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daisynik7 · 1 year

Text

In Between

Pairing: Eren x f!reader x Reiner

Genre: college au, one-shot

Rating: Explicit

Word Count: ~4.5k

cw: threesome, cunnilingus, nipple play, blow job, vaginal sex (doggy), creampie, horny reader (I mean, who isn’t), pet names, use of the term ‘big brother’, but there is no actual incest here I swear and I’m so sorry. This is just filth.

Summary: Your “big brothers” from Alpha Tau fraternity take care of you for a night.

Notes: OKAY, so I’ve had this in the back of my mind for a while now. Fun fact for those of you who have read my other series Rush: I originally wanted to make it an Eren x f!reader x Reiner fic but was intimidated about writing a love triangle, so I axed it. Instead, here’s porn with little plot to satisfy this itch. Enjoy! Likes, reblogs, and comments are always appreciated, I would LOVE to hear what y’all think!

Additional Notes: This might be the smuttiest one I’ve written so far, idk, you be the judge. As always, READER DISCRETION IS ADVISED. Also, think of this as an alternate universe to Rush, I’m using a lot of details from it, but there is no correlation. Okay, I’m done talking, have fun.

It’s a Sunday night and Sigma Nu Kappa begins their first chapter meeting of the spring semester. Petra Ral, your sorority’s social chair, stands at the podium, a delighted smile on her face. “Good evening, sisters! I have very exciting news: Alpha Tau has agreed to pair with us this semester! This means we’ll be joining them to collaborate on charity events and most importantly, social gatherings.”

There’s a collection of giggles and pleased hums. Mikasa, your big sister and best friend, nudges you. “This should be fun.”

Although the two of you are the same age, Mikasa rushed SNK as a freshman, you joined as a sophomore this past fall. She picked you to be her “little sister” when you were a pledge, adopting you into her family line called The Angels. Since then, the two of you have been inseparable.

Petra continues. “A neat thing we’ll be doing is combining families! We’ll be assigning each of our family lines to one in Alpha Tau. Consider them your ‘big brothers’. FYI, these were assigned at random.”

She passes a stack of papers to each row. When you get yours, you try to find which family you’re being paired with. Before you can, Mikasa scoffs. “Of course.”

Next to The Angels is The Warriors. You turn to her with a questioning look. “The Warriors?”

“Guess who?”

You pause to think, then answer, “Eren?”

“Yup. Random my ass,” she jokes.

Eren is Mikasa’s actual brother, older by a year. You’ve never met him in person, but you’ve heard plenty of stories about him from her. Petra notices her reaction and grins. “Okay, maybe yours is not so random. It just makes sense!”

“So, what are we supposed to do with our assigned family?”

“It’s just for fun. It’s a nice way to get to know the brothers and build a strong connection with them. They’ll look out for you and take care of you, especially at the parties.”

Since joining last semester, you haven’t properly bonded with anyone in the other organizations, too busy acclimating to sorority life as a new member. Now, with a bit more exposure to Greek Life, it’s time to build your own relations, make new friends. Maybe even find a boyfriend. It’s been a while since you’ve had sex, and you find yourself desperate for it. This new partnership with Alpha Tau is a good opportunity to find potential candidates.

And, with the help of your new big brothers, you might be able to achieve this.

~~~

The first exchange between Sigma Nu Kappa and Alpha Tau happens on Friday night, inside the fraternity house. The theme for the party is Game Day. Everyone is required to wear a sports jersey of some kind. You and Mikasa come in oversized basketball jerseys paired with black bicycle shorts. When you arrive to the house, it’s packed with your sisters and Alpha Tau brothers. Immediately, your big sis leads you into the kitchen where the drinks are.

You help yourself to a serving of Jungle Juice, the common frat party concoction. Mikasa, already on her second, mentions, “I texted Eren. He’s finishing a game of beer pong with Reiner, so they should be meeting us soon.”

You chug the rest of your drink, excited to finally meet The Warriors. Several minutes pass, in which you spend time chatting with your sisters and refilling on more Jungle Juice. You turn around once you hear Mikasa yell, “Finally!”

In front of her are two well-built men, one with dark, brown hair wrapped in a stylishly messy man-bun, wearing a sleeveless jersey, showing off his tone arms. The other has a shorter, blonde cut, standing a few inches taller in a football jersey, displaying his broad shoulders.

“Sorry, the game went longer than expected. Neither of us could sink a shot,” the brunette explains. You assume this is Eren, based on family pics Mikasa has shown you. “So, where’s our new little sis?”

You step towards them, hovering beside Mikasa to introduce yourself. They both smile at you, shaking your hand. “Welcome to the family.”

You exchange small talk, asking the standard questions to break the ice. Reiner, Eren’s big brother in the fraternity, is a senior, scheduled to graduate this spring with his bachelors in psychology. He hopes to eventually become a therapist. Eren is a junior, majoring in education to become an elementary school teacher. You were expecting them to be intimidating and arrogant, the stereotypical frat boys. Lucky for you, they are surprisingly easy to talk to.

In the midst of your conversation, Mikasa checks her phone and announces, “Jean just got here. I’m going to hang out with him for a bit, is that cool?” She seems to be directing it at you, specifically.

“Don’t worry, Mikasa,” Eren says. “We’ll take care of her. Right, Reiner?”

He nudges his big brother, who smirks. “Yeah, we’ll take care of her, alright.”

As soon as Mikasa leaves to hang out with her boyfriend, the energy shifts. Maybe it’s your imagination, but there’s a different vibe being alone with your new brothers. They have polite expressions on their faces, but behind it is something…sinister? Wicked? Naughty?

You refill with more liquor, your nerves getting the best of you now that Mikasa is no longer there to protect you. Before you tip the drink into your mouth, Reiner intercepts and covers the lid with his palm, stopping you. “Don’t drink that anymore. All that Jungle Juice will give you a hangover. Let’s take shots instead.”

“Yeah, we got some vodka in the fridge.” Eren opens the door to the refrigerator, reaching in to retrieve a brand-new bottle of Grey Goose. “Big brother here works for the Psych department so he can afford top shelf.”

“Yeah right, like you can’t afford it with daddy’s money,” Reiner retorts. “Did you know his dad is a doctor?”

You nod. “Yeah, Mikasa has mentioned that.”

“I’m not getting a cent after undergrad, though. He’s pretty disappointed that I’d rather be a teacher than take over his practice. At least Zeke’s going to do it.”

“That’s your half-brother?” you ask. Mikasa’s briefing of her adopted family, the Jaeger clan, is coming in handy.

“Yup,” he confirms, pouring the liquor into three cups, poorly estimating a shot’s worth in each.

“Being a teacher is just as important a job as a doctor,” you comment. “Maybe even more, considering the impact you make on the students. It’s a crime how underpaid they are. That’s my opinion.”

He offers you the shot with a small smile, watching you carefully. “What other opinions do you have?”

“Huh?”

“I’m sure you have lots of opinions in that pretty head of yours.” He passes the third cup to Reiner without taking his eyes off you.

You’re unsure what to make of his comment, so you don’t respond, pretending to be fixated on consuming the shot. The buzz is starting to kick in, cheeks warm, head pleasantly airy, inhibitions loosening the slightest bit. Luckily, you’re being taken care of by your big brothers so that you don’t do anything reckless tonight.

The other two throw back the alcohol easily, Eren quick to refill their cups. He waves the bottle at you. “Want another?”

You refuse. “I’m good, thanks.”

“Can’t hold your liquor?” Reiner asks, moving to stand next you at the counter.

“I know my limits.” You lean into him, comfy against his large physique. You play with the hem of your jersey, observing the other party goers in the living room, dancing to the music blasting through the speakers. Mikasa and Jean are nowhere to be seen, most likely doing it in his room upstairs. You spot a few of your other sisters dancing alongside the Alpha Tau brothers, having a grand old time.

“Should we dance?” you suggest, hoping they agree. You want to join in on the fun.

Eren chuckles. “Reiner doesn’t dance.”

He stands up straight, setting his cup down. “That’s not true. I can dance.”

“I didn’t say you can’t dance, I said that you don’t. I have never, ever seen you dance, dude.”

With a mischievous grin, he looks at you and says, “Well, I guess there’s a first time for everything.”

In an instant, Reiner is leading you to the living room, Eren following close behind. It’s crowded, the small space not accommodating for the size of this party. The three of you squeeze in the middle, surrounded by other warm bodies, too intoxicated to care about being smushed. Someone shuts the lights off and only a dinky strobe illuminates the room. You start moving to the music, bobbing your head back and forth, swaying your shoulders to the melody of whatever top hit is playing. Eren is in front of you, copying your motions, a lazy smile on his face. Reiner is to your rear, close enough that you feel the fabric of his jersey brush against you.

Eren leans forward, lips grazing your ear. “You’re so pretty, you know that?” He shuffles closer to you, still dancing to the music.

From behind, Reiner drifts towards you, hands at your waist, his husky voice hot on your other ear. “You look so good dancing like this.”

It’s sweltering now; from the lack of air in the cramped capacity, the alcohol taking its effect, the swing of your hips in tandem with the bass. Or the situation you currently find yourself in, sandwiched by two extremely attractive men, breathing compliments in your ear, exploring your body. They trap you, Eren’s chest basically pressed to yours, your back flat against Reiner. His hands are still at your sides, while Eren reaches for your nape, pulling you in to kiss along your neck.

You should stop it. That’s what you should do. Whatever this is, it’s wrong. These are supposed to be your quote unquote big brothers. What would Mikasa think?

But something snaps in you. It’s curiosity. The need to know. What would it be like to be fucked senseless by them? It has your imagination running wild. How can you deny this opportunity? It’s basically being served to you on a silver platter.

“Let your big brothers take care of you,” Reiner whispers, nipping at your ear lobe, grinding his hips on your ass. It’s so wrong. So wrong, you keep chanting in your head.

Eren fondles your breasts through your clothes. “You want to feel good tonight, right baby? We can help you feel good.”

Is it the pet name that pushes you over the edge? Or is it the allure of being pleasured by two guys at the same time? Either way, you reach behind you to run your fingers through Reiner’s hair while you take your other hand to tug Eren forward into a sloppy kiss.

“Fuck, I think she wants it,” Reiner murmurs, licking a stripe behind your ear. “Let’s go.”

“Follow us, baby. We’ll take care of you tonight.” Eren grabs your wrist, leading you upstairs to follow Reiner into his room. It doesn’t seem like he has a roommate, considering the beds are combined to create one that is nearly king-sized. Too busy inspecting the interior design of a typical frat boy, which so far consists of flattened boxes of beer packs hung up like posters and a large Alpha Tau flag strewn across one side of the wall, the sound of the door shutting loudly brings you to your senses.

You’re very aware now that it’s the three of you, alone in this bedroom, air dense with sexual tension. Suddenly, you’re nervous. You’ve never had a threesome. It’s certainly been a fantasy of yours, but to experience it first-hand, you start having self-doubts if you can really go through with it.

Eren, sensing your trepidation, puts his arm around you, rubbing your shoulder. “Hey, you okay? We don’t have to do this if you don’t want to.”

Reiner, who’s already sprawled out on the bed in his boxers, clothes promptly stripped off, adds, “Yeah. We can just chill here. It’s all good.”

They’re not pressuring you, which you appreciate. You’re hesitant, sure. But you haven’t changed your mind. You want this. You want this bad.

“I want to do it,” you state, removing your shorts and tossing them aside.

Reiner laughs, sitting up to watch you, shoving his own boxers off. “You’re eager. She’s eager, Eren.”

“Yeah, she is,” Eren muses, tugging at your wrist. “Let’s go to the bed, sweetie.”

Reiner scoots over to make room for you, palming his growing erection, watching Eren strip you nude. When you’re naked, you turn to Reiner to kiss him. He smiles before shoving his tongue into your mouth.

“Lay down for us, baby,” Eren purrs, now naked, boner stiff against his sculpted abs, kissing your stomach. He peers up at you with twinkling eyes, almost innocent, knowing for a fact he’s about to wreck your pussy apart.

Reiner lies beside you, cupping your cheek, large tongue working its way deep inside your mouth. His hand trails down to your chest, squeezing at your breast. “Do you like having your nipples played with?” he asks, lips glossy with spit.

You nod, eyes glancing at Eren, his head positioned between your legs, palms spreading your thighs wide, staring at your pussy already sticky with arousal. Reiner refocuses your gaze on him, muttering, “Pay attention to me, princess.” Another nod and you close your eyes, kissing him, enjoying the soft caress of his hands on your tits.

Below you, Eren, the fucking menace that he is, doesn’t start slow. He wraps his lips around your clit, swishing his tongue against it until you’re whimpering from pleasure.

“Oh fuck, she likes that, Eren. Keep doing that. I want to see her come all over your face,” Reiner smirks, brushing his rough thumbs on your hardening nipples. He moves down, facing your chest, sucking on your breast until it’s hard and plump. “Fuck, your tits are amazing,” he rasps, flicking his tongue.

Eren gives you a break, slowly licking your sensitive bud a few times before latching on once more. It’s almost too much, body instinctually jolting from his touch. You endure it, though; the sensation too divine to stop.

“Finger her, Eren,” Reiner demands, as if reading your mind. The desire to be filled is overtaking everything else.

Tongue flat on your clit, he hums in the response, middle finger teasing your slick entrance before slipping inside, knuckle deep. Still, it’s not enough. Even Reiner knows it.

“Put another,” he growls, eyes focused on your pussy being wrecked as he continues to play with your tits. “Fill her up.”

Eren obeys, sliding his ring finger along with the middle, pumping his digits inside you. You’re a whining mess, unable to control the lewd sounds escaping your mouth. Drool leaks out from the corners of your lips, your tongue lolling out from being fucked out. Reiner chuckles, releasing you with a loud pop. “You’re a loud one, aren’t you? You need something in your mouth to keep you quiet.” He grazes your tongue with his thumb, staring at you hungrily. “Suck on these like they’re my dick.”

All you can do is nod dumbly, grabbing at his thick wrist to stick his three middle fingers down your throat. He pumps them into your mouth as he suckles at your nipples, like an animal desperate for milk.

You’re overstimulated, from having your mouth and pussy stuffed, to your most erogenous zones being consumed by lips and teeth. Your toes curl from the pleasure, throat dry from the endless moaning around Reiner’s rough digits, skin damp with sweat and saliva. The orgasm hits you like a wave of electricity coursing through your veins, exciting every nerve in your body. You whimper on Reiner’s fingers, tickling the back of your mouth, causing you to gag slightly.

“Fuck,” Eren muffles below you, still lapping at your clit. The wet squelches sound even more lewd from your noticeable orgasm. He flicks his tongue on your sticky mess, smearing it over your puffy bud, repeating the action several times until he’s satisfied.

“Ah, Eren. Fuck,” you breath out, mouth relinquished from Reiner. He has been relentlessly working your tits, swollen and sore from his efforts. When he’s done, he slides back up the bed beside you.

“Look at the mess you made.” He grips at your chin, directing your gaze at Eren, who’s face is glistening, smirk coated in your shiny cum.

“You did so good for us,” Eren says, crawling up the bed to join you on your other side. He gently pinches your tit, sucking on your neck. Reiner kisses you on the mouth, massaging the other breast. You grasp their hard cocks, stroking them simultaneously, resulting in both of them moaning.

“Fuck, baby.”

“You’re a good girl, aren’t you?”

“Fuck yeah, she’s such a good girl.”

“So fucking good for us.”

The three of you stay this way for a while, erections growing unbelievably stiff in your fists. One of their hands, at this point you’re not sure whose, is at your clit, tapping it and rubbing fast. You’re convinced that you can come like this if they let you.

“Think she’s wet enough?” Reiner asks his brother.

“Yeah, she’s really fucking wet, dude. It’s going to feel so fucking good.” Eren answers. “Can you take it, sweetie? Can you take Reiner’s fat cock?”

“I can take it,” you breathe out, needy and aching to be filled again.

Reiner moves to the bottom of the bed. “Are you on the pill?”

You nod, humming against Eren’s mouth, occupied with kissing him.

“Good. I want to fuck you raw.”

“Come inside her, Reiner. Give her a fucking creampie,” Eren murmurs, kissing your forehead affectionately, despite the filthy words coming out of his mouth. The way they speak to each other, instructing one another on what obscene act to perform on you next, spurs you on. Makes you feel like you’re in fucking heat, ready to be bred.

“You want my cum inside you, princess? Want me to fill up that tight cunt?” Reiner spits into his hand then strokes himself, teasing your slit with his tip.

“Yes,” you respond, voice shaky.

“That’s not enough for him, cutie,” Eren whispers to you. He massages your clit gently as Reiner slides his cockhead up and down your folds. “He likes it when you beg for it.”

You’re too desperate to care about pride. You’re going to beg for this, no matter what. “Please, Reiner. Fuck me, please.”

“That’s more like it,” he grunts, stroking himself faster. “Get in front of her, Eren.”

Eren gives you one last smooch before sitting up and kneeling at the top of the bed, tossing a few pillows to the floor to make space.

Reiner taps at your hips. “On your hands and knees, slut. And stick that ass up for me.” His voice is raspy, demeanor rougher than a few minutes ago. Something has taken over him; it’s his carnal desire to fuck you into the mattress.

You do as your told, arching your back to give him a nice view of your pussy, wet and fluttering, ready for cock. Without warning, he smacks your ass cheek, laughing. “I’m going to fuck you so good. You have no fucking idea.”

Eren kneels in front of you, erect and oozing with precum. “You’re so cute, you know that? So pretty.” He caresses you delicately, thumb brushing against your cheekbone. “Can you suck my dick, baby? Pretty please?”

You’re beginning to understand the dynamic that’s going on here. Eren is sweet, tender, and considerate. Then there’s Reiner: rough, harsh, and greedy. Opposites of each other, working together to tear you to pieces, rip you into shreds. Two sides of the same coin.

You wrap you fingers around Eren, leaning forward to spread the bead of precum along your lips like gloss. He smiles at you, still cupping your face. “So fucking pretty.”

Reiner continues to tease you, gathering your slick onto his cockhead to rub it on your bud. “I’m going to fuck you now, princess. Let me take care of this pussy.” Aligned with your entrance, he slowly slides in, your walls stretching to adjust to his girth. You hear him suck in a breath behind you, cursing. “Fuck, you’re tight. Such a good girl.”

“You are a good girl.” Eren pushes past your lips. You take him into your salivating mouth, surrounding him with your wet heat, tongue tracing the prominent vein running along his shaft. “Our good girl. Our good fucking girl.”

You bob your head on his dick, further and further until he’s deep down your throat. You keep him there, swallowing around him, resisting the urge to gag on his cock. Through teary eyes, you peer up at him, looking for approval, wanting him to be proud of the way you take it. He meets your gaze, breathing heavily, eyes wild with lust, staring at your stuffed mouth. His kind disposition from earlier is crumbling; he caresses your cheeks tenderly, but his expression gives him away. Still, he stays still, hesitant to take control.

Reiner, however, is on a different level. He starts fucking you, pulling his cock out halfway only to slam it all the way back in, pace picking up gradually after each thrust. The force causes you to plunge further onto Eren, nose buried in his dark pubic hair, spit seeping from the corners of your mouth. Your muffled whimpers vibrate around him, causing him to moan from the sensation.

“Fuck, you’re doing such a good job,” he praises, holding your head cautiously.

Reiner holds you firmly at your hips, fucking you hard and fast, grunting. “Take my cock, princess. Take it like the fucking slut you are.”

You pull off of Eren just enough so that only his tip is engulfed by your mouth. With your fist jerking his shaft, you blow him, swirling your tongue on the slit. “Fuck, that’s it, baby. Feels so good. Gonna make me come.”

“Make Eren come,” Reiner huffs. “Make him nut in that slutty mouth.” He’s found your sweet spot, barely pulling out to hit it over and over. You’re soaked around him, convinced that your arousal is dripping onto the sheets, making a mess of his bed.

“I’m coming,” Eren warns, stomach tight, eyes shut. His warm cum shoots into the back of your throat as you suck him off, swallowing every drip. He slumps against the headboard, catching his breath. “Thank you, baby,” he murmurs, bowing down to kiss your puffy lips. “Thank you.”

“I’m gonna come soon. Gonna fill you up with this load,” Reiner growls. Your ass smacks against his groin, his heavy balls tapping lightly onto your clit. You’re close to your second orgasm, but you need just a little bit more.

“Come here, Eren. Play with it while I fuck her.” It really is as if Reiner can read your thoughts, aware of exactly what you need to push you over the edge, get you closer to that peak.

Eren crawls down the bed, kneeling beside you, hand reaching between your legs, finding your swollen bud. When he does, you cry out, “Ah! Fuck!”

They both laugh, Eren brutally rubbing it as he watches Reiner fuck you from behind.

“Look how creamy it is. That’s all her. She fucking loves it.”

“Our pretty girl loves getting fucked.”

“Pinch her little clit. Make her come on my cock.”

Eren squeezes your clit gently between his thumb and forefinger. It’s too much. You let go, the orgasm so intense, you’re trembling, fists bunched in the bedsheets below you, whining in ecstasy.

“Holy shit, I’m coming.” Reiner thrusts into you a few more times before his cock spurts inside you.

“Fuck,” Eren swears, loosening his grip on you.

Reiner stays in you for several seconds, coming down from his high. He slowly pulls out, his cum and yours leaking out of your fluttering hole. They both breathe out a satisfied fuck, staring at the flow of cum dripping out of your slit. Someone, you’re not sure who, plants a smooch on your lower back. Most likely Eren, the more affectionate of the two. You lower your torso onto the bed, relaxing into the mattress, exhausted and satiated from the insanity that just occurred.

Once again, you find yourself sandwiched between them, both facing you, smiling. You turn on your back to stare up at the ceiling, glancing at each of them, unsure what to say.

Eren is the first to break the silence. “Did you have fun, cutie?” He turns your head towards him, nuzzling his nose with yours.

“Yeah, I did,” you answer, grinning. “That was amazing.”

“You came so much, princess,” Reiner adds, chin grazing the skin of your shoulder, palm tracing languid circles on your breasts. Eren kisses you on the lips while Reiner works on your neck. The three of you stay like this until a phone starts ringing.

“Shit, that’s probably Mikasa,” Eren mutters, breaking away. He hops off the bed to retrieve his phone on the other side of the room. Reiner quickly turns you toward him, taking this opportunity to kiss you passionately as his brother answers the phone. His arms are snug around you, cozy and comfortable in his warm embrace.

You don’t pay attention to Eren’s conversation, focused instead on making out with Reiner. It ends as soon as Eren comes back into bed.

“What did Mikasa say?” you ask.

“She’s looking for us. Specifically, you. She’s worried.”

“About what?”

“Probably about us corrupting you,” Eren laughs, nestling his face into your neck.

“I guess she’s on to something,” Reiner responds, copying Eren.

You snuggle them. “She doesn’t have to know about this. It’ll be our little secret.”

“You’re okay with sneaking around next time?”

“Next time?” In your head, you already decided this would be a one-time kind of deal. Not because you want it to be, but because you assumed they wouldn’t want to do this again.

“You don’t seriously think this is the last time we’re doing this, do you? Baby, you’re too cute,” Eren says, grinning.

Reiner chuckles. “You’re stuck with us now, princess. You’re way too good to let go. Right, Eren?”

“Yeah. I think we’ll keep you for a while.”

End Notes: Happy birthday Eren!