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2021-05-22
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❝ EREN'S EXPERIMENT ❞

Summary:

titan!eren yeager (season 4) x gn!reader (female anatomy)

⠀⠀⠀ you definitely had not expected this situation when you had asked hange about if abnormal titans can still feel sexual desires while their person is still in the nape. it was probably the weirdest question hange had ever heard, but it had peaked their interest nonetheless. they didn’t have an immediate answer for you, but they had made a suggestive comment towards you and eren’s “relationship.” something you had yet to understand as well, but still you don’t blame hange for bringing it up... it may have been the cause of coming here to ask the question in the first place... but they didn’t know that and they certainly didn’t need to know.

oh god this fic is a year and a half old

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⠀⠀⠀you definitely had not expected this situation when you had asked hange about if abnormal titans can still feel sexual desires while their person is still in the nape. it was probably the weirdest question hange had ever heard, but it had peaked their interest nonetheless. they didn’t have an immediate answer for you, but they had made a suggestive comment towards you and eren’s “relationship.” something you had yet to understand as well, but still you don’t blame hange for bringing it up... it may have been the cause of coming here to ask the question in the first place... but they didn’t know that and they certainly didn’t need to know.

⠀⠀⠀what you hadn’t expected - but honestly you should have - was hange telling eren about the strange question. wanting to know if he had been the cause of this strange question, or if he had anything to do with it. the question had also peaked eren’s interest, as he had never thought about using his titan in a ‘sexual way.’ it wasn’t something fairly relevant since all titans don’t have any reproductive parts, and it’s hard to tell gender once transformed. eren smirked to himself as he figured this might be an opportune time to get his feelings for you known, and since you had asked the question, he figured you had some resemblance of feelings towards him. it was basically hitting multiple birds with one stone, and his dick was hard that night thinking about it. it may be a small gamble to see if you really have feelings, but it’s a risk he’s willing to take.

˚ ༘♡ ⋆。˚

⠀⠀⠀ grabbing his coat the next evening, he headed out towards your house which was secluded more outside the walls in order to keep an eye out for anything suspicious. usually you came back everyday to help report so it wasn’t a long trek at all, and you always appreciated company, especially eren’s. so it was no big deal for him to show up unannounced, as when you opened the door, his smirk already had your knees weak.

⠀⠀⠀ “hello sweets,” he says as he leans against the door frame. this was normal for him to throw out cute pet names from time to time, really infusing the sexual tension that almost everyone on the island could feel. you roll your eyes as if the pet name didn’t set your heart a-flame as you gestured him inside, offering tea. “oh i’m not here for tea, i came because of the commander. they’re wondering if you’d be willing to help in an experiment?”

⠀⠀⠀ you tilted your head, not hearing anything about new experiences from hange yesterday, but you guess you can’t ever expect hange’s mind to stop having questions about the strange beasts. thinking if you had any other activities planned, you nodded to answer. “possibly, what’s the experiment about?”

⠀⠀⠀ “oh you won’t know until we get there. top secret experiment. we’ll need to start heading out now in order to reach the experiment spot. care to ride with me?” he says, a sweet grin on his face as he guides you outside to his horse. you bite the blush back as best as you could as you nod. you hear him say a small ‘excellent’ before helping you onto his horse. he slides behind you and traps your body between him and the reins. you both head further away from wall sina. you can hear the sounds of the surrounding landscape, the ragged breaths of the horse and the small grunts from eren from the bouncing. you find yourself slightly leaning back into his chest as he smiles.

⠀⠀⠀ you both sat in almost complete silence, but it wasn’t uncomfortable. you kept your eye on the landscape as you approach wall rose. it wasn’t a fairly long ride, but the comfort in knowing that eren was with you made the ride even shorter. you looked back at him discreetly, but almost ended up falling off. eren was quick to grab your waist and prevent your fall. you felt embarrassed slightly as he chuckled.

⠀⠀⠀ “hold tight, don’t want you falling off now,” he says as you nod, relaxing in his presence as the woods ahead of you became closer. the large trees used to once hide your bodies when trying to train for hiding from titans now serves as a calming area for birds to rest and make their homes. you sign in delight at the crisp air. it was always why you lived outside the city. fresh air and quiet evenings.

⠀⠀⠀ “the sight is just up ahead...” eren says as a small clearing comes into view. you sit up on the saddle as you look for others around the area, however there’s no one. not a single soul, horse, or cart in sight. you figured that either they were already at the clearing, or eren had the wrong sight.

⠀⠀⠀ “eren... where is everyone?” you asked as he smirks, leaning down to whisper in your ear huskily.

⠀⠀⠀ “oh? did i forget to mention that it’ll just be us conducting the experiment?” his words sent a fresh warmth down towards your core. heat slightly pooling in your cheeks at the thought of being alone, and your brain becomes foggy with thoughts about what the hell kind of experiment needed the both of you, alone, in woods in the middle of almost no where. you knew there wasn’t any towns or houses around this area, which made it strange. hopefully this wasn’t dangerous where you both would need backup. swallowing your nerves, you finally get to the clearing, he stops a little before and ties up his horse to a tree. you figured you just needed to trust eren. he wouldn’t bring you out here in order to harm you... would he?

⠀⠀⠀ helping you down onto the ground you looked to see that there was indeed no one else there. it was just the two of you. here. in this clearing. with no one else around for miles. oh it made your core clutch just at the thought. your mind was having a war with itself. to calm down because ‘it’s just an experiment’ and that ‘it’s for science.’

⠀⠀⠀ eren sees your figure staring at the opening, possibly wondering what the hell what was going on. he smirked at your innocence as he walked up to you, wrapping an arm around your shoulders. “beautiful clearin’ ain’t it?” he asks as you nod, looking up at his taller form. even without his titan form, it felt like he was giant. that or you just felt small in his presence.

⠀⠀⠀ he’s grown a lot since the scout training. his body has matured, and he as a whole has matured. no longer the eren you knew who cried at any inopportune moment. he’s learned to deal with himself, and he’s learned a lot from his years of being a titan weapon fighting against other titans in marley.

⠀⠀⠀ “you ready to begin the experiment?” he asks, his voice only above a whisper as you gulp. asking him what exactly the experiment was. he chuckled darkly and just told you to go stand off to the side for a moment. once you got out of the area of impact, you saw him bite his hand, lightening crashing down as eren’s titan form appears. you yelped in shock as muscles wrap around bones, encasing eren in the nape of his hard-to-miss titan form.

⠀⠀⠀ it takes less than a moment for it to fully form. it’s large form towers over your own. his hair flows onto his shoulders as it looks down to you. you felt intimidated and confused at the same time. you can’t read his expression as the titan sits down, crossing its legs as it’s hand stretched out for you. you looked at it confused, but eren insisted by looking down at his hand and back to you. you gulp again as you step into his hand. you fumble as suddenly he brings you up to his eyes, and you feel so small looking at your reflection in his eyes. you grip your hand as he just stares at you. was he admiring you? or was he planning something? is that why he took you out all the way out here? no.. no.. calm down. it’s eren; he would never do anything, hopefully.

⠀⠀⠀ you feel awkward, you don’t know what the experiment is supposed to be, are you supposed to be taking down notes? eren’s titan makes a low sound, his other hand comes up to you, pointing at you before his tongue sticks out, his finger points at it. your face blushes as your mind thinks he means something dirty. but you don’t know if it’s just your mind or if he’s really saying that. mixed messages of panic and lust crowd your brain as eren rolls his eyes. not in a sarcastic and mean way, just in a ‘i’m not gonna hurt you dumbass’ kinda way.

⠀⠀⠀ when you don’t move, he huffs as his finger pushes you over, your ass falls on his large palm as he brings his nose down to nuzzle into your side, breathing heavily over you as you clench your thighs. your cheeks blush at his soft titan skin brushing against your side. he pulls back to look back at you again, his finger points at your clothes, and you can see in his eyes what he means. was he gonna fuck you? in his titan form? oh you wish your thighs and core didn’t clench in anticipation.

⠀⠀⠀ ‘what the hell kind of experiment is this?!’ you panicked in your mind as you hesitated. hoping you knew what he was telling you to do, you slowly remove your clothes. stripping down to your white button up, and underwear. you felt so comfortable, strange but comfortable. it felt like eren was eating up your embarrassment and uncertainty with what was happening at the moment. having his large eyes look down at you as they gloss over with lust. you can feel every groan within eren’s body as he watches you. you unbutton a few buttons, but he stops you, finding it sexy that you’re still slightly clothed. the way you already looked so needy as your chest was exposed to him, his eyes drinking your entire complexion.

⠀⠀⠀ if he’s being honest he finds this entire thing arousing. he can feel it almost more than if he were to do this with his own body, like all his senses have been enhanced. he can feel your heavy breaths as you gulp and clench your thighs. his mind having this almost sick fantasy of having his large tongue overpower your small little cunt had his body almost steaming. his titan stared down at you as you as you finally remove your underwear, leaving your body to only be slightly cover by your top. your chest felt the small breeze from his breaths as your core felt drenched. it felt weird - as if you could read his mind for what he wants. you felt comfortable, felt safe in the palm of his hand. not feeling like you should be ashamed for your body.

⠀⠀⠀ ‘they’re so gorgeous...’ eren thought, his eyes never leaving yours as he nuzzled against your side again, tickling you as you giggle, pushing him away as he smiles inside the nape. he was glad you felt comfortable in his grasp. he wonders if this is why you asked hange. if this was one of your turn ons. if it was, he’s glad he can provide to your fantasies. your eyes fell to the side as you don’t notice his mouth open, his large tongue slipping from it.

⠀⠀⠀ you felt something wet slide up your leg, your eyes snapping to his tongue coming from his mouth. licking around your thigh you gasped. it was warm, but you still hadn’t expected for this. your core becoming increasingly hotter as it approaches your cunt. your legs slightly spread as you couldn’t take your eyes off of his large pink tongue. it licked over your thighs as small huffs of pleasure come from your mouth. you felt so fucking hot. feeling how much your body positively responded to this had your toes curl in anticipation. eren brought his tongue to right above your cunt. he could see how much your cunt was wet. it glistened in the evening sunset. the light making you look like a goddess.

⠀⠀⠀ “eren...” he heard your small voice as you bite into your sleeve. he could see the small twitch in your leg as you looked into his eyes. your eyes begging him to place his hot tongue over where your body desired him for so long. a sigh of relief mixed with a moan graced his ears as you felt a gentle pressure against your clit, everything felt so weird considering it was his tongue from his fucking titan form compared to how it might have been if he weren’t in the nape. feeling him take an experimental lick, you sigh in pleasure. he could see that you liked it. he does it again, adding a bit more pressure as you moan a little louder. it wasn’t even that much simulation, but the thought, the act, the moment made your entire body so sensitive.

⠀⠀⠀ ‘they’re really liking this... what an appealing outcome,’ eren thought as his tongue lapped at your core. seeing how your body twitched and thrusted against his tongue. your reactions and cute little gasps whenever he would press harder against you. it was driving him insane. he wanted more. he needed more of you. his tongue lapped faster against you, and you fell back against his fingers for support, hands gripping into the flesh of his palm and the other getting bit from your mouth. you felt dizzy as you felt your throat choke on air as you felt your coil on the brink of snapping just from a bit of simulation. you felt dirty but the feeling of pleasure overtook any embarrassment you could have ever felt.

⠀⠀⠀ ‘that’s it... you’re gonna cum on my tongue. be a dirty little sweet thing for me and do it...’ you couldn’t even hear him, but you could read his eyes as you stared into them. all the sounds around you consisted of your breathy moans, wet strokes from his tongue, and the innocent nature around you both. his eyes stared at your quivering little cunt. your legs twisting as a few more swipes from his tongue had you cumming. your head falling back against his fingers as your body spazzes against his even-hotter-than-before tongue. your cries louden for a moment as you cum all over his tongue.

⠀⠀⠀ riding out your high, you took a breath to regain your composure and feel your head come un foggy. you grasp at his palm as tears form at your eyes. you never wanted this to end, but eren gave you a small moment to come to your senses. however, it wasn’t long before you felt your entrance being prod at, your chest heaved as sweat streaked your face. he thought it was so beautiful. the sun only enhanced your beauty, and this face you were making was something he wanted to memorize forever. he was gonna keep you for himself. he didn’t care if he was being greedy, you were his. his to fuck you whenever and however you’d both like it. give you all the attention either from his normal or titan form that you wanted. this sense of size over your small body had his own dick aching. but he wanted to test one more thing before you both headed out.

⠀⠀⠀ “w-what are you doing eren?” you asked as his finger held you down, you felt his tongue circle around your entrance. you gulped at you squirmed from the overstimulation, but you slight whimpers tempt him to just push his tongue in full way and ruin your small little pussy. he restrained himself, however, and looked to your already fucked out face. he looked for any sign of struggle, but you nodded your head and slightly spread your legs. you wanted this just as badly as he does, finally understanding what he’s doing. his tongue pressed harder against your hole. you felt it penetrate your walls and you moaned loudly. “eren! stars... that feels so good!”

⠀⠀⠀ eren took that as his queue to push further, making your head fall back as your legs shake with the foreign feel of his large tongue. it hurt, it hurt so badly, but it felt so good. you cried out for him as you held your legs wide for him. you looked into his eyes, seeing your own sinful reflection in his as your body pleaded for more. your eyes shed tears from the pain, which his free hand comes up to wipe away gently and pet your hair. he gave you a moment to adjust. he wanted this to feel good; he would never want to hurt you. when you nodded at him to continue. you immediately moan loudly as he pulls back. the feeling of his slightly gritty tongue against your soft walls was a combination made in heaven.

⠀⠀⠀ “please... eren... give it to me...” you say as he nods gently, slowly easing his way back into you. it was so overwhelming, his tongue was so large it felt like you were gonna break. your head pressed against his fingers, feeling the smooth movements of his tongue against you as you cry out his name like a broken record. your arms grasped to his middle finger for stability, but your body rocked back and forth due to the force of his tongue. slowly but surely the pain passed, leaving your mouth to spew anything from it. you honestly had no clue what was going on rather than the surging pleasure coming from eren’s tongue.

⠀⠀⠀ “stars... i... too much... so good...” you blabbered almost anything that came to mind, your brain so hooked on how fucking good he felt. why did this feel so good? was it the the fact of the matter that he was almost fifteen times the size of you, or the fact his tongue was basically the size of you and was surging inside you? you honestly didn’t know, and your brain was too fuzzy on pleasure to understand how the fuck you felt besides hot and good. you looked down to see that you could see the outline of his tongue fucking inside and out of you. it felt so dirty, being able to feel every muscle of your cunt being stretched to it’s maximum as eren continues to plow into you.

⠀⠀⠀ your legs were honestly starting to give out... not that it mattered, but you knew that due to this experiment - which you honestly forgot that it was one - you would be outta commission for about a week. you’re hoping eren can come up with a good enough excuse to why the hell your body is basically the same as literal gelatin, something introduced by yelena and the others. and you weren’t mad at all as his tip nudged your g-spot, making you literally scream out for him. eren smirked as he abused the spot, loud ass moans protruding from you as your eyes cried from the overwhelming pleasure.

⠀⠀⠀ “eren- more... i’m gonna...” you didn’t need to finish your sentence before eren’s titan growled. the need to pleasure you overfilling all his other senses as his tongue picked up the pace, drool fell from your face as you surged upwards, feeling the tip of his tongue touch the area right below your cervix. he was so unbelievably deep inside you. it turned you on even more as your high crashed over you harder than you had ever expected. your legs twitching and turning as you cried. you cried his name, curses, and so many other things that just leaked from your mouth.

⠀⠀⠀ eren licked at all the remains of your high, letting you calm down from it. his hand came down to the ground, helping you onto the grass and placed your clothes down before stepping away. you saw steam appear from his nape as you saw eren appear from out of the titan, climbing down and rushing over to you. his titan body decomposing in the background as you saw the titan marks below his eyes, accenting his look as he picked you up and placed you in his lap. you lean into his chest as heavy breaths came from your chest, you were still dizzy from the rush of pleasure.

⠀⠀⠀ “how are you? was that alright?” eren bombarded you with questions about you as your brain - which was mush - could not come up with a verbal response before you just grabbed his face. pulling him into a sloppy kiss as eren moaned. his dick might be aching for attention, but with how hard he fucked you, he was more worried for your hips.

⠀⠀⠀ “d-did we do the experiment alright?” you hiccuped as he helped you dress, wiping the drool from your face as he fixed you up. he grinned before kissing your forehead.

⠀⠀⠀ “yes, it proved to be a very good source for my research...” he kissed the side of your head as you leaned into him. humming in content with being able to be of good use to his “research” which now you probably can estimate was not hange’s idea, but you didn’t mind as eren brushed a hand through your hair.

⠀⠀⠀ “did hange tell you about this?” you asked as he chuckled and answered with a ‘yes and no.’ you groaned and swore you would kill them later. eren chuckled again before picking you up, handling you with care as he got onto the horse, untying it as he made sure you both didn’t leave anything behind before heading out,

⠀⠀⠀ “let’s get you home, i’ll cover for your absence sweets,” he says as you swore he was gonna brag to jean about being able to fuck someone best. and you’re just hoping no one else brings it up next time they see you... or else you were gonna kill eren and everyone who heard about it. a part of you hoped he wouldn’t brag, but you knew him better.

⠀⠀⠀ you’re just glad you had said yes to the experiment, and glad that you could have proved service to both you and eren’s dirty minded experiment.