Dark sibling love

Mukuro and Junko

Danganronpa

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Junko Enoshima, she walks around the public eye under the moniker "Ultimate Fashionista". Mukuro Ikusaba, never far behind Junko under the moniker "Ultimate Soldier." But there's a dark secret sisters hold when together. Together, they are the "Ultimate Despair". 2 girls born with no hope at all within them, and so they started plotting to kill off all hope for the rest of the world...

"Hmm...I should hire these girls." Said Darkseid. "What do you think General Chris McLean?"

"Hey, if it means better ratings, I'd want a killer hamster."

"Yeah! That's what I'm talking about!"

Then both high fived!

Meanwhile in Japan we see these sisters in an undisclosed location, getting ready for their next step in Ultimate Despair.

"So, ready to make futas into reality?" Said Junko as she excitedly hopped. "We're gonna make men fall into even deeper despair than women!"

"Yes sister, I'm trembling with excitement."

"So Monokuma, is the futanari serum ready?"

"Upupupupup, I might fall into despair already, since I'm a guy with no penis at all." He then laughed again.

"Like, yes or no?" Frowned Junko crossing her arms at the bear mixing chemicals in beakers.

"Yes, yes, yes, just a few more mixes, so stop complaining." he Said before grabbing a vial of pink liquid and mixing it in.

"Ugh, like, sometimes waiting is such a drag."

But Monokuma finally finished as she ranted. "Here, sheesh!"

Then Junko swiped the vile. "With this, men will be a thing of the past when they all get cucked to death by futanaris!" she laughed while her sister blushed. She looked at the vial though and raised an eyebrow. "Then again, if it's wrong, it'd be stupid if I up and died from it. Hey pig! Why don't you test it out instead?"

Mukuro simply nodded her head and took the vial from Junko's hand. "Anything for you Junko." She eagerly drank the vial, but then Monokuma dressed up like a frat boy.

"Chug! Chug! Chug!" Monokuma and Junko chanted.

As soon as it was gone, she sighed and smacked her lips. "It tastes fruity."

"How do you like the Tropical Punch flavoring I added? I wanted to make sure it went down easy." Monokuma explained.

And suddenly, Mukuro felt an uncomfortable feeling in her pants! She groaned, hugging her stomach as she dropped to her knees.

"Like, don't tell me you can't handle a little change? Ugh, such a pain." Junko casually scoffed, but Mukuro just smiled with a blush.

"I-I'll be ok Junko, just, ah! T-Trying to get used to it."

"Okay, but you still need to be punished." Then she started kicking the side of Mukuro's stomach!

"Thanks sister!"

Meanwhile under Mukuro's panties, her genitalia changed from a pussy, to a 2 foot long dick with huge swollen balls!

The warm throbbing sensation made her gasp, rolling on her back as Junko saw it form a bulge underneath her sister's pants.

"Lemme see! Lemme see!" Then she pulled Mukuro's pants down! Her eyes widened as the dick stood tall and erect. "Oooooh~, now we need a test womb to make sure the dick has working sperm!" grinned Junko licking her lips at the sight. 'Hot damn! That could put a dog to shame.'

As Mukuro got up and looked at Junko, she had an idea. "I know a womb we could test this out on..."

"Oh, really? Is it that swimmer bimbo? Getting her pregnant would totally cause despair towards her fans."

"No, no...I was thinking of..."

"The gamer girl? Yeah, I can imagine a couple of monotones as the Eve and Eve of Futas."

"No, someone even better." smiled the girl, shaking as her dick throbbed and licked her lips. "You!"

"Eh?!" Junko let out before her sister tackled her to the ground. "Hey! What's the big idea you ugly sow!?"

"It only feels right, right? The Ultimate Despair inbreeding for the 2nd gen Ultimate Despair?"

"Well, you do have a point." She said, now that she thinks about it. "But that's no reason to suddenly tackle me, I mean sheesh, no flowers or a wedding ring?"

"I'll make up for it, but right now, I need your body!"

"Fine! Monokuma, leave us!"

"Don't gotta tell me twice." Then he ran away!

"Okay, now come here sis!" Junko claimed Mukuro's lips and Mukuro started rubbing her dick against Junko's panties!

'Ahhh~ Junko's lips taste sweeter than I imagined~! My penis feels like it's going to explode!'

'Dang, my sister's an even bigger freak than I thought.' Junko thought as she squeezed Mukuro's brand new nutsack. 'But that doesn't mean she can get the drop on me.' She then rolled around so she was on top! "Mukuro, I'm disappointed in you, I thought I was the leader." She said before unbuttoning her shirt. "Time to show this little sow her place." she smirked before tossing her shirt aside with her sister seeing a clear look at the lacy bra.

"Now lay down and let me take the lead." She said before grabbing the zipper to Mukuro's pants. "Ready for this dick to wobble free?"

"Please Junko, please!"

"Hmph! You know what? Forget it." Then she got up.

"W-What?"

"You don't deserve a womb like mine, even if you do have a giant salami!"

"B-But Junko!"

"What? You think just because you have a dick, I'd get wet? Ha, I bet Izuru Kamukura's got a bigger one than you. He's the Ultimate Everything!" she mocked, turning her back while her sister bit her lip.

Meanwhile with Izuru Kamukura...

Izuru looked down and saw that his dick has grown exponentially after Mukuro grew her futa dick. "Someone trying to beat me in dick length? Nice try..." He said, feeling nothing.

Back to Junko and Mukuro.

"But sis!"

"Just get off to my magazines, but buy your own tissues or just live alone in a stinky cum cave!"

Mukuro bit her lip as Junko moved to walk away, her sister's eyes narrowing before she lunged, tackling Junko to the ground. "No Junko, not this time."

"Ugh, seriously?" groaned Junko who felt Mukuro rub her girth against her ass. "I can't believe my own bitch of a sister is literally dry humping me. Go hump a tree or just wait until I get some slut you can fuck."

"No! I want you sis!"

'If she's gonna be like this, I should ask Monaca to write schemiatics for a Monokuma sex doll.' thought Junko before finding herself on her back, her sister grabbing at her bra and tearing it off and showing her bare breasts.

"I can't wait to drink my sister's milk!" Then she started rubbing her nuts in Junko's face! "The kids can't wait drink mommy's milk as well!"

"Hey! Get that smelly thing off me!"

"No!"

That's when Junko punched her in the nuts!

"Ooooooh!"

"I'm disappointed in you Mukuro, you should've realized, you're a futa now, as in, you have a very exploitable weakness." mocked Junko with sadistic pleasure. "You're like a little dog that hasn't gotten fixed."

"Ah! Don't castrate me!"

"Hmm...I wonder if you could grow your dick and nuts back if you drink the potion again."

"Aaaaaaah!" she cried out while covering her spot, only for her sister to smirk and laugh.

"Wow, you even sound like some virgin dork too scared to show off his dick!"

'Why is she toying with me? We need to make sure these dicks have working sperm!' thought Mukuro who narrowed her eyes, something in her clicking. "Wait a minute..."

"Huh? What's wrong? Besides your flaccidness?"

"Why are you dominating me? I'm stronger than you!" Then she spin kicked Junko in the head! Making her fall to the floor!" "I'm going to do what I should have done before!"

"Oh fuck me." Junko cursed with puffed up cheeks.

"Sure thing." her sister grinned before grabbing at Junko's breasts roughly and started squeezing them.

"Aaah!" Junko moaned from the rough treatment!

"Your breasts have always been amazing sister, I was never jealous of their size, but I was jealous your bra was the one thing that could hold them all the time!"

"Mmmh~ well get a good feel, because I'll kick your ass when we're done here!" moaned Junko, sounding defiant, but shivering in pleasure from the hands.

As Mukuro kept squeezing her chest, she moved down and started licking Junko's neck! "You smell so good Junko~ I've had dreams about this~" she whispered in a lustful tone.

"Well soon reality will tell you to keep dreaming."

"Still trying to resist? Maybe I should just fuck you right now!" groaned Mukuro who rolled Junko on her back, grabbing her by the hair and rubbing her dick with her free hand, bringing it to her sister's face. "I'll start with your mouth."

"Yum, yum, a big ol' hotdog for Junko!" Said Junko in a different happy personality. She stuck her tongue out and gave the sides a lick, noting the musky smell with her sister biting her lip from the rush of pleasure that hit her. "So salty, and you haven't put the white sauce on yet." Junko commented.

"Quiet and lick it bitch!"

She complied and licked up and down Mukuro's dick as she aggressively grinded it against her face!

"Ahhh, your tongue was made to lick dick!" She moaned. "You're gonna be pregnant 24/7 for now on, got that!" She said before shoving the whole thing down Junko's throat!

Junko let out a muffled yell from that, her throat bulging around the girth.

She thrusted in and out, as roughly as she could!

"No biting." Said Monokuma, with razor sharp claws pointed at Junko! "Or else I'll REALLY get rough."

'I thought I told him to leave, what the fuck is he doing here? Is it because...my loss of domination is despairing?' She thought before Mukuro's dick started twitching.

Mukuro's first load overflowed in Junko's mouth!

"Ahhhh~!" Mukuro let out with her tongue hanging out with a smile as she gripped Junko's hair tightly to keep her there.

Junko did not gag surprisingly as this happened. She felt her eyes rolling back in her head as she felt the sperm pour right into her stomach, her panties feeling soaked.

After coming, Mukuro let go and then took off her shirt and bra! "I want our hard nipples to kiss as we make a baby together!" She grinned before slamming her lips over Junko's, snaking her tongue inside with a moan.

As they kissed, Mukuro rocked her hips forward and back, clumsily missing her sister's pussy!

"Oh for Pete's sake." Monokuma grabbed Mukuro's dick and guided it in Junko's pussy! "There, now make sure to really tear that hymen to shreds!"

Without another word, she slammed right inside with a moan, making Junko cry out in a mix of pleasure and pain, a bulge forming around the girth.

"Oh fuck, you're gonna rip my stomach open with this huge thing!" Junko moaned! 'My own sister is using me like a dog in heat! Oh god! The despair I'm feeling right now is like getting high!' Then in Junko's eyes, layers and layers of darkness started folding on top of each other as the swirls were also forming hearts!

"Ahhhh! Having a dick feels so good! Being stuffed inside your slutty pussy is bliss!"

"For me it's hell, but a good hell!" cried out Junko, her breasts bouncing with each thrust which mesmerized her sister.

"Our child will contain both your despair and my despair combined! They'll be twice the despair we are!" Said Mukuro.

"Oh fuck! Come on! Go faster damn it!" Junko moaned as she wrapped her legs around his waist!

"Don't give orders to me slut!" Mukuro ordered, lightly slapping her sister, making her yelp as she began to slow down. "Right now, I'm the one calling the shots."

"Just pump that spooge down my cunt already!"

"Shut up slut and take my sperm!" Mukuro's dick twitched then flooded Junko's pussy! There was so much that Junko's belly inflated!

"AHHHHHHHH!" Both sisters moaned as they squeezed each other's chests.

Later we see Mukuro pull out...

"Okay, after I check that you have functioning sperm, we can!" Then Junko flipped on her belly! "Mukuro?"

"We're not done...there's one more hole I must claim..." she spoke in a cold and lustful tone with her eyes empty and determined, making Junko shiver in what felt like nervousness.

"You're gonna penetrate me in my ass!?"

"That's right, I've seen how tight it looks, and now I'm going to stuff it too!" cried her sister with a crazed look before jamming it inside without hesitation.

Junko grit her teeth as it went further and further inside! 'Fuck! The tip will come out of my mouth if she keeps pushing further in!'

"Ahhhh! It's tighter than your cunt! I love it!"

"I should've worn something tight! It feels like I'm getting split in half here!"

"Damn right you are! Ah fuck yes!" groaned Mukuro, reaching down to roughly squeezed Junko's breasts while slamming in and out.

"If that thing gets any further! It feels like I'll end up vomiting your cum!" Junko moaned!

"I'll make it happen! I promise!" Mukuro got even more rougher as she thrusted!

"Ahhh! Ahhh! Ahhh!"

"How is your bone structure not cracking to pieces?" Asked Monokuma.

"Stuff it teddy!" roared Mukuro with a scowl. "If you say one more word while I fuck Junko's ass, I'll do the same to you!"

"Okay, futas aren't my type anyways."

"Shut the fuck up and fuck my ass!"

Mukuro obliged, no words, just increasing the speed and strength of her thrusts eventually making her dick twitch! "Here it comes you slut!" Then her final load filled her up one more time!

"Aaaaah!" Junko moaned out before the cum blasted out of her mouth! She gagged and coughed, her sister biting her lip and her eyes rolling in her head with a grin.

After cumming, both were on the floor, exhausted and sleeping.

"Well, that was a success." Monokuma declared. "I'll just go get this potion in the water supply "

He left them to sleep.