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nana-au · 2 days

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Best Friend Activities

Eren + Armin + You - MDNI

₊˚ପ⊹ Summary: Armin is a virgin and Eren enlists you to help out his best friend. Why is he watching? To make sure he’s doing a good job, of course.

(Dom!Eren, Virgin!Armin, Sub!Reader)

₊˚ପ⊹ an: Eren brings out something feral within me. I'm so sorry. Not proofread!!!

₊˚ପ⊹ wc: 3.2k

₊˚ପ⊹ Warnings: mmf pairing, threesome, slight manipulation, breeding/pregnancy kink, mentions of public sex, f receiving! oral, p in v (no protection <3)

𓂃⊹ ִֶָ

Eren Jaeger was so skilled when it came to getting you all wrapped up in his dangerous plans. There was one time he convinced you to skip class to see a movie. Or another time when you two snuck into a bar before your 21st birthday. It made you blush, but you often thought about the time he fingered you in your college’s library a week before finals. His mouth open and hot against yours as you tried to breathe through the pleasure. His fingers sliding in and out, creating the lewdest noise as he shamed your wet pussy for being so loud - Every day with him was eventful to say the least. It shouldn’t have shocked you when Eren tracked you down on your way to class one day with the news of his next venture. He was a good boyfriend, allowing you time to think about it during your geology lecture.

Armin Arlert - Eren’s childhood best friend. Your face felt hot as the professor droned about naturally occurring crystal formations, you weren’t entirely convinced it was English he was speaking - you were that out of it. Armin. Armin. Armin. Your brain chanted. You were used to Eren’s ideas of a good time but this? This was new.

“I can’t let my best friend graduate college as a virgin! You understand right?” He had that smooth yet exasperated tone while explaining the dilemma. “You’re like nothing I’ve ever had,” he gave you his puppy dog eyes, “You’re the only one I trust to help my best friend with this,” He made it sound so nonchalant, like everyone fucks their boyfriend’s best friend. He noticed your hesitance as you breached the doors of your school’s science department, stopping you before your classroom door. “I’ve never led you down the wrong path, have I?”

You bit your lip, his final words echoing in your mind. He was always so selfless, putting himself before others. He was offering up his girlfriend to make sure his friend’s first time was a positive experience. How could you be the one to cut his streak of charitability short?

𓂃⊹ ִֶָ

Throughout the day you felt more and more positive about what was going to happen - that was until you were in Eren’s bedroom with Armin at the edge of his bed. The blonde was fidgeting with his hands, you could tell he was just as unsure as you were.

“Are you sure you’re okay with this, Eren?” He asked him, giving him the option to back out. He would be lying if he wasn’t interested in you - hell, the whole school was. It seemed to be a weekly occurrence where Eren had to protect you from another man’s attention - it was nerve-wracking how Eren was so nonchalant about sharing you with him now.

“I’m Positive, ‘Min,” his smile was soft and sincere. Armin couldn’t hide the shiver that wracked across his spine. “You don’t mind, right Armin?” he shook his head fervently to Eren, biting down on his bottom lip as he searched for the right words. “I just recalled our talk way back when,” Eren was leaning back against his dresser, arms crossed and demeanor overtaken by cockiness as he continued, “When we first met her?” he spoke like you weren’t there. You were still by the door, rubbing your arms to soothe yourself from your nerves. Your eyebrows quirked at his mention of you, looking at Armin whose face grew even redder. “Do you remember, ‘Min?”

“Y-Yeah,” his voice quivers and his eyes won't move from a spot on the ground.

“What talk?” you speak up. Eren finally turns to you, his teeth peaking out of his smirk.

“Armin, do you want to tell her?” The blonde is speechless, you can see a light sheen of sweat on his features as he looks up to Eren. He shakes his head again, you can almost feel the anxiety that radiates off of him. “It’s okay, she’s here isn’t she? She won’t laugh. Right? You won’t laugh?” he addresses you and you’re forced to agree to soothe Armin. “Go on ‘Min,” he assures him. You move towards him, feeling on edge seeing someone you knew so well be so nervous. He won’t meet your eyes so you chose to sit next to him, putting your hand on his back.

“It’s okay,” you promise him. Silence follows your words and after a couple of minutes Eren decides to put an end to his misery.

“’s really no big deal, he just wanted to fuck you,” you can feel Armin’s body jump from the vulgar choice of words. He wouldn’t have put it so harshly. Before you and Eren were official, Armin had said he wouldn’t mind getting to know you better. He may have also mentioned you were the first girl he ever really felt sexual feelings for. But, again, that was before you and Eren. In this moment, with Eren teasing him and you trying to comfort him, jumping out of the window didn’t sound like a terrible idea.

“I-I mentioned that you were really pretty,” he was trying so desperately to recover but the taller boy would never allow it.

“It’s okay Armin- she doesn’t mind. Seriously,” You nodded along to Eren’s words, starting to feel a little flushed yourself. “You want to fuck him now, right?” you now were on the hot seat, enduring his questioning.

“I agreed to help with his p-problem,” you were even beginning to stutter too. God what was Eren going to do with the two of you? He hovered over your figures on the edge of his bed, watching his best friend and girlfriend squirm at his words.

“Then don’t let me stop you,” You couldn’t move at first, unsure as to what you should even do. He chuckled and reached his hand up your skirt. “Do you need some help getting ready?” his finger looped into your panties and pulled them down to your thighs. You could feel his slender digit nudge your entrance. You hissed at what he found. “Armin, she’s already wet for you,” he laughs incredulously. The blonde finally finds it in himself to move, shifting his body to get a better look. Eren grabs the top of your skirt, pulling it up to your stomach so you were on full display to his friend. He looked shocked. Maybe excited? You were too busy trying not to close your legs at the intrusion to get a good read. “Go ahead, feel,” Eren invites him. He’s hesitant at first, meeting your eyes to make sure it was ok with you. You meekly nod before feeling his cold finger against you. He looks surprised, feeling your slickness on his finger. He nudges the tip of his index against your entrance, probing the velvety skin. “Put it inside,” Eren encourages and you don’t even wait for Armin to check if it’s ok before you are nodding enthusiastically. His soft digit glides into your pussy and he watches, mesmerized by the image in front of him. He can feel the ridges of your walls against his finger and he definitely feels you squeeze around him.

“Fuck,” he murmurs. He pulls it all the way out, watching the way your arousal trails to his finger. Your eyes are wide as you watch him fall in love with your pussy, and Eren pets your head muttering to himself. You’re such a good girl, letting him explore you. He knew you would be perfect for the job.

“Do you see her clit?” he asks his friend. “Girls really like it when you play with that,” he advises him. Armin moves his finger up to your clit and your body jolts at sudden harsh feeling. “Rub it gently. In circles.” and Armin obeys. You feel your pussy clench around nothing, incredibly aroused by Armin’s intense interest in your intimate areas. His face was not unsimilar to how it looks when he studies; His brows furrowed in concentration and his jaw was slightly clenched. He wasn’t meeting your gaze, too transfixed on what was happening below. You let out a small mewl, his finger barely ghosting on your clit making it hard to think.

“What should I do next?” Armin asks Eren.

“What do you want to do next?”

“I want to eat her pussy,”

𓂃⊹ ִֶָ

You were now at the top of the bed with your head underneath a pillow and your pussy enduring Eren’s lesson. He taught him how to swirl his tongue on your clit, how to delve the muscle into your entrance, and that you loved being teased with kitten licks. It felt almost professional the way they talked about your pussy - like you weren’t there. Like it wasn’t attached to you and you weren’t actively moaning at each flick of Armin’s tongue. Eren held down your thighs to keep you from squishing Armin’s head between them, still guiding him on what to do. “Use your finger on her clit again,” he instructed and your legs shivered. His tongue was keeping a steady rhythm in and out of you while his thumb reached up to rub delicious circles on your bundle of nerves. Eren looked proud watching him make you fall apart. “Keep going Armin, she’s gonna cum.” He picked the pace up, and consequently your hips started to rise off the bed. Armin’s face had your pleasure smeared across it as you bucked and pushed your pussy further against his mouth. You were losing control, begging Armin to go faster. “You want Armin to make you cum?” Eren asks you and you cry out a yes. “Armin is making you feel good baby?” and again you are saying yes.

“Yes, yesss. Mmm. I’m gon’ cum,'' you announce and Eren watches as you fall apart with his friend’s face attached to your pussy. When you come down and after a few more gentle licks, Armin’s head pops out from between your legs and he looks dazed. His lower face glistens with your fluid and his mouth heaves trying to take in much needed breaths. He barely gives himself time to process before he’s already wanting to be inside of you.

“Is that ok, Eren?” he asks, even though he’s not sure what he would do if the answer was no. Eren nods, but adjusts your position to be on top of him. He has you propped against his chest as he sits up against the headboard. The dizziness of making you cum fades once he realizes what he’s about to do, growing unsure of himself.

“What’s wrong?” Eren inquires and Armin can’t hold back a blush. Scratching the back of his head, he stares down at the two of you. “Look at her Armin, she wants you too,” and he’s right. You are squirming on top of Eren, your body anticipating what was about to come. Eren makes a show of grabbing your tits still under your shirt. He tweaks at the nipple, keeping his gaze on his friend.

“You won’t be mad?” It was a silly question to ask after he ate you out like a starving man, but he couldn’t help it. Eren didn’t want to admit his reasons were entirely selfish. He loved spilling his seed inside of you, promising one day to give you his kids. He loved watching you squirm as he edged you for hours, reducing you to tears and snot as you begged for release. He especially loved seeing you reach your peak in public, the idea of being caught incredibly arousing to him. He loved how you would do anything he asked of you; He was absolutely going to love you taking his best friend so good for him. All he could do was shake his head ‘No’ for now.

Armin undoes his belt, hands shaking as he pulls his pants down - his briefs joining after a moment of silent contemplation. His cock slaps against his stomach, the tip angry with fat drops of precum spilling out of it. It’s fairly long, but not as thick as Eren’s. He crawls on the bed to join you two. His breath is shaky, looking down at you, and he can't help but squeeze the base of his length before gliding his hand up and down. Eren’s own hand reaches down to your pussy, playing with your entrance again.

“I’ll warm her up for it,” he tells Armin, sliding his middle and ring finger inside of you. You whine at the intrusion and he curls them inside you. He wastes no time hitting the spot that makes you throw your head back. “Kiss her, ‘Min,” he orders him. Your pink lips are wet with your spit and your eyes are half-open, lost in the feeling of Eren’s fingers. You ask Armin to kiss you when he doesn’t move at first. When his lips hit yours, Eren picks up the speed. You’re moaning - struggling to keep your lips pursed. The kiss is wet and sloppy and Armin is stroking himself a little faster listening to the squelch of your pussy. “I think she’s ready,” and Armin doesn’t allow himself another moment to reconsider.

He pulls away from the kiss, lining himself up to you, and pushing himself in. He doesn’t acknowledge that you might need a moment to adjust, he just buries himself all the way in, his voice straining, “Oh shit”. You let out a sharp moan, feeling him bully his way into your tight cunt. Once he’s in he can’t help himself from moving. You can also feel Eren rocking against your backside, matching the rhythm of his best friend’s cock going in and out of your sopping pussy. His pupils are blown out, enamored by the scene in front of him. He pulls your legs back to try and get a better look, causing Armin to go deeper than before. The both of you moan simultaneously at the new angle, your gummy walls massaging his dick perfectly, the head reaching the spot that makes you see stars. You’re completely out of it, drool seeping onto Eren’s shirt as your head rested against his chest. Eren doesn’t even notice - too entranced. Armin’s perfect cock pulls out of you, glistening with your slick, before pounding itself right back in. “It feels t-too good. I can’t last much l-longer..” his moans are high pitched - he completely lost himself in the feeling of your pussy taking him so perfectly. “F-fuck. You’re too perfect,” he hisses, choking out sobs. He’s so overstimulated by how tight you’re squeezing him, how everytime he pulls out your pussy desperately clings to his cock. And the noise - he will never forget the noise. You are so wet - your arousal now leaking down your thighs and smearing itself all over his balls.

“Cum in her, I don’t mind,” Eren promises. Armin picks up speed and he’s completely lost now. His moans are more like pathetic whines. He’s praising your pussy, thanking his best friend for allowing him to cum inside of you. Allowing you to milk his cock so perfectly. He rocks into you a few more times before he reaches impossibly deep, spilling his load. Eren wonders if it's dangerous for his cock to be this hard. You’re clawing at Eren’s thighs and Armin is crying out. He continues to cum, his dick twitching as his semen sprays your walls. He was babbling out a prayer as he came, thanking every deity he could think of that could have possibly made your pussy so perfect. Once Armin finally pulls off of you, his chest heaves, watching some of his fluid spill out of your perfect center. Eren’s fingers reach down to plug you up and Armin could have passed out at the filthiness of it all. “I gotta make sure it all stays in,” he tells Armin. He’s pulling down his sweatpants with his other hand, careful not to move the one keeping Armin’s cum buried in your hole. He shifts underneath you, making it so you’re laying now. “I think my dick would work better keeping it in,” he comments, mainly to himself. You’re squirming on top of him, excited for his thick cock to replace his fingers. He barges in as roughly as Armin - desperate to feel you squeeze his whole length. He makes quick work - fucking Armin’s children back up inside of you. “You think she can hold both of our loads, ‘Min?” Armin’s mouth is almost on the floor listening to his best friend’s dirty talk. “Fuck-” Eren can’t help but curse out. From his friend’s perspective he could see a mixture of fluids build at the base of Eren’s cock, creating a ring around it. The squelching sounds were overwhelming - along with your constant breathy moans. You were completely drunk off of their cocks. They were in awe with how well you took them - how good the attention of your pussy felt. Armin felt himself growing semi-hard, almost jealous Eren was feeling the heaven he just felt. You were truly an angel. “C’mere and rub her clit,” Eren spat out another order that Armin would be too stupid not to follow. He sat at the side of you two, his fingers reaching your nub.

You choked out a sob, “‘Min, you’re s-so good at that,” and he truly was. His fingers were soft and fast and he knew just the right speed to get your pussy clenching on Eren’s cock.

“G-god beautiful. You like him playing with your pretty pussy? Fuck! Squeezing me so tight. ‘M gonna cum inside you. Give you a baby, would ‘ya like that? Gonna breed you so good. All with Armin’s help, huh?” You're lost in his words, his cock - Armin’s delicate fingers. You come loud - you begin crying and reaching for Armin’s hand. He smacks it away, continuing his assault on your clit as Eren pounds into you. One arm is holding you down against him, the other spreading your left thigh open to make you take him well. He’s praising you, “Fuck- this tight pussy baby… ‘feels so good. Want me to come? Want me to mix our loads? Won’t know whose baby it is” His hair is flat against his forehead, almost completely covering his eyes. He can still see though, he’s watching his best friend relentlessly rub your clit and holding your hands so you can’t stop him. He’s overstimulated by the sight and his dick is twitching while rope after rope of cum shoots out of him and into your perfect pussy.

𓂃⊹ ִֶָ

The two boys take their time cleaning you up - not before they spend even longer watching their mixture spill out of you. They both take their turns shoving it back inside of you before watching it dribble out of you again. Armin can’t help himself from teasing your clit a few more times while Eren’s finger plays with the juices falling out of you. He teaches Armin a thing or two about the importance of aftercare, and the two of them clean you up in the bath.

Whilst watching Armin soap up your body Eren heavily considers making this a weekly occurrence.

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