"I have a surprise for you," Junko said, stroking Mukuro’s arm.
It was strange how so few words were required to twist her insides with both anxiety and anticipation.
"I’m taking you on a trip."
Mukuro sat uncomfortably in the airline chair, her knees pressed against the reclined seat in front of her hard enough to etch the texture of the upholstery into her skin.
"How despair-inducing," Junko said. She gently patted Mukuro’s thigh, just above her bruising knees. To the older twin’s surprise, the hand didn’t travel up toward the hem of her skirt. She was somewhat disappointed.
"Is that why you booked us coach?"
"Flying coach is the closest one can come to true despair without dying." Junko turned to look out the window.
The violent shudder that ran through the airplane interrupted Mukuro’s comment about the quality of her sister’s joke. Oxygen masks popped out of the compartment above them, and the captain’s voice came over the radio instructing everyone to assume the crash position.
In shock, Mukuro glanced to her left, where Junko was staring at her through half-lidded eyes and a wide, toothy grin.
"Surprise~!"
"You aren’t serious," Mukuro said, frantically grasping for the pamphlet with the instructions on what to do in a crash.
"Nee-chan, calm down," Junko said. She gently but firmly pushed Mukuro back upright and snuggled into her side. "It’ll all be over soon."
"Junko-chan…"
"Shhh, just enjoy it." She took Mukuro’s left arm by the wrist and wound it around her torso. Her right arm reached across Mukuro’s stomach and linked fingers with her sister’s tattooed hand.
Instinctively, Mukuro pulled Junko close and rested her chin on the top of her head. She couldn’t see anything outside the window but black smoke.
"You’ve really outdone yourself this time," she said, kissing her sister’s skull. Her bleached hair tasted like chemicals.
"I know." Junko’s body vibrated against Mukuro’s as she chuckled. Her thumb slowly stroked the palm of Mukuro’s right hand.
"You do realize that it’s uncommon to die in a commercial airline crash, right?"
"Of course I do. I love you, Mukuro-nee, but you haven’t been that good.”

You know, I’m glad Komaru exists. It’ll be nice to have a healthy, cute sibling relationship to balance out…all this.
*waves hand in general direction of “all this”*
(all this.png)

Haha, imagine Mukuro being all self-conscious about wearing military uniforms/clothing around Junko because it drives her crazy with lust. Mukuro thinks this is because the clothes are masculine and tells herself that Junko is pretending that she’s someone male.
Meanwhile, Junko has developed a full-on fetish for military outfits. Mukuro left her behind to join Fenrir, which was a sort of Despair Milestone in her life; the memory of it alone can sometimes set her off. Since she equates military with despair on some level, even just the superficial aspects of the military can arouse her.

Mmm. I bet (on more than one occasion) Junko had Mukuro take out a handgun, show her that the clip was full and the safety off, and hold it in front of her lap. Then, Junko would push her against a wall and clap her hands over her sister’s so she couldn’t drop the gun, pressing the grip into Mukuro’s crotch, and proceed to deep throat the barrel.
Because Junko’s thumb is wedged into the guard, Mukuro’s index finger has nowhere to move except to pull the trigger.

id=38732810

Hollow
Pairing: Despaircest (Enoshima Junko/Ikusaba Mukuro)
Rating: Mature (blood, gore, bad words, incest, the usual stuff)
She’s a machine, that’s all. She doesn’t think, she doesn’t feel, unless her sister wants her to.
What will you do once you’ve destroyed everything?
_________________________________________________________
“What will you do once you’ve destroyed everything?”
The words hang in the air for a brief moment and then fall flat.
Ikusaba Mukuro slouches forward in her seat, twirling her pencil thoughfully between her thumb and forefinger. Her eyes flicker to meet Enoshima Junko’s before focusing back on the pencil.
A long pause.
Junko raps her nails against the table in annoyance.
"What a stupid, stupid question," Junko finally answers, watching her sister wince slightly at the sharp reply. "Do you know how long it would take to do that? A long, long fuckin’ time, sis! We’re talking centuries- millennials even!"
She laughs and it’s knifelike; piercing and painful and so very loud.
"You said you wanted to send the world into despair," Mukuro pauses to meet her sisters gaze. "Wouldn’t that involve destroying it as well?"
Junko clicks her tongue and contorts her face into a grimace.
"Ugh, how barbaric," She wrinkles her nose in disgust at the very thought. "Though I’m not suprised to hear that from someone like you. You mercenaries think the only way to cause despair is by blowing things up and killing people."
"That isn’t true at all-"
"Shut- the- hell- up- you stupid fucking clod." Her voice is frozen, viperous. Her eyes narrow and the soldier feels them bore into her skull, as cancerous as ultraviolet rays.
Mukuro’s lips snap shut.
The strawberry blonde closes her eyes and rubs her temples feverishly. She lets out a sigh of disappointment.
"This is why I am the brains of this whole plan," Junko folds her arms and leans back in her seat. "And you are the walking knot of muscles that does only what I tell it to. You don’t think in any of this, everything you say, do, or feel is commanded by me, Enoshima Junko-chan~!” Her voice rises at the last syllable. She brings her wrists up to her chin and winks, as if she was posing for a photo shoot. Her expression changes quickly, her gaze is cold again, her eyebrows lowered, her eyes stabbing into her, accusing her. “Got it, sis?”
So cruel. Something inside her thinks. So terribly cruel.
The sound of her voice, it stings the soldier, but not sharply. No, it feels like pressing hard into a fresh bruise. The pain is low and long and sore. But it still stings her, the dark, callous soldier who could watch the light leave your eyes and feel absolutely nothing. But Junko stings her, Junko hurts her, Junko rips her to pieces and she slumps her shoulders and nods her head every time.
"Yes." She must have said at some point, but she doesn’t recognize her own voice.
"Good," Her sister gets up and checks her cellphone. "I’m going out to a party. I might bring someone back, so don’t bother us."
"Okay." The sound in her throat feels so foreign.
Junko embraces her and Mukuro’s hands slowly find her sister’s waist.
"I love you, sis." The model whispers into her ear.
"I love you too, Junko."
"I love you so very much." Junko’s breath is hot against her.
Mukuro stills as she feels her sister’s teeth scrape lightly along her right ear, playfully nipping around it before finally biting down and tugging on the soft flesh. Her heartbeat doubles its pace.
"Junko-"
"Stupid, stupid sister." She hears her mumble aganst her neck before her thin lips are greeted with her sister’s bright, pink ones. She’s warm, so warm and Mukuro wants to melt when she feels her sister’s tongue run across the divots of her teeth. She feels her teeth dig and pull at her lips, a noise escapes her throat and she feels the low burning in her loins.
Junko pulls away instantly, wiping the corner of her mouth with her thumb.
"You smeared my lip gloss." She says blankly.
"I’m sorry." Mukuro mumbles in confusion. Her head is still spinning, just seconds ago her sister’s tongue was almost down her throat and before she can process anything, she hears the front door close.
Junko, how can you like this feeling? This despair.
-
"Um, wow, uh- hey there!" Someone says to her, but she wasn’t really paying too much attention.
She’s been sipping her drink, the party is lame shit. Everyone has been bugging her, asking her for her name, her phone number. It’s annoying. She just wanted to go to find a nice screw, really. She checks her phone again, she’s so bored she could die.
At least I’m buzzed.
She feels a tap on her shoulder and she turns.
"Hey there!" The voice belongs to a moderately attractive man, around her age, thick curly brown hair, freckles painted across his face; she has a thing for freckles, no idea where it came from though.
"Hi." She stuffs her phone back into her bra.
"I just noticed you from across the room, you looks stunning, really! Can I get you a dr-"
"If you want to fuck me we can just go back to my place. I don’t really have time for this useless small talk, it’s boring and quite frankly, a waste of my valuable time."
"Oh I uh-"
“Christ- just come with me.” Her fingers curl around his wrist and she leads him out the door.
-
Mukuro had just changed into her pajamas when she hears the front door open.
She peeks quietly through the crack of her door, being incredibly careful not to make a noise.
As soon as the door shuts behind Junko and the man, she strips off his shirt, kissing him violently, her fingers mussing his hair. Mukuro’s expression doesn’t change but she feels the emotions stir inside her. She knows Junko is up to something. She continues peeking through the crack to make sure.
"My room’s over here." She giggles, leading him into her room before shutting the door quickly.
Mukuro is surprised the man is so attractive, he is a lot better looking than the men Junko usually brings home. She sneaks slowly out of her room to Junko’s door, pressing her ear firmly against it.

"Be gentle now~!" Junko teases, pushing him onto her bed.
"O-of course I will. Gosh, you’re gorgeous." He stutters as he watches her strip off her shirt and tie, throwing them on the floor. The rest of her clothes following shortly after.
"Don’t be too loud," She coos, "My sister is sleeping~!"
"You have a sister?"
"Yeah, we fuck sometimes."
"Whoa, that’s- whoa.”
"Yeah it’s pretty hot- what are you waiting for? Put it in already!"
Mukuro removes her ear from the door, her face a dark crimson. Did Junko really just say that? To a complete stranger? How many people has she told that to?
His moans echoe throughout the room, in a few moments it becomes a yell, and then-
A shrill scream rings throughout the house.
Mukuro bursts into the room with full force and freezes at the scene-
Her sweet little sister
straddling the young man
but the sheets are soaked in red.
Junko smiles again as she
plunges the knife into his chest
twisting it
cracking through his sternum
piercing his heart.
She looks into his eyes
tilting up his chin
watching the light leave him.
The despair, there is so much despair.
She stabs him again and again and again until- until she hears a noise and turns.
"You," Her face is spattered with blood, her hands painted ruby red and still gripping the knife. "I told you not to bother us." She grinned, looking down at gored husk of a man.
"Junko- why did you-"
"Because I can, Muku-chan~!” She dismounts him and slips off the bed, the knife still in her hands. “Don’t you get it? I have the world in the fuckin’ palm of my hand!”
The soldier finds herself speechless as her sister stands before her, naked and covered in blood.
Junko shivers and her grip tightens around the blade, a large smile creeping up her face, the saliva dripping off of her chin.
"A world- rotting in despair- all by my hands-" Her voice hitches as her body begans to shake from the pleasure, the blush rising in her face. "My h-h-hands. But, it’s still, not enough." Her eyes fix to meet her sister’s.
"Junko, I’m going to help you with this. I’ll help you bring the world to despair." Mukuro’s voice is calm but the adrenaline is pumping inside of her, she’s never seen her sister like this, not to this extent. It terrifies her. It arouses her.
"I need more, Mukuro. More, more, more despair-inducing despair!” Junko steps toward her, her grin growing wider, “Ah~!I have a great idea, sis!”
"What is it, Junko?" The soldier replies cautiously. "What’s your idea?"
"I’ll destroy everything, just like you mentioned before. I’ll destroy everything I love. My friends, my family, my lovers, everything."
"Junko-"
"Starting with what I love the very, very most…" Her eyes glare into her sister’s, that icy blue, so cold, everything feels so cold to her, frozen solid.
"Junko, put down the knife."
"Why Muku-chan~?" She pouts playfully. "Do you not trust your little sister?"
"Not when your like this. Put it down."
The knife hits the floor with a clatter, Junko hangs her head.
"You don’t trust me. Heh, how despairing…" She whispers, low and raspy. "I was just joking, of course."
"Of course." Mukuro repeats, trying to believe herself, trying to believe that her sister would never even dream of killing her.
"I love you so much." Junko murmurs, drawing herself close to her sister. Mukuro’s eyes scan slowly down her body, the burning feeling in her stomach rising. "You like what you see?" Her eyes lower.
Junko kisses her and she can taste the copper tang of the blood and she wants to gag, she wants to vomit, but her sister’s hand holds her chin in place and she can’t escape, no, she doesn’t want to escape, but it’s still so repulsive, so vile. Junko grips her shoulders, leaving sticky, red hand prints on her.
"I want you to give me so much despair." The blonde exhales against her.
"I will Junko, I promise. But first-"
"Hm?"
"Let’s dispose of the body."
Junko smiles wide and Mukuro returns it weakly.
She still feels so empty, so hollow, like a scraped out shell. Her world, her life, her dreams are all for Junko. She’s a machine, that’s all. She doesn’t think, she doesn’t feel, unless her sister wants her to.
But if she can bring her sister despair, maybe she’ll feel the bliss of it too, maybe she’ll at least feel something.
Then maybe, Junko will actually love her like she says she does.
Maybe.

Junko x Mukuro - boring
an adaption of a roleplay with eppiesdiner
very nsfw, incestuous, despairing cold hard fucking
enjoy
ALSO SPOILERS BUT DUH
Her face had darkened into a crimson hue, the excitement stirring wildly inside of her was out of control. “Jesus, I want you to FUCK me, sis!”
The two sisters stared at one another, they were in an embrace on the floor broken and ruined as they always felt, despair coursing through their veins, Junko felt the need to discuss every single detail about her despairing life and Mukuro felt the need to listen, and both felt the need to feel one another.
"Do you trust me?"
"Yes."
Junko’s voice piped up. “A loving, trusting big sister. That’s so, so,” She paused and stared down at Mukuro, gazing into her dull grey eyes, her ugly freckles, her stupid large mouth that could be put to many better uses and she frowned. “bor-ing.” She lowered her eyes and drove her knee hard between her Mukuro’s thighs, watching her her chest rise as she sucked in a sharp breath. “Boring, boring, boring big sister! I’ll put some fuckin’ use to you!” She snapped, grinding her knee hard against her.
The words rang through Mukuro’s head, ‘Boring! Disappointing! Pathetic!’ a gasp and a shiver ran down her spine, Junko wanted to fuck hard, Junko wanted to put some use to her, Junko wanted to feel the guilt of their incestuous endeavors. Mukuro took her feisty sister by the pigtails and dragged her back just enough so she could slip her hands beneath her thighs and hoist her up, luckily Junko wasn’t very heavy, Mukuro honestly didn’t know what she was going to do, her judgement clouded by lust and the need to please her sister, “tell me what you want, then.”
Junko grinned at this new passion, a new spark in her sister’s dull expression. Oh, she wanted to snuff it out so badly, so very badly. “I want you to touch me…” She gripped Mukuro’s hand, running it down her chest and pressing her palm hard against her breast. “I want you to feel me-” She gasped, feeling the heavy touch of her older sister running down her stomach, down her thighs, down- down- “I want to give you my despair, Mukuro.” Her face had darkened into a crimson hue, the excitement stirring wildly inside of her was out of control. “Jesus, I want you to FUCK me, sis!” She yelled, gripping the soldier’s breast, clawing her, scratching her, biting her, oh- she wanted to snuff out that fire in her- she wanted her to despair.
The soldier grinned down at her and shoved her against the bed sheets in an uncommon show of strength, breathing heavily in her ear, holding her sisters hips down, “Anything you want Junko.” She bit her lip as she ran her hands down her sister’s body, leaning over her and gasping when she was bitten, scratched, but wasting no time in following her order, slipping her hand into the heat of the delicate folds between Junko’s legs, stroking, frantically trying to please Junko, doing all she could hoping she could drive Junko crazy, “anything.”
"You fucking brute, you sadistic brute!" Junko cried, gripping against the bed sheets, feeling Mukuro invade her like this. "Fucking your little sister so mercilessly! Throwing me around so ruthlessly, so savagely!" Her breath hitched as she felt the pleasure glow inside of her. "And you’re all for me- all of you-" She grips her sister’s head, pushing her down between her legs. "You’ll do everything I want you to, you fuckin’ beast," She felt so warm, a fire of ecstasy burning inside her. "You take orders from me, only me-" She gasped and bit her lip.
Mukuro looked up at her writhing sister gripping her hair, “Its because…” she grinned and pressed her lips to her clit, submitting to everything Junko wanted, and taking it upon herself to kiss and taste and worship every inch of the delicate, slippery skin between her folds. Getting lost in her sisters sweet scent, the way she moaned and wouldn’t shut up, the way she yanked at Mukuro’s hair when she felt each strong surge of pleasure, “Its because you are beautiful and I love you, Junko,” the soldier gasped her words desperately between working hard on pleasuring her sister, she instantly felt her cheeks heat up red embarrassed to let those words slip from her mouth.
"That’s right…" She breathed, thrusting against Mukuro’s lips. "I am beautiful, the most beautiful- I am everything to you- I am all of your love- all of it-" Her breath shuddered as she felt her sister’s tongue against her most sensitive of areas, her head was spinning and she was close- so close- "You love me- only me- ah fuck, Mukuro-" Her fingers dug hard into the soldier’s scalp as she craned her head back, slipping of off the edge and letting the feeling overtake her body, sending shivers down her spine.
The soldier growled slightly and gripped her beautiful sister’s thrashing hips, holding them down so she could finish her off, “Its true, you are everything to me.” Hesitantly she trailed her worshiping kisses down Junko’s thigh, until she ceased shaking, until she let go of the soldier’s hair. Sitting up stiffly, she looked over her sister’s glowing body and wiped her lips with the back of her hand.
Feeling the afterglow, Junko grinned at her sister, whose face was still wearing a bright red flush. “Yes. I’m everything to you.” She sat up and quickly grabbed her sister by the shoulders, flipping her back on to the bed. Junko hovered over her, tracing her fingers down Mukuro’s stomach, before entering the warm flesh between her sister’s thighs. “Tell me how much I mean to you.” She demanded, thrusting her fingers rapidly inside of her. “Tell me how much you want to bring me despair!” She demanded again, salivating at the thought.
"Junko!" Mukuro gasped and wrapped her arms draping over her sisters shoulders in a feeble attempt to be set free from her sisters embrace, "what are you…?" She trailed off only to fall back against the sheets, tilting her head back through gasps, Junko filled each of her senses. "I love you! Of course I want to give you despair!" she gasped out the words her sister wanted to hear with shaky breath, "I’d do fucking anything for you!"
"That’s right," Junko smiled, thrusting he fingers erratically. "You’ll do anything and everything for me…" She felt her sister’s hard grip, her hips bucking furiously against her hand. "Because you love me so very much." She smirked, looking at her sister’s flushing face. "And I love you too, sis!" She purred, knowing her sister was so very close, her usually pasty face was re-colored a bright red as she moaned her name again and again.
Mukuro’s grip tightened on Junko’s shoulders, her view of her beautiful sister went hazy and her ears seemed to be filled with Junko’s talk of despair and dedication and love as she climaxed with heavy panting, chest heaving. “Junko” The simple word escaped her lips in her peacefull moment of pleasure, she stopped grinding her hips and she just relaxed fully for once in her life. A few silent moments later, coming to her senses, Mukuro uttered under her breath.
“We need to go to school.”

id=31204350

id=37157583

I was Ikusaba. I jokingly told Junko that I was…. well, you get the idea.

Rating:Teen And Up Audiences
Archive Warning:Author Chose Not To Use Archive Warnings
Category:F/F
Fandom:Dangan Ronpa
Relationships:Enoshima Junko/Ikusaba Mukuro/Naegi Makoto
Enoshima Junko/Ikusaba Mukuro
Characters:Ikusaba Mukuro Enoshima Junko
Additional Tags:Despaircest
Stats:Published:2013-10-01Completed:2013-11-28Words:4243Chapters:3/3Kudos:2Hits:473
Broken Pieces of Despair
Sinneli
Notes:
The author has gotten the idea from a chatzy RPing for the most desirable way to wreck despaircest. Do not take this seriously, and if this gives you considerable amount of feels, then thank you.
Chapter 1
Ikusaba Mukuro, the Super High School Level Soldier, lay on the bed of one of the dorms in the empty school, panting, thinking, gritting her teeth as she had succumbed into one of her sister’s loving session once again. She hated it. She hated how she became powerless under her younger sister’s authority. She hated how she loved every moment of it. She was the older sister, and she was such pathetic, such a worthless human being. A perfect soldier, falling underneath her.
But she loved it. Loved it too much. She quivered at the thought of her sister caring for her, paying attention to her. She wanted to be more to her sister. To be more than just sister. More…
She shivered again, clutching herself, squeezing her eyes shut and shifting on the bed. Her thoughts drifted, trying to think about despair. Despair… the ultimate truth that her sister was looking for… The ultimate despair of death, magnified thousand times through death and death alone… was not enough for her sister. The ultimate despair when all hope was lost to her sister, no purpose to live, the absolute void type of despair… she hated it. She never had the appeal for despair. Why? Why?
She faced despair. She had no hope. She loved her sister, and she loved her so much, but she couldn’t be with her. Why? Just because she was her sister. They were siblings, and they couldn’t be lovers. Junko probably didn’t care… But it didn’t matter. Everywhere they go, they would be laughed at. There wouldn’t be Monokuma’s masks at their wedding. There would be fingers pointing towards them when they hold hands together… She hated how even despair couldn’t fix this. Even hope couldn’t fix this. Nothing could. Nothing in this world could bring her sister and her closer together.
There was no love between them, and this mixed with her hatred towards her sister. Hate. It wasn’t any standard hate, Mukuro found out. It was queer. She hated her sister, and loved her at the same time. More clearly, she loved to hate her sister. Loving to hate her sister…. Was it so complicated?
It wasn’t a simple, sibling rivalry that urged her to be this way. She couldn’t describe in words, but to say what it would be, it was a black feeling, similar to despair, and yet… so different.
She didn’t want to voice it to her sister. No, she was afraid. She was afraid that she would lose it, completely off her head if she did so.
Perhaps… She thought. Perhaps I should try and have some time off from my sister. She gazed at her phone, then flipping it open to scroll down to two names that were there: Her sister, and Naegi. She smiled slightly as she pressed the call button on Naegi.
“Naegi-kun?” She asked. “Do you mind if I spend the day with you today?”
=========
Mukuro came home that day, a bit happy from the ordeal with Naegi. It did cheer her up, feeling a bit of hope in her. That she could love someone.
A thought occurred to her. An idea that plagued her. She could love Naegi. She could love Naegi and one day, have his children, be happy together. Yes, that could happen. But…
She didn’t love Naegi the way she did with her sister. But then again… she was never normal. Did she love her sister with the sisterly love? Or romantic love? She didn’t know.
“Hey sis.” A voice droned out from the living room. There was Junko Enoshima, the Super High School Level Fashion Girl and Despair, her dear sister. She glanced at her direction. Mukuro could see her; even without the make-up that she always had on during photoshoot, she was beautiful. She could disguise as her sister. She knew that, but they would be different.
“So you were with Naegi?” Junko asked, though she was fully aware of the answer. She smiled at her. “I was wondering if you were developing feelings for the boy, but that’s such a stupid thing to consider.” The voice, filled with arrogance and manipulative air rang in the room. Mukuro asked herself: What did she love in her sister? Why? She was so frustrating, so… infuriating.
“You know, I really want to put him into despair.” Junko’s grin made Mukuro freeze. “Through the ultimate despair. Multiplied, hundreds, thousand times, until his mentality break. Hmm? Won’t that be fun?”
Usually, she would hold it, nodding in agreement as she threatened to plunge someone into despair. But something ticked her off. Something drove her to say something.
“No.”

“Hmm?” Junko turned to look at her sister. “What did you say?”
“I said no.” The voice was firm. “You aren’t going to get Naegi.”
“Huh?” Junko’s face was more of bewilderment and shock than utter confusion. The fact that her sister, who had been so obedient, tell her no. “You…”
“Yes. I love Naegi.” She knew it wasn’t true. She couldn’t love Naegi. She loved her sister. So why were these words climbing out of her mouth? “Is that so bad, sister, that I love someone else more than you? And the fact that, quite unlike you, I am a straight person? Unable to love a girl like you? How tragic.”
Mukuro expected a smile. Her weird laugh. A witty remark about despair. But there wasn’t anything. A shocked face remained.
Silence became minutes, and was broken by Junko. “I see.” There was a sad smile on her face. “So you like Naegi.” She stood up, and walked out of the room.
Mukuro let out a long sigh, or more of a gasp. She had just back-talked to her sister for the first time.
There was a cackle: the weird laugh of her sister, the dreaded “Upupu!” echoing throughout the house. Sound of searching rustled as Mukuro went to investigate.
“Upupupu…. Upupupu… Ikusaba is really straight….” She heard the muttering. Deranged, psychopathic laughter of her sister echoed in the halls. “And with that bastard… Naegi? Oh, yes, this is it… This is the true despair…! I must maximize it… Maximize it!” Mukuro’s footsteps quickened, panicking.
“This will multiply… the thousands… no… millions… however you measure despair… I am having by millions! Oh, I’m so glad… yes, I’m so glad that my sister did this just… for… me…! Just as I stabbed her and gave her despair... she stabbed me and gave me…. Despair….”
She turned the corner, in the main lobby, with her sister her hand extended towards a giant red button. She knew what it was, of course, having part in making it. The execution button, the Super Duper Nasty Torture for her sister, as the final despair. The final, ultimate despair… Something Mukuro never wanted to try. As much as she was a member of the Super High School Level Despair, she didn’t care much for despair as much as her sister did. All was for her sister… And her sister was just about to off herself in it.
The soldier instinct kicked in as she threw herself against Junko, knocking her away from the button.
“N-no! Sis! What are you doing!?” Junko screamed as she started to stand up. “This… this was the ultimate despair…” There was something off about her this time. Her eyes were deranged, lost, and… pained.
“Sister…” Mukuro started, but Junko rambled on.
“I mean… yes… this is the ultimate despair… my own sister… who left me, and came back for me…. Is about to leave me because… of that boy.” Junko shuddered as she clutched herself, giggling uncontrollably. “Despair… despair… this is despair… that I wanted… and it… hurts…”
Tears were flowing down from Junko’s cheeks as she continued to giggle and sob. “Y-You were my only family… You were the only one I can rely on… and when you… when you left…” More giggles racked her body as Mukuro continued to look at her with wide eyes, filled with shock.
“I-I love you sister… I love you… … And need you… so much… So please…. Don’t leave me for him…”
Frustration built up on Mukuro. She had used her so much, and was she planning to use her the way she did once again? No. This had to end.
But did she really love Naegi? No… she didn’t. It wasn’t something she would feel.
She raised her hand and slapped Junko across the face, causing Junko to go silent in shock. Before she could do anything, Mukuro grabbed her sister’s tear-stained cheeks, kissing her lips, tasting the cherry chap-sticks. It wasn’t what she usually gave to her sister, full of passion and love, frustration held back. This time, frustration came first, and along with it, anger, rage, hatred.
Junko was surprised by the sudden difference in this kiss from her sister. As much as she enjoyed it, the roughness and dominance that her sister never displayed, she couldn’t help but feel as if something was wrong. When Mukuro broke the kiss and stared into her eyes… she knew. She knew there was going to be something.
“Sister…. I don’t… love Naegi.” Mukuro was looking at her straight into her eyes as she talked, and Junko found herself, though filled with dread and despair, she couldn’t find herself to enjoy it. Why couldn’t she enjoy despair? She had enjoyed it all her life, and finding despair… this way… was painful.
“I…hate you… sister.” Each word came out harshly from Mukuro’s mouth as she looked away. “I… hate you so much…”
“I… understand…. Maybe…” Junko started. “Maybe I am just… weird and frustrating to you…”
“No, it’s not that, sister.” Mukuro shook her head. “I… absolutely… love to hate you… And it… burns…” What kind of a person would love her own sister this way? She didn’t know. “You know… we can’t be together. We are sisters… And…”
“…That’s what keep us apart.” Junko finished. Mukuro nodded, and Junko looked away. “I see, sister… Then… I’ll just leave, I think… Yes, that’ll be better…” She paused again, hesitating. “I love you… as a sister.” She smiled, tears still falling down her face.
“W-Wait, sis!” Before Junko could react, there was the one last kiss. One last kiss of passion, almost drained, but it was still there. Mukuro was crying as well.
“Good luck sis… drown this world in despair…”
“I will… Mucchan.”

I need to leave for school but I gotta get this down first.
Anyway, Junko sometimes gets mired so deep in Despair (with a capital D) that even she doesn’t know what to do with herself. She finds Mukuro and just clings to her, sitting in her lap with her arms and legs around her twin’s torso, and cries. Just sobs. For hours.
Mukuro holds her, wishing there were some way to comfort Junko, frustrated because she knows there isn’t. Even if there were, her twin wouldn’t want it. Sometimes she’ll try to soothe her with sex, but it doesn’t always work.
Every time, Mukuro can feel Junko pulling her down into the despair, but she never fights it. This is her sister’s vulnerable side, one literally no one else sees, and so Mukuro treasures these moments, painful as they are.