Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/6094240.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/F
  Fandom:
      RWBY
  Relationship:
      Ruby_Rose/Yang_Xiao_Long
  Character:
      Ruby_Rose, Yang_Xiao_Long
  Additional Tags:
      Animal_Transformation, Mildly_Dubious_Consent, Sibling_Incest, Incest,
      Half-Sibling_Incest, Sister-Sister_Relationship, Sister/Sister_Incest,
      Pheromones, Grinding
  Collections:
      Incest_Stuff, Stories_About_Incest
  Stats:
      Published: 2016-02-23 Completed: 2017-11-02 Chapters: 3/3 Words: 3572
****** Half-Monster ******
by NaughtyButWeiss_(RWBYRemnants)
Summary
     For a while now, Yang has been noticing her rage takes longer and
     longer to fade when she goes into berserker mode. One day, it finally
     becomes clear that it's more than just on the inside. [nsfw, Enabler/
     inc3st; complete]
Notes
     by: NaughtyButWeisss
     ship: Enabler (Ruby/Yang)
     universe: canon divergence, mosnter!Yang
     WARNINGS: Incest, almost-dubcon
     Thinking about doing more with this, but dunno yet. We'll see.
***** Chapter 1 *****
The urges had finally taken over Yang Xiao Long's body. Every time her anger
overflowed, she felt them building, but always managed to fight them down. Not
tonight. They burned and burned and burned, and she knew something was wrong
but didn't care, couldn't stop it. Ever since Blake had been injured by the
White Fang, she hadn't been able to keep a lid on it... and now the rage
finally had taken over completely. Her eyes flamed and her hair and skin gave
off sunlight as she destroyed the heavy bag, as she stomped back to her room.
She didn't know what she was going to do, but she knew she had to move, had to
keep going.
Ruby Rose seemed surprised when she walked in, startled. Fearful. She wanted to
attack her for displaying so much fear - but she fought that down, ignored
that. She was saying something about her looking different. "Horns." It sounded
ridiculous, she could barely understand her through the curtain of rage. Why
would she have horns now when she never did before? Complete nonsense.
Then she scented it on the air - something full, rich, alluring. What she
smelled from Blake on occasion. Was she back from the hospital, waiting for
her? Immediately, her desire flamed to the surface and her head swivelled to
and fro, looking for the source of that intoxicating aroma. No one was in the
room but her half-sister.
And then she saw the colour in Ruby's cheeks. No.
Yang was suddenly even more angry than before. Her little sister wasn't allowed
to do that, wasn't allowed to feel those feelings! Especially if someone else
was causing them; she wasn't ready for that.
Suddenly, she was pinning Ruby to her bed by her wrists, smelling her hand
while she squealed and tried to push the larger girl off. Her voice was a growl
when she demanded to know what Ruby had been doing before she came in. That
look of shame was coupled with another flare of the scent, and both Yang's
primal rage and her desire were redoubled. She could not hide her indiscretion
- and Yang could not hide her hunger.
As her mouth hung open, panting, she demanded to know what man made her body
feel that way. Ruby didn't answer, but she did reach up to tug at something
above Yang's head. She felt it dip forward - there were horns, it seemed. Being
grabbed by them made her slam her hips down against Ruby's, and she heard the
girl groan... but it wasn't a groan of pain.
Her mind was a fog as she slid down toward Ruby's skirt, jerked it up roughly.
Ruby was protesting in the background, saying something, but the blood rushing
in her ears blocked it out. The stronger scent was calling to her, and she
pressed her face into her cotton panties. The gasp from above was muted, and
repeated itself when she began to rub her lips against the damp stretch of
cloth, picking up vague hints on her palate of her sister's essence until she
could bear it no more. Her hand wandered up, hooked on the waistband-
And then she felt a firm grip pulling her head up and away from what she
wanted. Ruby's silvery eyes were full of tears and more were falling.
Finally, Yang's heat-hazed vision cleared. Her senses came back to her, and her
eyes returned to normal, and she was left with a sobbing, panting Ruby who was
staring at her as if she didn't know her anymore. The memory of what she had
just done seemed like a bad dream, so indistinct were the impressions... but
the proof was right in front of her. She could still catch Ruby on the air,
still taste her on her lips. This was the worst thing she could ever have done.
The words "I'm sorry" weren't enough, but she offered them anyway. As Ruby's
hands slipped off her horns, she nodded, but she was still flushed completely
red as she quietly cried.
"Can... I be alone... for a little while? I..."
The smell was growing stronger instead of weaker. All Yang did was lay her hand
on Ruby's thigh, and she let out a shaky breath. She nodded, but when she
leaned in to peck her on the cheek, her lips found her mouth instead. Another
whisper of "I'm sorry," but Ruby's lips finding hers cut it off, even as her
hands were pushing Yang away. Then Yang gripped Ruby's upper arms - hard, maybe
bruising - as she kissed back, to keep them from breaking apart. The fist in
her chest made her pull away, fling herself off the bed entirely and onto the
floor.
"I'm not a monster," was the first thing out of her mouth. What a lie. Only a
monster would do this. Would hurt Ruby this way, would let the heat that
normally boiled under the surface take over, and do the one thing that she
could never take back. To her sister.
"You're not a monster," Ruby affirmed - and it felt both like a knife twisting
in her gut, and like a warm, soothing salve. Ruby should hate her, had every
right... but she didn't. She was just too pure inside to be capable of that.
"Yang... I love you, okay?"
The words caused a reaction they never had before: desire. The wrong kind of
pleasure.
Yang ran from the room as fast as her legs would carry her, not caring what she
hurt, who she bumped into. She just had to get away. Monsters couldn't stay at
Beacon.
***** Chapter 2 *****
Chapter Notes
     Surprise! Decided to do something with this after all. I was gonna do
     it to post on Halloween but couldn't quite get it finished. There's
     only gonna be 3 chapters, but I always felt it deserved to have an
     actual ending. Hope you enjoy!
=Chapter 2
There was no way for her to know how many days had passed since she fled into
the Emerald Forest. Weeks? Months? Her mind had fled her. She wished she could
remember what she had eaten when the brief flashes of sentience came back to
her. Or where she was, other than the woods; every tree was familiar and yet
unfamiliar. She could be anywhere in the world and it wouldn’t matter.
When Ruby found her, she was feasting on the corpse of some woodland animal or
another. It smelled like food; that was all that was important. Sustenance.
Survival. Ruby was sustenance to her in one way.
“Yang?” she breathed fearfully. “I… wh-what are you eating?”
A snarl ripped from Yang’s throat that actually surprised her own self. But she
made herself stop caring about that and turned back to the meal. It had been
hard work to hunt down and kill this, and she had to finish it off before
another beast came along and challenged her for the-
“It looks good! Can, um, can I have some?”
Something about that didn’t sound right. Her head raised up and she blinked at
her sister, trying to remember why. It wasn’t registering. The fear and nausea
was evident in the sweet young woman’s pale face; that was it. That was why her
words were so out of place.
There was something she used to do when other people talked to her. What was
it?
“Well… I wanted to just come see where you’re living now. Comfy out here?”
Talk. She used to talk when someone talked to her. Lips pulled back past teeth,
her fangs dripped with blood and saliva… she growled again. It wasn’t talking,
or even close to talking; it was a noise that she used to ward off other
predators. Ruby was always better at that than she was, even before the change.
But now she didn’t want to talk, or do anything else. Just to eat, to drive
Ruby away. Before she had to do something about the intruder to her territory.
“S-so Yang,” she went on, hands in the small of her back as she paced forward
nervously — too nervously, too afraid, the fear smelled tempting — “Weiss and
Blake wanted me to tell you that… that we all miss you. And me, too!
Obviously.”
Yang stared at her with her wide red eyes. She only knew they were red from
when she drank at the pond. They used to be another colour, too…
A hand approached her hair, and she leapt away, snarling and raising a hand,
fingers now sporting claws at the tips. Flashed in Ruby’s direction, making her
draw the hand back… except she didn’t. Hesitated, yes, but didn’t withdraw
entirely. The hand kept going, slower than before, and Yang was able to
suppress her instinct to flee or to attack. She knew Ruby; her scent was
familiar, her face was familiar.
“It’s okay,” she whispered as she caressed over Yang’s lank, greasy hair. “I’m
here. I’m your sister.”
Somehow, she couldn’t help leaning into the touch. There was a slight smile on
Ruby’s face, and it got wider when Yang crawled on top of her, nuzzling into
her neck and causing her to giggle. Arms wrapped around her back, and she
bristled, readied to flee, but the embrace was warm instead of restrictive. She
licked her-
That did cause another reaction. Ruby shivered, let out a soft sigh. Desires
flared back into Yang’s body that she had long since abandoned, buried and left
dead. On purpose. This was why she was here: to give herself over to her new
life as a monster and to forget the one thing that would make her worse than
one.
“Yang…”
Her hips began to slam down into Ruby’s, and she let out a sharp squeak
followed by a long groan. It was encouraging. However, after a few more rolls
of her pelvis, she felt tugging on her horns, and her head was wrenched to one
side. She snarled, but when she saw serious silver eyes staring down into her
own, she stilled, waiting to see what would happen.
“Yang, come back to me. Please? I… I need you.”
Those words broke over her. She wanted to take them at face value, to tear
Ruby’s stupid cloth-leaves- wait, the word for that was clothes. Tear her
clothes off with her teeth and claws, devour her in one way or another. But
that wasn’t what Ruby meant, and she could feel the truth in them, and feel
something within her mind stirring.
“I know you’re in there!” she hissed, voice pleading as she hung onto Yang’s
horn despite her beginning to struggle against it, to try throwing her off so
she could move as she wished. “Everybody at Beacon misses you! Dad’s asking if
I’ve seen you, they’re trying to make me send your stuff back to our house… but
I don’t want to lose you! I think you’re still in there and you can come back
to us, if you j-just… just forgive yourself!”
The last part really did throw her for a loop. Forgive herself? Ah. For the
thing which she was trying to forget about entirely. For nearly hurting her
sister. The reason for her flight into the forest. She looked away, panting and
her vision swimming.
“Hey, your eyes are turning purple again.” When she glanced back up, Ruby was
smiling. “Can you say my name? Can you speak?”
It took an effort of will. Her lips opened and she growled. But after a moment,
the growl turned into “Ru… by.”
***** Chapter 3 *****
=Chapter 3
Yang was as shocked as Ruby was to hear her speak. However, unlike Yang, Ruby
was ecstatic. “That’s good!” she cried out, throwing her arms around Yang’s
neck. She bucked and tried to throw her off, but she held fast, giggling and
kissing all over her face. “Yang, I knew you could do it!”
Her animal nature tried to reassert itself. Hind legs braced, launched them
both into the bushes and pinned Ruby hard against the leaves, prompting a grunt
from her as she was pinned. Her fangs raked along her willowy neck, but Ruby
didn’t scream or try to push her away; she only held perfectly still. Somehow,
that made Yang kiss her neck instead of trying to bite it, instead of trying to
attack. Another sigh of gratitude.
“So… I thought about this part,” Ruby whispered into her hair. “And… if th-this
is what you need to come back… then we…” It took her another minute of Yang
lapping at her neck, down to her collarbone, before she could finish her
thought. “You can have me. I promise, Yang, if you can be my sister again, and
mess with Weiss, and make puns, a-and tease me and Blake, and… you can do
whatever you want with me!”
Tongue lolling out, she drew back and fixed Ruby with hungry eyes. That sounded
good to her. She knew deep down that something wasn’t right about this, that
she shouldn’t do anything more, but she only wanted to be with Ruby more than
anything else in that moment. The instinct was overwhelming.
Teeth raked down and began to shred Ruby’s bodice, her claws doing the same.
Her sister shivered and did let out a shriek at that, and her hands came up to
fist in Yang’s hair as a way of bracing herself. That only spurred her on.
Again, she found herself facing Ruby’s underwear, though it was stretched over
her upper body instead of lower body this time. Her tongue lolled out and slid
from navel to the center clasp, fangs slid back and forth over the fabric…
“Good,” Ruby whispered fearfully, shaking all over. “It’s… it’s what you need…”
Her mind sharpened just enough to remember why this was not what she wanted.
Only for a moment, but she remembered, and she tried to throw herself off to
run away.
“NOPE!” Ruby shouted, grabbing onto her horns. She dragged the smaller girl
several yards before the pain on her neck forced her to slow down and collapse
to the ground. “Yang, y-you can have me, or you don’t have to, but… but I can’t
let you go again!”
Her throat worked and she finally managed to growl, “Nnnno! Ruby… go!”
“Please, don’t do this!”
“I’m… too…” The word wouldn’t come to her. She didn’t care about words anymore.
Maybe she could remember every single one Ruby was saying, what they meant,
understood them. But she didn’t have any interest in saying them herself.
“You’re my sister and I love you!”
Teeth gnashing, she ground out, “I’m… a monster!”
“I don’t care! Maybe you are, maybe you’re not, it’s- you’re my sister and th-
that’s that!”
Tears were leaking down her cheeks now. She tried to run, but the hands held
fast, and her throat erupted into a howl that made Ruby duck her head. Yet her
hands remained clamped around her horns, dragging her down on top of her soft,
pink body and the shreds of red-and-black clothing that still hung gaping open,
distressed by her own actions.
“Ruby… I love…” The encouragement to speak wasn’t helping, was making the words
come faster despite how badly she wished they wouldn’t. “Want you… smell you,
taste… it’s bad, monster, hunger is wrong…”
Again, Ruby forced her head back and stared straight into her eyes. Her voice
was deadly serious. “Then take me. Whatever you want. Just don’t leave.”
“No… nnnno…” Why was it so tempting? Because she could scent Ruby’s arousal on
the air. Because her body was strong, but soft, vulnerable. Her teeth raked
down Ruby’s neck and chest once she was released, but she also started kissing
the skin here and there again. “Ruby…”
“Come back with me. We… could help you, I think…”
“Why? Why do you want… me to…”
When Yang sank her teeth into Ruby’s thigh, she called her name, loud and
piercing. The scent only grew stronger. How could she hold back after that? Her
mouth closed around the softness through the underwear, and even while Ruby’s
voice hitched above her, she felt her own hunger growing stronger. She needed
her sister then and there. Need throbbed between her own thighs that she wanted
to sate, but it was more important she devour first.
When she yanked the cloth aside to taste her directly, Ruby did cry out again.
“Yang, no!” But when Yang froze, a hand fell to her hair and stroked. “I m-
mean… I… I’m scared, but… if you want me…”
“Want you.”
“Please take me, then.”
She was sweet, and salty, and thrumming with a very mild taste that drove her
even more wild than she already was. Her work was so voracious but she found
herself able to resist biting down; she wanted her sister to love what she was
doing, too. Which was as shocking as wanting to do it herself. Very little time
had passed before she felt Ruby convulsing, squeaking into a closed fist to
muffle her cries of ecstasy. She hadn’t expected it to happen that fast. She
kept up her motions until Ruby had stopped completely, then raised her head to
stare at her, panting.
“Good? For you?”
“Good,” Ruby agreed with a breathy little laugh. Her red-and-black hair was
plastered to her forehead, and her eyes half-closed. “Did you, um… was I tasty?
I don’t really know what I’m asking…”
“Very good. I need…”
Surprising both of them, Yang crawled onto her and began to grind her hips
against Ruby’s soft thigh. The girl yelped, then giggled a little. “Yang,
you’re worse than Zwei!” But Yang was too single-minded in her pursuit of
pleasure to take that in. “Oooh… I can feel you, so warm and wet…”
It didn’t take her long, either. Never would she have predicted she’d rut
against her own sister’s leg to bring herself to climax, but Ruby stayed
beneath her, sharing kisses and stroking along her nude back. Within minutes,
she was howling into the branches above.
“Oh my God, Yang,” she whispered as she fell limp atop her. “We did it. I
think? Yeah, that really feels like…” After gulping, she wrapped her arms more
tightly around her. “And it’s okay! I mean, it’s weird, but I… I’m happy. I got
to spend time with you.”
“I’m happy, too,” she breathed, snuggling down against her. “Even if you did
compare me to Zwei.”
They both drew back and gaped at each other. After a few seconds, Ruby
whispered, “You sound like you again!”
“What? I mean, uhh… I do.” She blinked a few times, then shook her head
violently. “It’s… I still feel… angry, and strange… hard to think sometimes.
But like, I think I’m back. Kind of.”
“Where did you go to come back from?” Ruby asked, very much needing to know.
“I was… so angry. About Blake.” She raised her hackles to think about it again,
but Ruby kissed her cheek and she was able to let the feeling fade. “And… and
then I came in, and you had been getting yourself off… and it was like, my
anger focused on that… which was stupid. A-and when we started turning each
other on, and I almost hurt you, I just… couldn’t…”
This time, Yang did start to change again, more fully. She backed away from
Ruby, shaking out her head, the voice of her sister fading to just noise. But
firm hands grasping her horns brought her around.
“…not that bad,” Ruby was saying when she could understand her again. “I love
you.”
“Love? Me?” Then she shivered, trying to find that place she had reclaimed
again. “I m-mean… yeah, I love you, too. Sorry. I’m so sorry, Ruby!”
As she sobbed into her sister’s shoulder, Ruby started whispering, “We’ll talk
to Ozpin. He can help. But even if he can’t… I’m not going anywhere. I love you
so much, sis! And… and doing it with you felt great, so please don’t think I
was just, like… ‘putting up with it’ or whatever!”
“Really? You wouldn’t rather do it with someone who’s not your… y-your own-”
“Nope!” she headed her off, which helped to keep her soul in place. “But I do
think maybe we should, like… try to take some time off doing that. See if it’s
what we really want. And if we do, well, I think we’ll be okay. Because that
was a lot of fun.”
At last, Yang leaned up and waggled her eyebrows a little more like her old
self would have. “You bet it was. Didn’t figure you for a screamer.” At Ruby’s
amazingly pretty blush, she felt a little warmth creeping into her own face.
“Wow… this is really messed up.”
“Yeah. But… I got my sister back, and finally got laid! Everything else is just
dumb details.”
“Guess so.” As they finally stood, Yang put her hands on her bare hips. “Gonna
be pretty embarrassing to walk back into Beacon naked, though.”
“I could loan you some of my clothes, but you kinda fucked them up.” When Yang
sighed, she giggled. “But it’s okay. You’re not a monster anymore, and that’s
way more important than a pair of panties.”
“I’m half-monster,” Yang corrected, tapping her horns. “Seriously, I’d love to
hear Ozpin or Goodwitch explain where these came from…”
“Tomorrow,” Ruby said sweetly as she put her hand into her sister’s and they
began to walk through the Emerald Forest and back toward the school. “Tonight,
let’s just get back home so you can take a shower, stinky half-monster.”
Yang’s grin was still a little vicious, but mostly just lewd. “As long as you
shower with me.”
“YANG!”
                                    THE END
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