#emdarkficsfest

…

Eren smirks as he hears the exchange from his room, down the hall. He’s got his head buried in a new hentai game that came out this week, but he heard the exchange all too well. It’s even better when seconds later, he sees his little step-sister storm down the hall and up the staircase, her glossy black hair swaying behind her back. 

She’s cute when she throws her tantrums, her round-ish face puffed up and red, pert ass bouncing up the stairs. Her mother spoiled her rotten when she raised her, and after they moved in with him and Grisha, Grisha wasn’t very strict with her either. “It’s hard when you haven’t been with the child since its formative years,” Grisha had told him once when Eren once expressed his annoyance over the completely unfair, indulgent treatment Mikasa always seemed to receive in this house. “Besides, she’s a cute, sincere child.” And his fatherly eyes had crinkled with affection. 

Brat, Eren had thought at the time (and continues to think so), although he had begrudgingly admitted her cuteness, he knew perfectly well that the only thing she was sincere about was her dedication to academic excellence. She wasn’t above her little tricks of emotional manipulation to have their parents eating out of her hand in order to achieve it. Be it her shiny new MacBook, or the hordes of unnecessarily expensive stationary she stockpiled in her room, all she ever had to say was, “But Mom, it would really help me study better,” and his ridiculous stepmother would procure it for her. 

Academics are really important in our culture, his stepmom would always say with pride, whenever Mikasa came home with an immaculate grade card, or yet another quiz trophy, the spelling bee, some nerdy mathematics tournament that he can’t remember the name of… 

Now that he’s older, a junior in university who barely manages to scrape a passing grade, only home to see her antics on weekends and holidays, he looks upon them with amusement. He’s also become more accepting of the cuteness that he’d deny when he was younger, his irritation and hatred towards his stepsister morphing into a casual attraction that he’d learned to indulge in and take care of secretly. 

He remembers how much he blushed when he was still in high school and his stepmom had folded her underwear into his cleaned laundry pile by mistake. He’d just been putting the clothes away from the pile on his bed into his closet when he spotted the offending pink garment just laying there. His cheeks flaming scarlet, he’d stared at those panties for hours before he’d picked them up with the tips of his fingers and tossed them out of his room, screaming for Mikasa to come pick up her shit. 

Now he welcomes it, seeks it out, willingly does the laundry at home– “My, Eren you’ve grown up into such a responsible boy,” his stepmom had lauded, ruffling his hair and beaming at him– and sometimes even takes one of her used panties into his room for later, wrapping it around his dick when he jerks off to a cute hentai character with long black hair and plush tits. 

He’s smart enough to hide it well, but that doesn’t mean he’s ashamed of it. Quite the contrary in fact; he’s accepted that this is the least the universe owes him for all he had to put up with growing up with a spoiled brat like her. 

Lazily, he smooths down his pants and his waning semi, ties up his long hair into a bun and walks into the kitchen. His stepmother is preparing a batch of her world-famous fried rice, that he knows is no doubt a peace offering to her pouting daughter. “Anything I can help with, Akane?” 

“Oh Eren,” she startles, when she hears his voice– something he’s used to by now; his stepmother is a sweet woman, but with a jittery countenance– “It’s you. Nothing, dear. Why don’t you just sit down? Lunch will be ready in a few minutes.” 

Because Eren is a master at scoring brownie points, he still makes the effort to take out a few plates, setting them out with some water before he sits down to look at her. “I heard you talking about a business trip with Mikasa.” 

Akane looks at him with guilt, and he wants to roll his eyes. He’ll never understand their dynamic, but he sure as hell knows that she has no place feeling guilty about doing her damn job just because his little run of a step-sister has no friends and no life, and demands her mother run circles around her whenever she wants her to. “It’s just for a few days, and I’ll probably be back the night before the Ceremony.” And after a remorseful pause, “But I understand why Mikasa is upset with me… Grisha isn’t here either, he’ll only be back from his Conference after her Graduation.” 

He hands her the bowls for her to fill as she continues to rant, “It’s such an important achievement for a child… Graduating top of her class… Giving the Valedictorian Speech. I did try to tell my boss, but these clients are very important. I can’t avoid it–,”

“ – It’s ok, Akane,” he says reassuringly. “I’ll be home that week. I’ll take care of Mikasa, drive her wherever she needs to go, buy her whatever she needs, be her practice audience… don’t you worry.” And he flashes his charming, toothy grin. 

…

Mikasa, on the other hand, finds his grin significantly less charming. Particularly when she sees it resting on her bed, merely two hours after her mother stood at their doorway, tearfully hugging her goodbye and promising her that she will definitely, without fail, be back twenty-four hours before her graduation ceremony. “Why are you here, Eren?” 

“Promised your mom I’d take care of you.” 

Her jaw drops open. “I don’t need you to take care of me!” 

He stands up, his tall frame eclipsing her smaller one. Flicking her forehead and relishing her pained cry, he says, “... Uh-huh. Who’s going to feed you and make sure you actually make it in one piece to your precious ceremony?”

She rubs her head gingerly, still glaring at him. “I have a large stash of cup noodles for emergencies like this, you know.” 

“Not on my watch. You’ve gotta look good too, Mikasa. Can’t have you on stage looking hollowed out.” 

She’s pretty sure she sees his eyes fall to her tits before he winks at her. “Now get to it. Let’s have a run-through of your speech.” 

Pouting, she turns to get her write-up anyway. “Fellow students,” she begins, “We stand here now at the precipice of our future…” 

Eren yawns exaggeratedly, just to piss her off. “We began high school as children, but we’re leaving here as adults.” When she hears a snicker, she grits her teeth. “What the hell is so funny?” 

Smiling green eyes dance at her. “Your speech, Mikasa-chan.” 

She could punch him, she really wants to, and he really fucking deserves it, but his shoulders are quite broad, arms thick and strong, and quite really she’s spent more time studying than refining her aikido technique. “Out with it then,” she huffs.

“So you’re leaving as an adult, huh?” 

She glares at him with so much fire, her eyes should have burned by this point. As if he weren’t a mockery of an older brother already, now he’s basically saying he doesn’t even remember her birthday? Infuriating. “You know perfectly well I am, Eren. We had a whole party and everything to celebrate. Dad even made cocktails for me—,”

“Sure, sure” he waves her off dismissively, “but you’re still a virgin right?” 

Her cheeks redden up like a tomato. “What the— I mean, how—,” Eren looks at her intently, sprawled on her bed with his big frame, green eyes mocking her. She takes a deep breath. “That is, in fact, none of your business.” 

“But it’s true, basically.” 

It makes her hot, talking about these things with her stepbrother, even whenever he’s teased her before— small comments about her clothes, when his eyes rest on her body, when he’d ask if she had a boyfriend (spoiler alert: she’s never dated). “How would you know?” 

“You’re still as lazy as ever when it comes to your laundry, Mika. I’m still folding and putting away your underwear. From my personal experience, Hello Kitty underwear is not really the preference of someone who’s sexually active.” She’s pretty sure she’s going to combust. “And how are you even getting such childish underwear that fits you? I’m sure your ass is way too big for the kids section.” 

Too big?? Her cheeks burn. She isn’t sure what bothers her more— that he’s been checking out her ass or that he thinks it’s too big. “Get out of my room,” she mumbles, wanting nothing more than to just hide in here till the end of time. 

“Aw, don’t worry, Mika. I can take you shopping, you know? We can get you something nice, something that makes you feel like a proper grown-up. Besides you wanna look good for—,” 

“GET OUT OF MY ROOM, EREN!” 

… 

He leaves; leaves her room and her space, but not without a cheeky spank on her ass as he left, playfully whispering, “Brat.” 

She buries her head in her hands, her cheeks warm against her palms. He’s always been like this, she thinks— or at least tries to convince herself. It was nothing new. He’s always made fun of what she wears, how much she studies; calling her stuck up when she was just studious, a prude when she was just modest. But his words linger in her mind, swirling, making her feel funny in her tummy. This is, indeed, her moment of truly entering adulthood and she is as excited as she is nervous about it. Her lack of sexual experience was something she got made fun of from time to time in school, but she tried not to let it get to her. There’d be a time for it, right? When she’s got two master degrees and a PhD, maybe? And her patents are paying for her expensive lingerie? There was no need to slut around in high school just to feel like an adult. 

Right? 

She could go over the arguments as many times as she wanted inside of her head, but no matter the number of times she told herself things she solemnly believed before, today she just doesn’t feel so certain. 

…

In the end, Eren’s not-so-subtle commentary had the desired effect. If he were completely honest, getting her all hot and flustered was pleasing enough for him, his dick twitching happily when he went back to his room, his brain ready to conjure up a million more images of her spread out on his bed, even redder and shy and bothered as he took off her clothes. 

But the real kicker was this— after he finishes indulging his fantasies and throws away the tissues, he hears a knock on his door. “Oh, Mikasa. What do you want?” 

She looks utterly adorable, blush on her cheeks, teeth biting her lips as she struggles to look him in the eye. “About your offer earlier… Did you mean it?” 

For some reason, he’s blanking hard (might be the orgasm) and he’s not sure if he actually went insane for a hot minute and offered to get rid of her virginity or something… no wait, there’s no way she’d willingly come to him for something like that, right? “… Um,” he says, intelligently. “I always mean what I say, Mikasa.” I guess. Most of his under-the-table flirting, he’d happily follow through on anyway. 

“You’ll take me shopping then?” 

Oh. He rolls his eyes. Stupid brat has been leeching money off of him since she moved in and he’d developed this ridiculous secret crush on her. “What do you want to buy?” 

“Now you’re just embarrassing me on purpose, Eren,” she whines. “Panties! Like you said.” She blushes cutely. “The adult kind.” 

Eren grins. This was going to be fun.

…

“Victoria’s Secret.” She blanches as he rolls up in front of the mall, and she sees the pink branding. “Isn’t this the brand with the skinny girls and the feather wings? I don’t want wings, I want underwear—,”  

“And this is why you’re still a virgin.” He flicks her forehead. “Now get moving Mika, we don’t have all day.” She’s so tiresome, honestly, but she’s unfortunately also the cutest thing he’s ever seen, so he puts up with it. She babbles all the way to the store about how brands really need to make an effort to be more inclusive in their branding, and that it seemed to be more of a white-girls-only kinda store, only to tug on the sleeve of his crew neck before he’s about to enter. 

“Eren.” 

“Hm?”

She shuffles her feet, nervously. “I’ve never gone lingerie shopping before.” 

He lets out a soft chuckle. “That’s pretty obvious from your wardrobe, Mika. Mom still buys you the four-packs from Primark, huh?” 

She nods, mortified. “Well, that’s what I’m here for. To help.” And he grabs her hand and pulls her inside the store.

… 

“Can I help you?” 

A sweet, ditzy looking blonde walks up to them as Mikasa stares stupefied at the racks of racy underwear. As much as he enjoys the idea of walking her through his experience himself, he also likes watching her get flustered in front of someone else. 

He gives her hand a squeeze. “Go on baby, tell her what you’d like to try.” 

Her eyes widen almost impossibly, almost choking at his endearment. She tries to shake out of his grip, but his hand is firm on hers as he smirks at her. 

“Are you going for comfort or style?” 

“Um. Comf—,”  

“— Style.” He flashes his most charming smile at the saleswoman. “What’s your best selling?” 

“Ooh, my personal fave are these ‘Brazilians’,” Mikasa coughs, “No, that’s actually what they’re called. And we have a new bombshell line of thongs with a shiny strap…” 

Mikasa gulps as she sees the garment that the blonde holds up. Lots of lace and barely no fabric to cover her behind. “Looks perfect,” Eren says, encouragingly. “Can you suggest something nice to match it?” 

“Wait, wha—,” 

The saleswoman is already several steps ahead, excitedly picking out something lacy, and strappy. “You don’t want to stay in sports bras forever, do you Mikasa?” He whispers, “Besides, those tits deserve some love.” 

…

As they bill and pay for their purchase, the blonde smiles at Mikasa sweetly. “It’s so nice, your boyfriend has such a great eye for style. I wish my boyfriend would buy me sexy underwear too.” 

Mikasa almost chokes. “B-boyfriend?!” 

Eren however just laughs it off and plays it completely cool. “I’m happy to buy her whatever she wants. I get to reap the benefits after all.” And he winks at Mikasa. 

Fucking perverted asshole.

…

“What was that about?!” She glares at him as he straps himself into his seat. 

“Bought you lingerie,” he says casually, “just like you asked.” 

“That’s not what I mean! You let her think we were boyfriend and girlfriend!” 

“What would you rather have me say? Oh sorry, she’s my little sister, but she has no idea how to pick out underwear for herself, so I’m here to help?” 

Mikasa pouts. “… You’re mean.” 

Eren laughs. “And you’re a brat.” 

… 

“What now?” She asks exasperated, as he stands in her doorway, not letting her close the door. “I need some privacy.” 

“What for?”

She stares at him in disbelief. Her stepbrother had always been annoying, but she swears to God, his colours are out in full swing recently. “I need to try on my stuff, Eren,” she hisses, “the stuff we just bought?”

“You mean the stuff that I just paid for.” He pushes past her and makes himself comfortable on her bed for the second time that day. “... I think it’s only fair that I get to see it.” 

Stuttering, completely thrown off, she asks, “... you’re kidding.” 

He grins at her. “Nope.” 

“It’s just your panties, baby. I’ve seen them all before. What’s wrong with me seeing the new ones?” 

She can’t believe her ears. What’s wrong is that he’d seen them at all in the first place, that he wants to see her change into them, that he wants to see her in a state of undress that was deliberately and intentionally sexy. And that he just called her baby! For the second time today! 

“Go on, then.” 

And somehow she finds herself doing it. Red-cheeked and hot all over, she turns her back to him. “Close your eyes till I’m done,” she says, voice trembling just a little. 

“Sure.” 

She’s not sure if she imagines it, but there’s humour in his voice as he says it. Regardless she shimmies out of her pants… and then her panties. 

He can see how tense she is as she faces away from him, and yes— obviously he was going to peek. She’s got a nice ass, even nicer than he imagined, so nicely shaped from all her martial arts, curving beautifully into long legs. 

And it only gets better because she bends down towards her bag, and the view just gets insanely better. She’s so innocent she has no idea, probably has no clue what a sight that is, ass perfect and round and slightly parted, so he gets a little glimpse of what’s in between. He feels himself twitch, his breathing getting harsher, but he hates that he even has to pretend to close his eyes when she’s half-naked and bent at the waist in front of him. 

Makes him wanna grab her hips and keep her there, spread her ass cheeks and see how his cock lines up so perfectly with her— 

“I’m done,” she says meekly, having unfortunately covered her behind. “You can open your eyes now.” 

They were never fully closed, but it’s amazing in full HD, her sinewy thighs so delicately curved and easy to hold. The panties are a definite game-changer he supposes, trendy strap high on her waist, and rounding out her hips even better. He looks at the purple fabric bunch at her nether lips down at the centre, and he’s fairly certain if he weren’t wearing a baggy sweatshirt, his erection would be as plain as day. 

She looks at him so sweetly, her stuck-up brattishness almost non-existent behind her embarrassment. He could get used to it he thinks, she was always cute when she wasn’t being a brat. “And your bra?” He asks, deliberately flat, trying his best to conceal his horniness.

“But I thought—,” 

“What’re you so shy about, Mika? It’s just me,” he almost pouts, “… your brother. I just wanna see if the stuff I bought you looks good on you.” 

It’s utter, complete bullshit, he just wants to see her tits, the nice lacey bra is just a perk. And speaking of perk, her tits really were perky; he’s blessed enough to see them mere moments later, despite her pouts and her embarrassment. 

His eyes almost pop out of their sockets, she’s always been dressing so modestly, sweaters and sports bras and button-up shirts, he’s never gotten to see just how incredible her tits really were. The lace cups cradle her breasts perfectly, his fingers itching in envy, the cups barely covering her nipples. 

And because he’s thinking more with his dick than anything else, he walks up behind her, places a gentle hand on her shoulder. “How’s it feel?” 

His voice is low, a murmur tickling her ears. He’s nudging her towards the mirror, grey eyes flickering to her own reflection. 

How does it feel? Her eyes linger on her own reflection, the tops of her milky breasts straining in her pretty bra, the curve of her hips in her fetching underwear. His hand resting so innocently on her bare shoulders. “I feel,” she rasps, her gaze catching his in the mirror, dark eyes warm on her bare skin. “… different.” 

And because she really does feel different, molten almost, from the way he looks at her, she can’t really believe the words that come out of her mouth next. “… do I look good, Eren?” 

“Mmm-hmm.” His leg brushes her ass before he puts some distance in between them. “You’ve become such a big girl, Mikasa.”