” Sukuna’s tone was full of mockery, “m’sorry, baby.” 

He turned you around and bent you over his desk, placing kisses down your exposed neck and back. “You really gonna let me do this? I thought you hated my ass,” he snickered.

“Shut up, Ryomen,” you gritted your teeth, before shuddering at the feeling of his hard-on against your thigh. “You better fuck me like you mean it.”

“Don’t worry, sweetheart, I would never plan on giving you less than just that,” were Sukuna’s exact words as his cock slid into you.

Maybe provocation wasn’t your best choice in a situation like this, but it was the smartest, fastest way for you to get what you wanted most.

“Ahh,” moans escaped you left and right, and Sukuna hadn’t even moved yet. Probably just the feeling alone of him inside of you could make you see stars, and you feared — with how big he was — that his dick would be the very last cock you would ever live to take.

“Where’s the snappy mouth from earlier, huh? Don’t tell me you can’t take what I’m about to give you.” Sukuna’s face held a sinister grin as he leaned over you, his lips ghosting the shell of your ear as he spoke, before he slid out just to violently slam back into you. The contact knocked the wind out of your lungs, and you could hardly suppress your scream. 

You winced as the desk rocked under the both of your weights combined, and your mind quickly went to the idea of someone investigating the ruckus that was occurring so late into the evening.

“Fuck, baby. Do you know—hah—how long I’ve wanted to do this? Ever since I saw your pretty little ass prancing around base? God, I swore right then and there, when you threw your coffee at me, I had never seen anything hotter.”

“S’kunaa, ngh!” You arched your back, your tits rubbing against the rough wooden surface.

“I bet you knew how bad I wanted you. And fuck me since I wasn’t the only one,” Sukuna groaned into your neck as his hips snapped against yours. “Do you know how many fuckers have been salivating at just the sight of you? Shit, and you were the one gettin’ all hot headed at me for taking you away from your other patients all the time. Well, now you know why.”

“R—mmph—really?” Your voice was so meek, it made Sukuna almost want to go soft on you.

“I have never lied to you. Hah, I’m going to make this greedy little cunt remember my cock every time you even think of fucking with some other good-for-nothing recruit—”

Ring! Ring! Ring! 

You were brought out of your dazed state at the sudden sound of Sukuna’s phone ringing against the desk, nevertheless, Sukuna never stopped his movements as he continued fucking you.

Ring! Ring! 

Sukuna leaned down to mumble in your ear, “Don’t make a sound, unless you want everybody in this building to know how much of slut you are for some cock from your superior.”

You weren’t given even a moment’s notice before a gun was shoved in your mouth. Was this Sukuna’s idea of some sick joke? Or was he trying to use the weapon as a gag? Either way, you wrapped your lips around the cold steel, and whimpered as Sukuna moved his hand to rub your clit. He was not going to make this easy for you.

“Who is this?” Sukuna asked after picking up, his voice visibly irritated after being interrupted.

You knew the safety was on — the lieutenant wasn’t that insane — but still, there was a rush of adrenaline that coursed through you at the thrill of taking such a risk. You wouldn’t even think of agreeing to this another time unless it was Sukuna who was offering. 

His hands gripped your hips, pulling you impossibly closer as he continued slamming in and out of you at a merciless speed. You whined at the roughness, and your nails scratched and clawed at the desk for any source of leverage. All the while, no noise escaped you.

Your eyes brimmed with tears, your cheeks smudged with running mascara as you choked back a sob. Sukuna knew how to mix pain and pleasure just right, and your eyes continuously rolled back inside your head as he hit every spot inside of you.

“So the files can be taken care of tomorrow? Great. Good night.”

The phone call ended within three minutes, and Sukuna immediately removed the gun from your mouth, throwing it on his desk.

One particularly hard thrust had you seeing stars as you suddenly couldn’t hold back anymore, coming on his cock whilst babbling nonsense. “Nngh, Sukuna, fuck.” Muttering curses under his breath, Sukuna slammed into you one last time, his seed filling you up seconds later.

You laid limp on top of the desk, catching your breath as the mess down between your legs dried. Sukuna trailed a finger down your spine, enjoying the way you shuddered and shivered at his touch. A smile tugged at the corners of the lieutenant’s mouth. Yeah, he definitely wasn’t going to let you leave his office any time soon.

***

“Is this a bra in your office, Ryomen?” asked Toji, as he warily eyed the black lace lying on the carpet floor.

“Fuck.” Sukuna pinched the space between his brows; he must have forgotten to pick up after himself yesterday.

---