Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/10608654.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/F
  Fandom:
      Persona_5
  Relationship:
      Makoto_Niijima/Sae_Niijima
  Character:
      Niijima_Makoto, Niijima_Sae
  Additional Tags:
      Femslash, Sibling_Incest, Incest, Oral_Sex, Spanking, Masturbation,
      Masochism, Sadism
  Stats:
      Published: 2017-04-12 Words: 3072
****** S and M - Sister Act ******
by Jemina
Summary
     Sae figures out Makoto's secret. Not the secret you think, but rather
     an altogether more embarrassing one. Extreme smut!
Notes
     I'm actually halfway through playing Persona 5, but Makoto and Sae's
     relationship definitely made my ears prick up. Makoto herself seems
     like she really could be a closet freak, so I went with the idea as
     far as I plausibly could. Comments very much welcome, and I might
     continue it for another chapter if there's any interest. Enjoy!
Makoto was settling in for a quick masturbation session when she heard Sae
returning early for work. Makoto sprang up from her bed and took a second to
think about where she should stash her sister's underwear. She put the pair of
Sae's worn panties she had snuck out of the hamper under her pillow, re-
buttoned the top two buttons on her school blouse and hurried out of her
bedroom.
The long hallway between her room and the front of the spacious apartment they
lived in allowed Makoto to smooth her hair and clothes out before Sae could
notice anything out of the ordinary in her appearance. Makoto's simple brunette
bob and light makeup worked to her advantage there.
Makoto headed straight for the kitchen and was not at all surprised to her
sister pouring herself a drink. Sae's long silvery blonde hair immediately drew
her eye. It was unavoidable, and part of the reason why Makoto felt invisible
when she and her sister were out together .
Her tailored black skirt suit perfectly straddled the line between attractive
and sexy. The black pumps Sae was wearing made her look quite a bit taller than
Makoto. However the heels, even combined with the age difference between them,
couldn't hide the fact that Sae would likely always be a few inches taller than
her sister.
Although Makoto knew she was pretty herself and had more than a few admirers
among her classmates, she had always felt outshone by her sister. Next to Sae's
glamorous looks, she felt almost plain. That was probably the reason why Makoto
was so turned on by her sister. After all, she honestly couldn't say she was
attracted to any other women like that.
Sae was pouring what looked like gin into a small glass, something that her
sister certainly would have never drank before she started going out with her
colleagues after a case was finished. Makoto waited for Sae to drop an olive
into her glass before speaking.
"Hi Sis. Tough day?" Makoto inquired politely. It was important to let Sae know
that Makoto was not ignorant of how hard her job was.
"Yes. Were you studying?" Sae asked with disinterest, swirling the gin in her
glass.
"Yes, of course." Makoto answered automatically. She had learned by now that
the correct answer to that question was always yes, regardless of whether it
was true or not.
"Good. Let me know when dinner is ready." Sae instructed after draining her
glass.
Makoto watched her sister kick off her heels and walk over to the coffee table
in the living room where she had already left her briefcase. Sae would be going
through the files there until Makoto called her back to the kitchen for dinner.
Which wouldn't take long to make at all, considering Makoto had already filled
the rice cooker earlier and planned to pair it with miso soup and some of the
very expensive sushi Sae had delivered to their apartment every week.
 
Makoto set the table and made certain to pour another glass of gin for Sae. Her
reasons for doing so were not entirely altruistic. Sae was something of a 'mean
drunk', and the more alcohol she drank, the more critical and aggressive she
would become. While most people would want to avoid experiencing that, they
didn't have Makoto's masochistic tendencies.
Sae came over from the living room and sat down at the kitchen table without
Makoto having called her. Makoto sat down at the chair on the other side and
noticed Sae had already picked up the glass of gin in front of her. Makoto
watched with a small twinge of excitement as her sister began drinking.
At first they made the usual small talk, with Sae complaining about the various
difficulties that came from working in the Tokyo prosecutor's office. Makoto
was used to this litany and it soothed her conscience to hear it. After all,
she wasn't simply trying to get her hardworking older sister drunk for her own
purposes. Lashing out at Makoto was a good way for Sae to relieve the stress
she accumulated during the day, where she had to deal with condescending co-
workers, arrogant judges and hostile defense attorneys, all without losing her
cool. Makoto got up more than once to refill her sister's glass with gin. Sae,
getting more drunk by the minute, never questioned her younger sister's
actions.
Sae now began abusing this lack-wit judge that had reprimanded her after an
argument with an opposing defense attorney had started to get heated.
Apparently it was common knowledge that he pushed the entirety of his casework
onto his clerks and probably couldn't explain his reasoning behind half the
rulings he made. This signaled to Makoto that it was time to turn Sae's ire
onto herself.
"So what about those Phantom Thieves?" Makoto asked abruptly.
"...What about them?" Sae responded, frowning at her sister.
"I was just wondering if you heard any news. They're pretty popular at my
school these days." Makoto asked idly.
"I can't talk about an active case, you know that. Besides, if you have time to
fantasize about those criminals, you're not focusing on your schoolwork
enough." Sae said sharply, adopting the scolding tone she always used when it
came to Makoto's studies.
"I am!" Makoto whined, trying her best to look both defiant and guilty.
With luck, Makoto would give off the impression of someone lying on the stand.
If she succeeded, maybe it would trigger Sae's natural instinct to go in for
the kill, rhetorically speaking.
"Are you now? I hope that's what you're doing in your room all the time." Sae
said with a contemptuous look.
"O-Of course. What else would I be doing?" Makoto said nervously, not having to
fake anything this time.
"What else? Well let's see. I don't think my underwear makes for a good study
aid. So what are you really doing with it?" Sae asked angrily, her eyebrows
raised.
Makoto felt her blood run cold at the same time as she felt a tingle in her
pussy. This was impossible, Sae couldn't know. Makoto had offered to do the
laundry for both of them and had done it for months before she had stolen her
older sister's panties. Just seeing the sophisticated and sexy pairs that Sae
had worn in comparison to the simple and decidedly unsexy panties she herself
wore was enough to capture her interest at first. After that, it wasn't long
before she succumbed to the desire to put them on, then to shyly lick the area
that covered the crotch. By this time Makoto was already aware of her masochism
and overall weirdness and didn't freak out about what she was doing. But she
probably would have died before admitting it to anyone else.
"I-I...I didn't..." Makoto stammered, not having made any kind of plan for this
contingency.
"So if I look in your room right now, I won't find them?" Sae demanded,
standing up a little too quickly. A brief unsteadiness showed that the liquor
was indeed having an effect.
"Wait!" Makoto exclaimed in a panic.
If she had been thinking more clearly, Makoto would have realized she was
acting just as guilty as before, though no longer intentionally. As it was, she
could do nothing more than follow her sister's angry and somewhat unsteady
strides toward her room.
Makoto entered her room to find Sae throwing off the covers on her bed, which
unfortunately dislodged the pillow on top of them. Time seemed to slow down to
a crawl as the lacy black panties Makoto had stolen earlier fell to the floor.
Both of them looked at the panties for a moment, then looked at each other.
Makoto couldn't have said a word even if she could think of anything, so it was
Sae's pissed-off voice that broke the stillness.
"So. You're a pervert and a liar. Where are the rest of them?" Sae demanded,
crossing her arms in front of her and giving Makoto a penetrating glare.
The word pervert pierced the paralysis that Makoto was experiencing at the
moment, and she reacted completely without thinking. She brought a hand up to
rub at her pussy beneath her skirt. It took a second for her to realize what
she was doing, mostly because of the incredulous look on her sister's face.
"You're wearing them right now? Really? Get over here." Sae snapped. Her older
sister stalked over and grabbed her wrist, pulling her over to the bed.
There was a second or two where Makoto briefly considered stopping this. She
knew aikido, and though Sae did as well, the fact that one of them was drunk
and the other one was completely sober would quickly determine things. But she
decided to do nothing and let whatever happen, happen. Things were different
between them now, and only by going forward would it end up anywhere better
than it was now.
Sae had sat down on the edge of the bed and Makoto let herself be dragged over
her sister's knee. Any second now, Sae would discover that Makoto was in fact
wearing her panties. And what would happen then was anyone's guess, although
her mind did it's best to spin several versions of it, some of which she would
greatly enjoy.
Makoto felt her skirt get lifted and a waft of cool air pass over her butt. She
heard only an angry snarl before she felt Sae pulling the stolen panties down.
It didn't take a genius to figure out what was going to happen next. Makoto's
tastes ran far closer to verbal and mental masochism than physical masochism,
but she was prepared for this possibility when she let Sae pull her down.
*CRACK* *CRACK* *CRACK* *CRACK* *CRACK*
Or she thought she had been prepared. Makoto had never been spanked before in
her life. She wanted to take it stoically, but Makoto couldn't help but thrash
in her sister's grasp. Pain there was entirely novel to her and it quickly
overwhelmed her mental fortitude. But it was useless. Aikido couldn't help her
here. She had zero leverage in her position and Sae was in no mood to let her
go.
"Dad always *CRACK* let you *CRACK* get away with *CRACK* everything!" Sae
shouted, interspersing her diatribe with harsh smacks. Makoto could only sob
helplessly in response.
"You were his *CRACK* special *CRACK* little *CRACK* snowflake *CRACK* while I
had to do all the work of following in his footsteps!" Sae shouted again.
Through Makoto's tears, she could barely understand the words her sister was
saying at this point.
"And I'm still doing all the work! 60 hours a week so you can lay here and frig
yourself with my panties!" Sae hissed with a rage that was finally bubbling to
the surface.
"I'm sorry! I'm sorry!!" Makoto begged, sincerely wishing she had thought this
through more.
"You're sorry!? Not as *CRACK* sorry *CRACK* as *CRACK* you're gonna be! Now I
don't know what kind of *CRACK* useless *CRACK* pervert *CRACK* brat *CRACK*
you think you're turning into, but it ends right now!" Sae shouted once more.
Makoto nodded desperately, only really hearing the last three words.
"This is the last pair of my panties that you'll steal. These ones here!" Sae
growled as she bent forward to pick up the lacy black pair from the ground.
Makoto was so preoccupied with the pain coming from her blistered ass that
anything would have taken her by surprise. But Sae forcing the panties she was
holding into Makoto's mouth was the last thing she expected.
"I'm tired of hearing your sniveling. You wanted these? You got em. Now shut up
until I'm finished." Sae instructed, the contempt dripping from her voice.
*CRACK* *CRACK* *CRACK* *CRACK* *CRACK* *CRACK* *CRACK* *CRACK* *CRACK*
Makoto had just begun regaining her composure when Sae started the spanking up
again. It took only two smacks onto her already burning ass to drive logical
thought out of Makoto's mind completely. In such a state, crying and futilely
thrashing were the only two responses that she could grasp. Neither of which
did any good whatsoever.
 
Finally it seemed like Sae was done. Pain was no longer raining down on her
from above, and Sae wasn't saying anything either. Makoto tried to summon what
little mental energy she had left to figure out what she should do now, but Sae
solved that for her quickly. Makoto quickly found herself pushed down to the
floor.
"God, I wanted to do that for so long." Sae said with a sigh as she rubbed her
right hand.
Makoto remained on the floor. Doing anything else seemed too risky. Sae seemed
to have nothing else to say however, and quickly stalked out of the room.
 
It took about ten minutes for Makoto to pluck up the courage to follow Sae. Her
sister had retreated into her room and Makoto crept up to listen at the door.
Unless she was mistaken (and this seemed unlikely, considering how much time
Makoto spent doing this) Sae was touching herself.
Makoto took a deep breath and opened the door a crack. She peered around the
edge to see what Sae was doing. Her sister was splayed out on the queen-sized
bed in her room. Sae had stripped completely and was using a vibrator on
herself. Makoto stared at her sister's naked body, which she had never seen
before.
The sight was captivating. Sae's long silvery blonde hair was pooled around her
head. Her breasts, which Makoto had never seen clearly before, were C-cups.
Makoto's own breasts were closer to A-cups than B-cups, though for her pride's
sake she bought B-cup bras.
The vibrator Sae was using was a pink jewel-toned one that looked expensive. It
had an additional nub on top for stimulating the clitoris, and Sae was making
use of that as well. Makoto briefly wondered whether she could cut down on her
time spent masturbating if she had something like that to use.
Makoto touched herself idly and was surprised to find how wet she was. She
immediately rubbed herself harder and was making plans to cum at the same time
as her sister did when Sae opened her eyes and saw Makoto at the door.
"So you're peeping now too? I should have expected that from such a pervert.
Well, come over here." Sae instructed, waving Makoto forward.
Makoto quickly scurried over and sat down on the edge of the bed, alternating
her focus between Sae's face and her pussy. Sae's pussy was a shade less tight
and pristine than Makoto's, but then, Sae was a more mature woman. Above her
pussy was a well trimmed landing strip that matched the color of the hair on
Sae's head perfectly.
"I don't need to be wasting the batteries on this thing when you're here. Make
yourself useful for once and make me cum." Sae ordered, removing the vibrator
from her pussy.
Makoto didn't need to be told twice. This was one of her deepest fantasies and
she immediately bent down to lap at her sister's very wet pussy. Makoto had
absolutely never done this before, but she hoped her enthusiasm would make up
for it. A satisfied sigh from her sister let Makoto know she was doing the
right thing.
"You're pretty good. You must have done this before. I bet this is what you've
been doing during your 'investigations'." Sae said with a drunken laugh. Makoto
couldn't disagree without stopping, but she settled for her making an
disagreeable noise in her throat.
"Don't lie. You haven't found out anything for the principal because you're too
busy being a little pussylicker." Sae finished with a moan, settling her hand
on the back of Makoto's head.
"Maybe that can be your career. You'll be a professional cunt lapper. I bet
some of the women in Shinjuku would go for that." Sae said cruelly, getting
more and more into it.
Makoto whined and reached down to rub her pussy when Sae grabbed her wrist. Her
older sister then grabbed her other wrist and pulled Makoto's hands up to Sae's
breasts. She held them there until Makoto started to stimulate Sae's nipples.
"I think your selfish little pussy has gotten enough attention already. If you
want to touch yourself in the future, you ask my permission, got it?" Sae
growled, breathing harder than before.
Makoto gave a tiny noise of assent and redoubled her efforts at making Sae cum.
She licked all the way up and down Sae's pussy lips, then concentrated on her
clit. Makoto had the idea to alternate between swirling her tongue around Sae's
clit and using her lips to suck around it. In no time Sae was gasping and
forcing Makoto's head deeper with her hands. Makoto continued to stimulate
Sae's clit for five minutes before she felt her sister's legs closing around
her head. Sae let out a loud shriek, arched her back, and came hard. Makoto
kept licking and sucking as passionately as she could, just trying to extend
Sae's orgasm as long as possible.
After more than a minute of shrieking and writhing on the bed, Sae finally
relaxed. Makoto's head was free, and she took a moment to gulp air and collect
herself. In the time it took to do that, Makoto could see that Sae had become a
little too relaxed. Her sister appeared to have fallen asleep.
Makoto briefly considered her options, then settled on pulling a blanket over
Sae and tucking her in. She hesitated for a moment before reaching for Sae's
vibrator. Makoto did agree to ask Sae's permission before touching herself, but
considering the situation, she felt no guilt about breaking it this time one
time. Makoto would, of course, take the opportunity to thoroughly clean Sae's
vibrator with her tongue before using it.
As Makoto walked back to her room, she wondered about just how much Sae would
remember from tonight. Their relationship would be radically altered
regardless, and Makoto really couldn't guess what direction it would take. But
she could worry about that later. For now she had more immediate concerns. Like
how to masturbate with this thing when she couldn't insert it too deeply
without tearing her hymen. Or how she was going to masturbate at all when her
still-sensitive ass couldn't make contact with anything.
Oh well, Makoto would figure it out.
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!