Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/12747363.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      Multi
  Fandom:
      倉野くんちのふたご事情_(Kurano-kunchi_no_Futago_Jijou/The_twins_situation_of_the
      Kurano_family), 間宮くんちの五つ子事情_(Mamiya-kunchi_no_Itsutsugo_Jijou/The
      quintuplets_situation_of_the_Mamiya_family)
  Relationship:
      Everyone/Everyone, to_an_extent_-_Relationship
  Character:
      Kurano_Kazuya, Kurano_Izumi, Kurano_Mikoto, Kurano_Tomoka, Kurano_Yae,
      Kurano_Ema, Kurano_Sae, Kurano_Takezou, Okano_Yasuko, Takazaki_Juubee,
      Mamiya_Ryouta, Mamiya_Yakumo, Mamiya_Moeri, Mamiya_Tamane, Mamiya_Nekoto,
      Shijouin_Ririka, Mamiya_Haruna, Mamiya_Koujirou, Mamiya_Kyouka, Shirai
      Rokubee
  Additional Tags:
      Brother/Sister_Incest, Sister/Sister_Incest, Cousin_Incest, Vaginal
      Fingering, Consensual_Underage_Sex, Underage_Relationship(s), Beach_Sex,
      Beaches, Safer_Sex, Condoms, Anal_Sex, Breast_Fucking, Bedroom_Sex,
      Classroom_Sex, Non-Penetrative_Sex, Oral_Sex, Blow_Jobs, Cunnilingus,
      Outdoor_Sex, Forest_Sex, Shower_Sex, Polyfidelity, Coming_of_Age, Family
      Drama, Mother-Son_Relationship, Mother-Daughter_Relationship, Father-Son
      Relationship, Father-Daughter_Relationship, Brother-Sister_Relationships,
      Sister-Sister_Relationship, Male_Friendship, Female_Friendship, Sibling
      Love, manhood, womanhood, Motherhood, Fatherhood, Twins, quintuplets_-
      Freeform, Twincest, Rural_Setting, Vaginal_Sex, Married_Sex, Doggy_Style,
      Birthday_Sex, Gentle_Sex, Happy_Sex, Lesbian_Sex, Emotional_Sex, large
      family, Sexism, Sex_Toys, Imagination, Siblings, Love_Confessions, High
      School, Childhood_Friends, Sleepy_Sex, Teacher-Student_Relationship,
      Group_Sex, Masturbation, Bisexuality
  Stats:
      Published: 2017-11-17 Chapters: 1/? Words: 2982
****** Westermarck Bypass ******
by JohnnyMueller
Summary
     They believed themselves to be cursed, that they would be incapable
     of love. But, that wasn't exactly how things went.
     Or, a coming-of-age story/family drama that is sometimes forced by
     other people into being an incest story, but declares "Fuck off, I
     want to be a coming-of-age story/family drama!"
     Or something like that.
                               What Do You Want?
“Who do you like, Ryouta-kun?”
Ryouta looked over at Kazuya. He had found it weird to begin with that Kazuya
asked him to eat lunch separately from their usual group. Kazuya had said that
it was so Ryouta could help him find the right gift for Tomoka, but that seemed
unlikely; Kazuya knew his twin too well to need help figuring out something
like that. So, there had to be some sort of alternative motive.
“What are you talking about, Kazuya?”
Kazuya’s ever-present smile widened slightly. If there was a defining feature
about Kazuya, it was his smile. It showcased a lot of things about his
personality, of how kind, friendly, and playful he was. There was never a dull
moment if Kazuya had any say about it, which made being best friends with him
something of a difficult endeavor for Ryouta, considering his avoidant nature.
Still, he was really happy that Kazuya had been his best friend since before
they could walk, as their mothers said (which wasn’t that hard to say,
considering they lived next to each other).
“Oh, c’mon, you know what I mean. There’s a girl, or even girls, that you like
out there. I wanna know who it is.”
“Um, well…” By itself, this question would have been embarrassing for Ryouta,
but because of what his answer would have been, saying the truth would have
been social suicide.
Gotta deflect it, somehow…
“W-Well, I’m sure I got nothing compared on you!”
Kazuya raised an eyebrow. “What do you mean?”
“I bet the girl of your dreams is ten times better than mine! I want to know
who it is!” Man, I sound so stupid! Kazuya’s going to laugh his ass off!
“Um, well…” Kazuya looked down at the floor, grinding his shoe into the ground.
He was… blushing?
“Kazuya…”
“I… There are people I like, but, um…” Kazuya looked away. “I’m worried about…”
“About what?” Ryouta didn’t like his friend looking so hurt. It doesn’t look
right on him.
“That… people will hate me if I say the truth.”
… what
He couldn’t imagine anyone hating Kazuya, unless…
“What if I told you… I feel the same way?”
Kazuya looked back at him, eyes wide. “Ryouta-kun, do you…” He looked at his
bag, then got two pieces of paper and two pens out of it. He split the
materials between the two of them.
“We write the names, the actual names, on here. Then, we show them to each
other, alright?”
Ryouta looked down at the paper, then nodded. “Alright.”
With that, Kazuya Kurano and Ryouta Mamiya, with heavy hands and hearts, wrote
down those names.
“Ready?”
“Yeah.”
“Alright then, one, two, three.”
They showed the papers to each other.
On Kazuya’s was written “IZUMI, MIKOTO, TOMOKA, YAE, EMA, YASUKO.”
On Ryouta’s was written “YAKUMO, MOERI, TAMANE, NEKOTO, KYOUKA, RIRIKA.”
Neither of them were surprised, but it still took them awhile to get their
minds centered.
“Well, then.” Kazuya was the first to speak. “Looks like we’re both sister
lovers.”
Ryouta blushed. “Well, not entirely. I mean, Yasuko-san, Kyouka-nee, and
Ririka-chan aren’t our actual sisters.”
“Yeah, but they’re close enough to be considered family. And Kyouka is not only
your cousin, but your honorifics tell a different story than what you’re
saying.”
Ryouta couldn’t really respond to that, so he changed the subject. “So… what do
we do now?”
“Well, that’s a good question.” Kazuya leaned against a wall, tapping his
fingers against it. “There’s only one solution.”
“What’s that?”
Kazuya looked over at Ryouta with a grin that kind of scared him. “Polyamory.”
“W-W-What the hell are you talking about?”
“Simple. Me, nee-chan, Miko-nee, Tomo-chan, Ema-chan, Yae-chan, and Yasu-nee in
a relationship, and you, Yaku-chan, Moeri-chan, Tama-chan, Neko-chan, Kyouka-
san, and Riri-chan in another.”
Ryouta’s mind was currently on hiatus as he took this information into account.
“Bu-Bu-I-I…”
“You alright there, Ryouta?”
“U-Uh, yeah… it’s just…” Oh, how do I say it? “I’m not sure I can… handle
something like that.”
“Why not?”
“Well, um…” All Ryouta could give us a shrug.
“You know what? I’ll start it tonight, and I’ll tell you how it goes. OK?”
Kazuya’s face looked content, more than Ryouta had ever seen.
He nodded. “Yeah.”
Then his stomach growled.
“Uhh…”
“Hmm, we should probably get around to eating.”
“Y-Yeah.”
*
Dinner at the Kurano household was, as per usual, talkative.
“And then, Kumiko was freaking out because she thought she had gotten whatever
Rika-chan had, but then she said that there were just marker dots!” Mikoto
laughed. “I thought Kumiko was gonna kill her!”
Izumi sighed. “I still don’t think it was nice to do to Kumiko-san. She doesn’t
like germs and disease.”
“Yeah, but Miko-nee is right; Kumiko has been acting a little haughty lately.”
“See? Kazu-chan gets it!” Mikoto leaned over and hugged Kazuya. “Ugh, what
would I do without you to back me up?”
“Miko-nee, I can’t eat like this.” Despite his pleas, his smile told another
story.
“You know, I always wonder if high school girls are the same as when I was in
school.” Their mother sighed. “Turns out I’m not wrong.”
Ema looked up from her salmon. “What do you mean by that?”
“Oh, just that we liked to pull pranks on each other. Have you ever heard of
the ‘Red Locker’?”
Tomoka blanched a little. I don’t like where this is going.
“Well, when someone was mean to one of our friends, we made sure they knew what
we thought of them.”
Kazuya looked over. “And you did that how?”
Mom smiled. “Oh, we put pads and tampons in their shoe locker.”
Kazuya rolled his eyes. “Why am I not surprised?”
“But wouldn’t that just waste supplies?”
“Yae-chan, that school was mainly girls back in the ‘80s. You could have gotten
one by walking around the corner.”
Yae shrugged. “Fair enough.”
“You know, if it was the guys, that kind of damage control would have been much
easier.”
Izumi swallowed her food before asking their father, “What did you do?”
“Oh, we just smacked him upside the head and told him to stop being a jackass.”
Her father laughed slightly, the ponytail bouncing.
“See, that’s why we never dated boys back then. You were too simple for our
complexity.”
“You dated me, though.” Tomoka didn’t know what it was, but her father,
normally the kind of man who had trouble expressing himself, was always
straightforward with their mother.
“Yeah, I did.” She kissed him on the mouth and rubbed his goatee.
All of the siblings rolled their eyes at the behavior. Tomoka looked over at
Kazuya, and Kazuya looked back. Well, to be honest, he did more than look back.
His ever-present smile was baring a bit more of his teeth. The corners of his
mouth were higher, and his eyes… She had to look away.
I can’t think those things. I won’t get them, so why think about it?
-
She was walking back to her and Kazuya’s bedroom, having just brushed her
teeth, when she felt an odd sensation, like something was about to happen.
Ignoring it, she went in. Kazuya was lying on the bed, reading manga.
“Hey, Kazu.”
“Hey, Tomo-chan.” As she sat on a chair and brushed her hair, she let those
words seep into her. She didn’t like to pick favorites amongst her siblings,
but if she had to, she might choose her twin. Whenever she was close to him,
she felt like she was safe, safe from… everything. There was an affability in
his pose and demeanor, but more than anything, she loved that he was so open
about himself, about who he was and who he wanted to be.
More than I will even be… I want to say those words, but I can’t… I’m… too
scared he’ll never want to be with me…
“Tomo-chan.”
“Yes?”
… “I love you.”
She couldn’t help but giggle. Even though he’d never say it like that, she’d
imagine that he did. “I know that, Kazu, you didn’t have to tell me.”
She’d paid that little mind, even as the room became silent. Then she felt
someone behind her and looked up. Kazuya was staring at her, his face blank.
“I mean like that, but I also mean something more.”
She shivered slightly. “What do you mean?”
“I love you, Tomoka, like a sister. But I also love you the way Mom and Dad
love each other.”
She felt like she had stopped breathing. She couldn’t imagine him ever saying
those words; for years, she had imagined it, dreamt it, touched herself at the
thought of it. And now, with those words in the air…
I can’t believe it.
“Prove it.”
“How?”
“K-Kiss me, Kazu. Kiss me like Mom and Dad kiss.”
Without any hesitation, Kazuya held her close. She could smell him, smell his
need. Then, lifting her head up, he kissed her on the mouth. A flood of
sensations went through her. First, she felt dizzy as her legs almost gave out.
Then, a heat flowed within; she felt her nipples harden and something within
her spark. His hands were on her back, rubbing up and down. She, for her own
part, could barely move, only focusing on trying her hardest to kiss him back.
Eventually, they had to part. Tomoka still held onto him; she wasn’t sure she
could walk on her own. Kazuya seemed to notice, as he helped her over to the
bed, which both of them sat on.
“Tomo-chan, before we continue, there’s something I need to tell you.”
“O-OK.”
Kazuya’s face twitched slightly. “Well, you’re… you’re not the only girl I
love.”
Oh. She knew it, she knew there would be a catch, he didn’t just love her
alone, who would be possible of doing that, she was just leftovers
No, that won’t help me. I can’t think like that.
“Who else is there?”
“Well, there’s nee-chan, Miko-nee, Ema-chan, Yae-chan, and Yasu-nee.”
“R-Really?!”
“Y-Yeah. I… I don’t think I would be fair, though, if I just gave my love to
only one of them, so I want give it to all of them, if that’s possible.” He
held her hands in his. “Would you be OK with that?”
Tomoka didn’t need to think about it. “Yes. To be honest, I… I think I love all
of them as well.”
“Y-You do?”
“Y-Yeah. Though, I bet you love Yasuko-san just because she had big boobs.”
“Well, I won’t deny that’s part of it.”
She sighed as she leaned against him. “You pervert.”
“Yeah, but I’m your pervert.”
She affirmed. “Hey, Kazu.”
“Yeah?”
“Could you kiss me again?”
He smiled. “Of course.” He laid her on the bed so that she was on her side, and
then placed himself next to her. He placed his lips on her, only this time she
stuck his tongue into his mouth. Feeling the two struggle inside each other
made her warm up even more.
She moaned against his mouth as she rubbed herself on his leg. She felt herself
getting wet, her need quivering.
“Ka-Ka-Kazu.”
He kissed her neck. “Yeah?”
She found it hard to speak as he kissed and nibbled her neck. “Tou-Touch my
boobs.”
Without any words, he took her shirt off, revealing her body to him. She had
been seen by him before, but this was different. This had… intimacy.
He started to kiss at her breasts, with her moaning at the sensations, but not
too loudly. She didn’t want anyone else to know. He put his mouth on her left
nipple and suckled, letting his tongue swirl around it.
“A-Ah, K-K-Kazu- Mmm!” She had never felt anything like this before. She took
his hand and placed it on her other breast, letting him squeeze and feel how
firm it was.
“Hey, Tomo-chan?”
“Y-Yeah?”
“How-” he interrupted himself by kissing her breasts. “How big are you?”
“U-Uh, C-cup. Why?”
Kazuya looked up and shrugged. “Just wondering. What’s everyone else?”
“W-Well, Izumi-nee is an E, onee-chan’s a B-B,” she couldn’t really talk when
Kazuya was kissing and tickling her belly button. “Yae’s a D, and Ema’s an A,
although her bras are getting t-tight.”
“And Yasu-nee?”
Tomoka could hear his breath as he kissed and nibbled her ear. “F, I think.
What, you trying to figure out who’s better?”
“Not at all. In my opinion, all breasts are equal. I just wanted to know. After
all, if I’m going to be with all of you, I should know all that I can, right?”
“Y-Yeah, of course.” She felt a little weird about accusing him like that, but
she understood. I won’t let that determine my actions.
“Hey, Tomo-chan? Can I try something?”
“What?”
“I want to put these,” indicating two of his fingers, “inside you.”
I-I-Inside me? “W-Why?”
“Well, I heard that a girl needs to get wet before you have sex with her… or
something like that.”
“S-Sex?” She sat up, almost hitting Kazuya in the head. “You want to have sex
with me?!”
“Um, yeah.” He looked down, blushing hard. “Although if you don’t want to,
that’s fine. I shouldn’t said that, I was just… being retarded, I guess…” He
looked really sad, almost like he hurt her.
“Kazu, I do want to have sex with you. You just surprised me, that’s all. I’m
sorry if I hurt you.”
He looked up, his face almost gleaming with excitement. “Y-You do?”
“Yeah.”
Kazuya leapt and hugged her tightly. “Mmm, I’m going to make you feel so good.”
Her body warmed again. “Y-Yeah.”
They began to kiss again, though interrupted for a moment as Kazuya took his
shirt off. Tomoka admired his body; he wasn’t muscular by any means, but his
thin arms and toned stomach made her feel a certain way. She kissed his neck
and pecs, feeling Kazuya grab her breasts and butt.
“Mmm, don’t stop, Kazu…”
“You too.” As he took her sleeping pants, he put one finger on her pubic area
and started to rub it.
“Ah, ah, ahhh…” Tomoka moaned at the sensation. She felt something quiver. “P-
Put it i-i-inside, Kazu.”
“Alright. Here I go.” Kazuya, slowly, put his finger inside her. She had done
it to herself enough times before to recognize the feeling, but to have someone
else do it…
He started moving it around, dampening the bed beneath them.
“Hah, hah…” Tomoka’s arousal was beyond the point where coherent speech was
becoming difficult. She looked down and saw that Kazuya’s pants were getting
tight.
Have to… fix that… Moving her hands, she pulled down Kazuya’s pants and
unveiled… that.
She couldn’t exactly recall seeing a penis in the flesh. Sure, she’d seen them
in sex ed, and she wouldn’t be surprised if she caught a glimpse of one if she
was ever in the male side of the onsen, but this was different. It was slightly
red and was bigger than she ever imagined.
“Does… it hurt?” she asked as she rubbed herself against Kazuya, letting her
breasts press against.
“Not really.” Kazuya panted. He moved her down onto the bed.
“N-Nu-Nub…”
“What did you say?”
“Nub… Rub it…” Kazuya looked for a moment, then realized what she was talking
about and moved his thumb onto her clit.
“Like this?” He started to rub.
“Yes!” Tomoya rocked her hips back and forth against Kazuya’s hand, feeling
herself drip all over the bed. “Like… that… Mmm…” Kazuya moved his other hand
onto her breasts, rolling her nipple between his fingers.
Oh God… I’m so glad this can happen…There was a certain joy that Tomoka was
feeling that she couldn’t place, only wishing that this moment could continue
forever.
“You ready?” Tomoka could only nod. With that noticed, Kazuya moved his hand
away from her and placed his penis in preparation. Then, inch by inch, he
started to put himself in.
If what was being done before was amazing, this was ten times that. It was like
every single nerve in her body was being poked at and her skin was being placed
in a hot bath.
Eventually, he stopped putting himself into her. Then, he left and went
straight back in.
“A-A-Ah…” Her ability for coherent thought had paused for the moment. She could
only focus on the sensations. As he started to thrust back and forth into her
gently, she held him close, hearing his breath becoming heavier and his kisses
becoming harder on her shoulder.
It didn’t take too long before Tomoka felt her body reach the breaking point.
“K-K-Kaaaa-” Suddenly, she felt her entire being tighten around Kazuya, not
wanting to let him move, yet feeling even more pleasure as he did so anyway.
A little while on, she felt him throb and something enter her body with an
impact. Kazuya shuddered and he held onto her tightly.
It took them some time for them to even think about moving, so they stayed next
to each other, panting and letting the feeling last inside them.
That… that was perfection… and so satisfying.
Kazuya looked down at her and smiled, rubbing his hand in her hair.
“Did you like it?”
Tomoka nodded, unable to speak.
“Good.” He kissed her nose and got out of her, their fluids leaking onto the
sheets.
“We… have to clean up… in the morning…”
“Yeah… but that’s for tomorrow. For now, we rest.” He laid next to her and held
her close, his face next to hers. “Good night, Tomo-chan.”
“Good night, Kazu.” As she kissed and wrapped her legs around him, she was
trying to reconcile the sensations she was feeling. Noticeably, she felt
content, but not just because she was lying next to Kazuya like this. It felt
like everybody they loved was there at that moment, happy for them and waiting
to join in.
Her thoughts could trouble her another day. At this moment, she felt surrounded
by love.
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