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Biology

Summary:

Armin agrees to help reader with a difficult class, library fucking ensues.

Notes:

I hope y'all enjoy my first fic on this account. I plan on leaving this as a one-shot, but if anyone wants more (or even just gives me suggestions for other fics) I'll probably write it for you :) I tried my best but it's been a stressful time for me so don't judge me too harshly!!!

also please ignore it if your think the formatting is weird, I wrote it in another program so it's weird :(

(See the end of the work for more notes.)

Work Text:

Your bed creaked as you flopped, face-first onto it. You groaned.

“I’m assuming it didn’t go well”

Your roommate said apologetically.

“I don’t wanna talk about it”

You handed her the test paper.

“Yikes”

She winced.

“Yeah, I know… I really needed that grade”

You sighed.

“I studied so hard too. I just wish I could drop it like you.”

You hated biology, but you needed one more science credit for your degree and all of the other classes seemed too hard for you. Your roommate, Mikasa had originally been enrolled in the class with you, but she didn’t need the credit and she was struggling too.

“I wish I could help, but I think we’re pretty much on the same level here.”

Mikasa laughed apologetically.

“I don’t know if this would make you feel better, but Eren’s frat is having a party tonight, we could go”

You considered it. You had another bio test coming up, but it wasn’t like studying had helped your midterm grade. Plus, you could use a little fun after such a bad day.

“I’ll go!”

You answered. Mikasa cheered.

“Yay!! I just got some new outfits so we can get all pretty. I think we could both use some dick tonight.”

She giggled. You rolled your eyes at your friend’s antics, but you agreed. It wouldn’t hurt to drown your academic sorrows in a frat boys abs.

“I have a class soon so I need to get going, but I’ll be back asap so we can get ready.”

Mikasa grabbed her stuff and blew you a kiss, leaving the dorm. You smiled, she always knew how to make you feel less shitty. You decided to put on your favorite playlist and take a nap to calm down a bit


You were shaken awake by Mikasa a few hours later. She was holding two skirts.

“Finally, you’re awake. Which one are we feeling?”

“For me or you?”

You questioned groggily.

“You, silly!! I already picked out an outfit while you got your beauty sleep.”

You giggled and pointed at the black pleated skirt she was holding. It was a bit plain, but cute. You didn’t feel like dressing up too much, especially because it was just a frat party. The two of you spent the next half hour getting ready. She looked nice in dark wash low rise jeans and a black long sleeve crop top with red detailing. You had eventually decided against the skirt, instead opting to wear a lacy black slip dress with a long sleeve mesh shirt underneath. Neither of you had felt like doing makeup so you had just done a simple grunge-y look for both of you. It wasn’t much, but neither of you really felt like dressing to impress for a frat party.

You left the dorm around 8 and set off towards the frat, it was pretty close and neither of you were in heels so you just decided to walk. The party looked pretty crazy already, but that was pretty standard for this frat. You walked in through the side door because the two of you were pretty close with the frat president, Eren. As soon as you walked in the door, Mikasa seemed like her mind was elsewhere. You looked to where she was looking and saw one of Eren’s friends, Jean. Mikasa had been hooking up with him for the better part of the year, and you could tell she really liked him.

“Mik-”

“No! I don’t need to go see him, tonight is about you!”

Mikasa said firmly. You rolled your eyes.

“Miks, I’ll be fine, go get your man.”

“Are you sure?”

“Go!”

You smiled as she rushed off to go say hi to him. They both were clearly very into each other, it was only a matter of time until they became an official couple. You turned away, the party was getting a little loud so you made your way upstairs to go disrtract yourself in Eren’s room. Surprisingly he was in there already, and even more surprisingly, he was alone.

“Hey loser.”

You smiled, shutting the door behind you and plopping down on the bed next to him.

“Hey”

He replied. He seemed a bit out of it and you studied his face. Eren was undeniably attractive, with sharp features and dark hair just long enough to be pulled into a surprisingly attractive bun, leaving stray hairs to frame his face. You thought he was super hot when Mikasa had introduced the two of you and you had hooked up with him a few times in the past.

“Bad day?”

He nodded.

“Same here, wanna talk about it?”

You asked.

“Nah”

He paused for a second, then leaned in to capture your lips in a kiss. You jumped at the sudden action, but slowly leaned into the kiss, matching his rhythm. He turn over to lay on his back, grabbing your waist and positioning you so that you were straddling his hips. You put your arms around his neck, continuing the sloppy makeout. He broke the kiss to hastily pull his shirt over his head. He had a great body, you kissed down his toned chest, sucking and leaving marks all over the expanse of skin. He latched onto your neck, leaving dark hickeys in his wake. You continued down his body, stopping above the growing bulge in his pants, and started to undo the tie of his sweatpants. You tried to pull them down, but he stopped you.

You frowned.

“What’s wrong?”

“It’s not that I don’t want this, I just don't think that either of us is in a good headspace tonight.”

He said apologetically. You were a bit annoyed by him stopping you in the middle of your exchange, but you understood what he meant. You sighed and got off him, laying down beside him and staring at the ceiling.

“You’re right, let’s just talk instead.”

You smiled. The two of you spent the next few hours complaining about your days and catching up. You always loved talking to him and you would be lying if you said that venting to him about your academic struggles didn’t make you feel better. You checked your phone to see a text from Mikasa saying that Jean had left and she was ready to go home whenever you were. It was late, so you texted her you would meet her at the door in a few minutes. You said your goodbyes to Eren but he stopped you before you could leave his room.

“Hey, I can’t promise this will help, but I have this friend who I think could help you. He’s super smart and knows a lot about biology, I bet he would tutor you if I asked.”

“Wait, that actually sounds awesome. If he says yes, I would really appreciate the help.”

You smiled, and he found someone’s contact in his phone, pressing call. You waited as Eren talked to the guy, you couldn’t hear what he was saying, but you assumed it was good when Eren gave you a thumbs up and hung up.

“He says he’s in! I sent him your number so you should get a text from him soon, his name is Armin.”

You thanked Eren profusely and left. Mikasa was waiting for you at the door (albeit with several more hickeys than she had entered with) but you stayed quiet about that, just giving her a smirk. You checked your phone when you got back to the dorm, but there were no texts from the study boy.

Oh well, you thought I’ll check in the morning, I’m tired.

Sure enough, when you woke up the next day, there was a new text from an unknown number

Hey, this is Armin. I’m Erens friend btw, the bio guy.

You smiled. This guy texts like he’s writing a report, you thought.

i know who you are

im ______  btw

tysm for doing this i really need the help im hopeless at bio lmao

what time is good for you?

He started typing almost immediately after your messages sent.

I’m free today, we could meet at the library at 6 if that’s okay with you. I know that’s late, but it gets busy in the afternoon on Saturdays.

It was Saturday and you and Mikasa usually hung out with friends on Saturdays, but Mikasa was at some crafting fair she’d been talking about for ages, so you were free.

im fine with late that sounds good :)

He reacted to the message with a thumbs up. Dork.


After a fairly relaxed day, you prepared to head to the library. It wasn’t really a big deal, so you threw on a big hoodie and the pleated black skirt Mikasa had shown you the day before. You put on some quick makeup and fixed your messy hair, sending a quick omw text to Armin and heading out. The walk to the library was quick, but you definitely wished you had chosen something a bit warmer because the fall wind was quite brisk. As you approached the library, you felt your phone buzz and checked it to see a text from Armin;

I’m in the back of the library, I’m wearing a navy blue hoodie.

ty!

you wrote back

im here ill be there in a sec :)

You made your way into the back of the library. It was beautiful, with intimidating arches on the ceiling and seemingly endless tall shelves filled with all sorts of books. Throughout the labyrinth of literature, there were nooks with tables and plush chairs.

Wow, I should really come here more often.

You thought to yourself as you made your way to the back of the library. It was getting dark outside and it had started to rain, but this just made the dim lighting of the old library feel warmer. It was surprisingly empty, there had been a few people studying quietly towards the front of the library but you didn't see anyone in the back. You rounded a corner to see a cozy nook surrounded by tall shelves with plush chairs and a pretty wood table. There was a guy with at the table, his head was turned away from you but you could see he was wearing light grey sweatpants and a navy blue hoodie.

Ah, that must be him. I’m weirdly surprised he’s blond.

You smiled to yourself

“Armin?”

“Oh!”

He turned around revealing a pretty face, with cute button nose, plump pink lips, and blue eyes like pools that you probably would have payed money to drown in.

Oh…

You plopped your leather messenger back down on the table across from him.

“Hi, I’m Armin Arlert, it’s nice to finally meet you”

He beamed at you, revealing a perfect white smile.

Jesus.

“Eren has told me so much about you.”

“Oh god”

You groaned.

“Whatever he said, he was lying.”

He laughed,

“Don’t worry, I’ve known Eren since we were babies, I know better than to take his word at face value.”

He grinned.

Yeah, you definitely liked this guy.

After a bit more small talk, the two of you decided to start working on biology. You had been a bit skeptical, but he was actually really good at explaining things in a way that felt engaging to you and he clearly knew what he was talking about. Although, he was undoubtedly a good teacher, you couldn’t help but feel a little distracted by how pretty he was. His brow was furrowed and lips unintentionally pouted as he searched for the book he needed. You took the opportunity to quickly text Eren under the table.

WTF EREN YOU DIDNT TELL ME HE WAS GORGEOUS?!?!?!?!?!

You sent the text and looked back at Armin’s face. He smiled as he found what he was looking for, looking back up at you. His phone buzzed and he checked it, quickly doing a double take at what he saw.

“Oh!”

He blushed bright red and placed the phone face down on the table.

“Are you okay?”

You asked, confused at what had gotten him so hot and bothered.

“Um.”

He looked like he was debating whether to tell you something.

“Was this meant for me?”

He asked, showing you his phone which displayed a new text from you.

Well shit.

It was the one you had intended for Eren. You immediately blushed just as he had.

“I’m so sorry oh my god. I uh- I meant that for Eren”

You hid your head in your wands wondering how you could manage to mess up that bad.

“Were you um- were you talking about me?”

He asked softly. You almost lied, but there was really no way to spin it to make it look like it wasn’t about him so you didn’t really have a choice.

“Oh- I um- well, yeah.”

You stammered over your words.

“I’m sorry if this makes you uncomfortable I shouldn’t have said it in the first place. Eren and I just talk to each other about silly stuff and make jokes like that.”

You were scrambling to save yourself from the inevitable embarrassment. He frowned.

“So you didn't mean it?”

“I- what?”

“What you said about me- did you mean it?”

You were taken aback.

“I-”

You paused, debating how to answer that. There was no point in lying anymore.

“I did mean it”

You sighed.

“I completely understand if you aren’t willing to help me anymore and I can leave right now if you want, I-”

“No!”

He interrupted.

“I don’t think you’re weird, I’m sorry for reacting the way I did to your message I’m just not really used to that kind of attention.”

“Yeah, right.”

You giggled.

“No seriously!”

He retorted, making you laugh harder.

“There is absolutely no fucking way you walk around looking like that and genuinely think nobody is thinking about getting into your pants.”

He jumped at your statement.

“I-well, no. I don’t really know what you mean.”

He seemed to be avoiding it so you kept pushing.

“C’mon Armin”

you scoffed.

“You can drop the act, you don't have to act all humble.”

“No! I- um I”

He looked really flustered and was tripping over his words at this point. In any other situation you would have stopped, but something about seeing him all worked up made you want to keep going. He face was flushed a pretty pink and his eyes were wide. You took a quick look around to make sure the two of you were alone before leaning closer to him. He had given up trying to respond at this point, you could hear his breathing getting heavier.

“You don't seriously expect me to think you don’t have people lining up to get your number, to get close to you.”

You paused for a second then leaned closer.

“To do this.”

You leaned in and placed your hand on his thigh. He jumped a bit at the touch, but you just let it rest there gently, you didn’t want to scare him.

“W-what are you doing?”

He stammered as you got up and stood above him in his chair.

“Take a wild guess.”

You smirked, leaning down to straddle him in the plush chair.

“I think I might have some idea”

He responded in a breathy voice. You giggled, you thought it was kinda cute that he was acting all oblivious and inexperienced.

“Oh yeah?”

You smiled, placing both of your hands on his shoulders and leaning in until you could feel his hot breath mingle with yours.

“And do you think you might know what I’m about to do now?”

You asked teasingly. He wet his lips nervously.

“Well-”

You cut him off with a kiss. His eyes went wide and his body went rigid for a second, but then he allowed himself to melt into the kiss. You smiled and tangled one of your hands in his pretty blond hair. He let out a little gasp allowing you to slip your tongue into his mouth. He was a little timid with returning the kiss, but eventually got the hang of it, closing his eyes and allowing your tongue to dominate his. You came up for air after a bit, leaning back to break the string of saliva connecting your lips and admire your work. He had a beautiful expression on his face, almost pleading for more. His already plump lips were wet and swollen.

“Please”

He whimpered.

Jesus, he really is going with this innocence thing… But I’d be lying if I said I didn’t find it a little hot.

You giggled.

“You want more? Help me with this then”

You took his unsteady hand in yours and helped him grab the bottom of your hoodie. He didn’t move, causing you to nudge his hand a little.

“Go on”

“A-are you sure?”

He sounded very uncertain.

“If I didn’t want this I wouldn’t have put your hand there, silly. Do it.”

He paused before tentatively lifting your hoodie over your head and placing it on the floor. You were left in nothing but a black lacy bra. He seemed to be trying to look everywhere except your body.

“It’s okay, you can look.”

You laughed. He tentatively allowed himself to look at your body. Something about the way his eyes looked as he took in your body made you feel all warm and fuzzy inside.

“You can uh- you can touch them if you want.”

You said softly. He nodded, and you took his hand in yours and raised it to your chest. He hesitantly squeezed a bit.

“Is this okay?”

He murmured.

“Yes.”

You smiled as he began to caress the supple flesh of your breasts. You let out a little sigh at the gentle but satisfying touch. He paused a bit and lowered his mouth to your skin.

“Can I?”

You nodded as he started kissing your chest. He bit down causing you to let out a light moan. His eyes went wide and he began sucking on your check, leaving the skin littered with love bites. You clambered to unclasp your bra, throwing it on the floor with your hoodie. He stared for a second and began messing with one of your nipples with his warm, wet tongue and the other with his fingers. The way he treated you felt so special, he seemed to worship your body with his tongue, he was insatiable.

“Please”

You moaned.

“Take it off, wanna see your body”

You tugged at his hoodie. He blushed bright red, coming up from your chest to look at you.

“I- I guess it’s only fair.”

He hesitantly lifted the hoodie and undershirt over his head leaving his blond hair a bit of a mess, it looked really good on him.

Jesus Christ.

You didn’t expect much from a nerd, but he had a really nice body. You were used to bigger guys with muscular builds and that’s what you thought you were attracted to, but this made you question. He was lean but toned, like a figure skater or a swimmer. You needed to touch him.

“Armin I- wow.”

You said, making him blush. You placed a hand on his firm chest and traced down the dips and curves of his beautiful body. You began sucking at his neck and moving down his body, eliciting a string of moans that you were convinced might be the most beautiful thing you had ever heard. He dug his hands into the supple flesh of your waist and pulled your body closer to his. You pulled off your skirt and tugged at his pants.

“Armin please.“

You begged. He seemed hesitant, but he conceded and pulled down his sweatpants, leaving the two of you in nothing but underwear. You tried not to stare at the very obvious shape in his boxers but you couldn’t help it. You reached down to palm his dick through the fabric causing him to groan loudly. You but your other hand over his mouth, grinning at him with half lidded eyes.

“Be careful, we are still in a library.”

You traced the hem of his boxers, eventually pulling them down allowing his fully erect dick to slap against his stomach. He was even bigger than he had looked in his boxers. It was pretty too, he was neatly trimmed and the tip was a pretty shade of pink that matched his lips and it was glistening with precum. You went to touch it, but Armin stopped you.

“Wait- I need to tell you something…”

“Sure?”

“Well I- I’m uh-”

“Spit it out, pretty boy.”

You smiled.

“I haven't exactly done this before…”

“Wait what?”

You sat up abruptly.

“I thought this whole innocence thing was an act. Don’t tell me… You’re actually a virgin?”

He nodded bashfully.

“I understand if you don’t want to continue, It’s fine I don’t want you to feel pressured.”

“No!”

You responded.

“I want to keep going Armin, I really, really want to keep going. I can help you, guide you a bit if you want.”

“Are you sure you’re okay with me being a virgin? Doesn’t that freak you out, don't you think it’s weird?”

“Of course I’m okay with that! I’m just a bit surprised that someone who looks like you hasn’t gotten laid yet.”

He blushed as you continued.

“And honestly, I don’t want to sound like a weirdo, but I’m a little bit excited to be your first, I want to make you feel really good.”

“Okay”

He smiled.

“Make me feel good.”

You returned the grin and gently took his dick in your hand. You moved up and down a bit, dragging your thumb through the precum leaking out of the tip and bringing it to your mouth. His cum tasted a bit bitter but you liked it. You dropped to your knees in front of him staring up at his beautiful form with the most sultry gaze you could muster. You took him in your mouth, making sure to go slow so as to not overstimulate him for his first time. You licked the glistening precum and slowly took more of him into your mouth. You weren’t sure if all of him was going to fit but you wanted to try. He wrapped his long fingers in your hair and began to thrust in and out of your throat slowly.

“Is this okay?”

You couldn't give him a verbal reply so you nodded and he continued. You could tell he was holding back a bit for your sake so you tried to take as much of him as you could into your mouth. He let out a long beautiful moan and started going a bit faster. He was surprisingly considerate for someone who was literally fucking your mouth, but it wasn’t all that surprising considering how sweet he was and the fact that he was a virgin.

“I’m close”

He whined

“Can I-”

He paused, clearly embarrassed.

“Can I cum in your mouth?”

You nodded up at him as he sped up, getting more and more needy the closer he got to his climax.

“Oh my god, you’re so fucking perfect please. I’m so close, so fucking close oh my god!”

He came in your mouth, releasing down your throat and leaving your lips wet with his release as he pulled out. You made sure he was staring directly at you, then swallowed.

“Jesus fucking christ…”

He groaned.

“You’re fucking incredible”

You smiled as you licked your lips clean of his cum. He threw his head back, showing off his sharp jawline and groaned.

“You are- wow, just wow”

“You have a pretty dick”

You giggled causing him to blush profusely.

“Really?”

“Yeah, and I can say that, I’ve seen a few in my day.”

You smiled at him. He smiled back but turned away after a second.

“Um- Is it okay if we keep going?”

He said softly.

“We can do whatever you want”

“Would it be okay if I took these off?”

He tugged a bit at your panties. This time, it was your turn to blush.

“Oh, uh sure!”

He pulled you up from the ground back to your original position on his lap, and slowly pulled your panties down, making sure to be gentle.

“Can I touch you?”

You were dumfounded by the way he could look up at you with such pure and innocent eyes while saying something with such dirty implications, but Armin Arlert was clearly full of surprises. You nodded and he gently moved his fingers over your entrance. He dragged his long  fingers through the wetness leaking from you and brought his glistening fingers up to his mouth. He maintained intense eye contact as he slipped his hingers inside those pretty lips and sucked them clean. You whimpered at the sight.

He is truly something else.

He brought his hand back down to your pussy. He stroked back and forth until he found your clit. You moaned, giving him confirmation that he found it. He smiled and he circled it with his slender fingers. You let out another brethy moan.

“Armin…”

“What do you need baby?”

You blushed at his use of the pet name.

“Need you .”

“Need me where?”

“Need you inside of me.. Please.”

“Anything for you.”

He smiled and slipped his fingers, wet with his saliva into you. You didn’t know what it was about this that felt so satisfying. It wasn’t like you hadn’t been fingered before, but there was something about this that made it special. Maybe it was the fact that you were being fingered by a gorgeous and gentle guy rather than some of the meatheads you had been with in the past (no offense Eren.) Armin slowly scissored his fingers, stretching you out. You moaned in anticipation, you could feel how hard he was already. After another minute of stretching you out, he pulled his wet fingers out of you and once again, sucked them clean. He spat on his hand and rubbed his dick a bit to get it fully hard again.

“Is this okay?”

He said as he flipped you over so that he was the one straddling you and positioned himself at your entrance. You nodded in anticipation.

“Please”

You moaned and he pushed himself into you. You had been with a couple guys around his size, so the stretch wasn’t completely foreign, but it was still a little difficult at first. He felt even bigger than he looked. His hands were on either side of your head and he brought one up to tuck a strand of hair behind your ear. You flung your arms around his neck and kissed him as he began to move. The two of you maned into each other’s mouths, deepening the kiss and sloppily making out as Armin’s thrusts increased in speed. He broke the kiss, looking down at you laying there, eyes half lidded and mouth open. He had a dark look in his eyes, he paused for a second, then to your surprise, spit in your mouth.

“Swallow”

He groaned, speeding up his thrusts. You swallowed, moaning at the speed and his newly commanding voice. You didn’t peg him for the type to do something like that, but you would be lying if you said you weren’t into it. You could tell that you were nearing your climax, and judging by the pace his hips were moving, he probably was too.

“Please Armin”

You moaned.

“I’m so close!”

“Me too”

He managed through moans of his own. His pretty voice mixed with the intensity of his thrusts brought you over the edge.

“Armin!”

You came with a shout of his name and he finished inside of you quickly after. The two of you just sat there for a few seconds, him still inside you, relishing your shared orgasm. He pulled out eventually, leaving your thighs a mess of his cum.

“Shit, sorry. I made a bit of a mess.”

He smiled sheepishly.

“Don’t worry, we can fix this.”

You laughed, grabbing your hoodie and using it to clean some of the cum off of your thighs and stomach. Armin tugged his boxers and sweatpants back on. You began to get dressed too, but you realized you hadn't been wearing anything under your hoodie except a bra.

“Fuck!”

“Hey, it’s okay,  I’m sure it will wash out, and you can wear mine instead.”

Armin smiled at you.

He is so adorable.

You accepted his hoodie happily, you were never big on taking guys hoodies, because you didn’t like the way they felt like you were committing to the guy, but again, there was something different about Armin. He put his undershirt back on and you finished getting dressed too.

“Sorry were didn’t get to fully review the book.”

Armin said apologetically.

“Nah, don’t worry, I’m sure I learned more than enough.”

You paused

“But if you would be willing to tutor me again, I’m free next Friday.”

You smirked as he blushed at your implications.

“Yep, sounds good!”

“Lets do it at my place next time though, wouldn’t want anyone to hear us if we study too loud.”

You giggled as the two of you gathered your books. You walked out together, passing the front desk and receiving a disapproving look from the old librarian.

Oh god she definitely knows

“Do you want a ride home? I don’t want you walking alone this late”

“That would actually be great, my roommate is definitely wondering where I am!”

You laughed.


After a short car ride, you were home, saying goodbye to Armin and leaving him with a kiss on the cheek (which made him blush profusely.) You sent Eren a quick text before unlocking the door.


E: So how was it? How did you like Armin?

You: i liked him. i liked him a lot :)

E: OH GOD PLEASE DONT TELL ME-

You: i plead the fifth <3

E: NOOOOOOOOO

You: okay but if you look at it this way it was kinda your fault for not telling me he was hot!!

E: you seriously need to be locked up

You: be fr eren you can expect me to be in close proximity with a man who was blessed with looks like that and not do something..

E: MY POOR SWEET ARMIN NOOOO

You: im going to sleep now its been a long hard day… toodles!! :)

E: YOU ARE A MONSTER


You smiled and said hi to Mikasa. She definitely noticed the hickeys and hoodie that didn’t belong to you, but you were clearly tired so she didn’t say anything. You flopped down onto your comfy bed.

No way I don’t pass this bio test now!

Notes:

I really hope y'all enjoyed this and I hope it wasn't written too badly. Please excuse any spelling or grammar errors, I dont have a beta reader and I have adhd so I tend to miss things like that. Also, I hope the fingering part wan't too weird, I just have no idea how to describe getting fingered with words and not have it sound super weird lmao.

Anyways, thank you for reading and if you enjoyed, be sure to leave a kudos and a comment to let me know what I should write next!! :)

PS- Always use protection, I know I didn't really say anything about it in this fic, but it's super important!!!!