
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11872560.
  Rating:
      Explicit
  Archive Warning:
      Graphic_Depictions_Of_Violence, Rape/Non-Con, Underage
  Category:
      F/F, F/M
  Fandom:
      Harry_Potter_-_J._K._Rowling
  Relationship:
      Bellatrix_Black_Lestrange/Narcissa_Black_Malfoy, Bellatrix_Black
      Lestrange_&_Narcissa_Black_Malfoy, Narcissa_Black_Malfoy_&_Andromeda
      Black_Tonks, Bellatrix_Black_Lestrange_&_Narcissa_Black_Malfoy_&
      Andromeda_Black_Tonks, Blackcest_-_Relationship, Cygnus_Black/Bellatrix
      Black_Lestrange, Cygnus_Black_&_Narcissa_Black_Malfoy, Cygnus_Black_&
      Bellatrix_Black_Lestrange
  Character:
      Bellatrix_Black_Lestrange, Narcissa_Black_Malfoy, Andromeda_Black_Tonks,
      Cygnus_Black_III, Cygnus_Black, Druella_Rosier_Black
  Additional Tags:
      Blackcest, Smut, Angst, Child_Abuse, Parent/Child_Incest, Sibling_Incest,
      Sister/Sister_Incest, Sisters, magical_abuse, Emotional/Psychological
      Abuse, Disowning, Alternate_Universe_-_Canon_Divergence
  Series:
      Part 1 of Toujours_Pur
  Stats:
      Published: 2017-08-21 Completed: 2017-12-20 Chapters: 2/2 Words: 1083
****** seventy-two hours ******
by julesyslushlife_(writersinthevoid), RorySanders_(writersinthevoid)
Summary
     Narcissa finds comfort in Bellatrix's bed the night after Andromeda
     is disowned. Their father finds them. Alternatively: Why Narcissa is
     such a good Occlumens.
Notes
     I played with the Black sisters' ages a little bit in this fic. Also,
     the smut is the first chapter; if you want to pretend it's just that,
     don't read the second chapter. It gets more triggering.
***** Chapter 1 *****
Chapter by julesyslushlife_(writersinthevoid)
Narcissa and Bellatrix lie tangled together in Bella’s twin bed, Narcissa’s
face pressed into Bella’s dark curls.
“I miss her,” she mutters. She wants to Banish any thoughts of the blood-
traitor from her mind, but she can’t.
“Shhhh,”Bella turns over in the bed and her hand wanders up Narcissa’s
nightgown, and Narcissa bites her lip, thrusting herself closer to her sister’s
hand. Having sex with her sister after Andromeda has been disowned is probably
not the best coping mechanism, but it does reassure her that she still has
family who loves her. And plus, it isn’t the first time at all.
Bella works a finger into Narcissa, stroking her softly and making her whine.
It’s 5AM and nobody else in the mansion is up yet. Their parents managed to
sleep fine after disowning their eldest daughter, but Narcissa climbed into
Bella’s bed in the middle of the night and clung to her, barely able to sleep.
“You still have me,” Bella says softly, pairing her soft words with fast
thrusts into her sister.
“Yeah but —” Narcissa’s protests fail, interrupted by her moans of pleasure as
she closes her eyes. She doesn’t particularly care about being quiet — their
parents have wards to avoid too much noise entering their room, and she feels
that there’s some sort of justice in being so loud with their celebration of
sisterhood after Andromeda has been disowned. And frankly? This has been going
on for years, Narcissa’s pretty sure her parents know about her and Bella by
now. What would two women from the “Toujours Pur” House of Black sharing a bed
at their age do other than this, anyway?
“My little sister,” Bellatrix kisses Narcissa’s pale neck, causing Narcissa to
make quiet noises of contentment. “All mine,” she whispers before she seals
Narcissa’s lips in a passionate kiss, while still having a finger inside of
her.
And then the door clicks open.
Bellatrix removes the finger from her sister and jumps up, not even bothering
to pull the covers over her naked body. Narcissa just lies there, paralyzed,
with her hair and nightgown a mess.
“Get dressed silentlyand come downstairs,” is all Cygnus Black says, commanding
the sisters with an order that he knows will be magically enforced with pain if
they don’t follow it fast enough.
***** The White Room *****
Chapter by RorySanders_(writersinthevoid)
Narcissa and Bellatrix dress hurriedly, pulling on their robes. When they are
both dressed, Bellatrix moves to head out of the door, but Narcissa puts a hand
on her older sister’s shoulder, looking up at her with a pleading expression
and mouthing “What will happen?”
“Don’t think about it, Cissy. That just makes it worse. And it will be worse
for me, anyway,” Bellatrix responds, mouthing back at her. In times like these,
and when in solitude at Hogwarts, they’ve perfected the skill of talking
without speaking.
They hurry downstairs, and present themselves in the sitting room of the
mansion like the dignified ladies they are. Cygnus storms into the room. He
doesn’t say anything, just grabs Bellatrix’s wrist and pulls her up from the
chair in a way that Narcissa knows will leave bruises.
As he pulls Bellatrix away, Narcissa realizes with a sinking feeling in her
stomach that she knows exactly what is happening. It’s happened before, but
with the betrayal of Andromeda fresh in their father’s mind, Narcissa knows it
will be much worse than usual.
Her suspicions are confirmed when there’s the painful snap in her mind that she
knows so well, despite it only having happened a handful of times. It feels
like a part of her is  gone,  her magic out of balance and reeling, desperate
to feel some presence of Bellatrix’s. But it’s not there. He’s taken Bellatrix
to the white room.
***
The worst part of the white room is when she feels her father’s magic and no-
one else’s, Bellatrix thinks as she is dragged there. When he hits her
downstairs or casts gratuitous curses on her in her room so she can practice
her resistance to the Dark Arts, even when he comes into her room late at night
and claims her in a way that only Narcissa or her future husband should be able
to, she can feel the family magic put up some of a fight and her bond with
Narcissa surround her.
But in the white room, all of that’s gone.
“You are  disgusting,”  he says, pushing her up against the mattress - oh no -
that is inside the room. “Your sister has betrayed the family by tainting
herself with the hands of a Mudblood, and now you have attempted to seduce the
only pure child of mine by showing her something that she should only have from
her husband. What do you have to say for yourself?”
Bellatrix has done this before, and she knows that apologizing won’t do
anything. In times like these, her father thinks she is the devil incarnate,
the doom of the Noble and Most Ancient House of Black. She also knows that he
is doubtless aware of what she and Narcissa do behind closed doors, but if he
wants to make a fuss about it this time, fine. It’ll be over soon, anyway.
Probably not tonight, judging by the mattress, but soon. He can’t keep her in
this room for too long without breaking both her and his only pure daughter.
“ Crucio,”  he hisses, and Bellatrix’s body comes alive with pain. She focuses
on it, because it’s actual magical sensation, and if she’s not going to be free
from this prison until tomorrow she needs as much of that as that as she can.
Bellatrix wraps her mind around the magic of the curse, pulling it towards
herself and holding it almost like a protective shield so even if she is in
worse pain, what happens next feels less mundane and like she is disgusting.
What happens next is that he Vanishes her clothes and forces her legs apart
with a knee, and then lowers himself down to fuck her like she’s some worthless
object.
“Maybe  this  will teach you what sex is supposed to feel like,” he grunts,
coming inside her. Bellatrix maintains a carefully neutral expression, but
inside she’s laughing. This is just a pathetic excuse for her father to father
to use her like the magic of his marriage bond forbids him from using her
mother. Being violated by Cygnus feels like pain and erosion of everything that
is natural. Making love to her sister feels like heaven and honey.
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