This is probably like the future in the short story Join Us if Mei got impregnated by Yuzu and uses the baby to make Yuzu join her. Unfortunately Yuzu's grandfather wasn't going to let her go easily...

"Run! Mei! Take the kids! Run!" Yuzu said and Mei grabbed the young 7 year old and 2 year old before running away from the men
"Get her!" The old man exclaimed and Yuzu used her flames to ignite the place
"What the hell is wrong with you!? Leave us the fuck alone!? They're just kids!" Yuzu exclaimed
"You've been nothing but a disgrace to your family! I can't believe my only successful tool turned out to be like this!" The old man said and Yuzu gritted her teeth
"I won't let you hurt them!" Yuzu shouted
"Be prepared to die then!" The old man exclaimed. Meanwhile Mei tried her best to escape immediately as she went to the forest nearby but flinched hearing gunshots
"Hurry! Over here!" One of the men called out. Mei gritted her teeth hoping to find a spot to hide until she felt a sharp pain on her shoulder
"A-agh! A-ahh!" Mei exclaimed and almost fell but kept going before receiving another gunshot. Mei fell down with the kids on top of her
"Mama!" Mokuro exclaimed
"Waaahh!" Yura cried as she didn't know what was going on. Mei panted heavily and tried using her powers but winced in pain
Wh-what!? I can't-
"R-run! Mokuro run! Go!" Mei said
"Wh-what? B-but mama I-" Mokuro's eyes widened Mei pushed him back receiving another bullet
"Aaaaggghh!!! Ugh! R-run! Run away! Quickly!" Mei cried and Mokuro trembled before managing to get up. He grabbed Yura and did his best to try to escape the men. He kept running away and didn't stop until he tripped. Mokuro gasped and turned his body around to fall first to keep Yura protected
"Mama! Waaahh!!" Yura cried and Mokuro hugged her tightly to try to muffle her cries. Tears rolled down his cheeks as he trembled
"I-It's...it's okay..." Mokuro said in a shaky tone. He held tightly onto his sister and gasped hearing footsteps. Mokuro immediately went near a tree and held Yura tightly. His heart started racing as the footsteps got closer and closer. He gritted his teeth and shut his eyes tightly
"LEAVE US ALONE!" Mokuro shouted
"...it seems like it happened to you as well" The woman spoke and Mokuro opened his eyes to see a woman. The woman knelt down and held her hand out
"No worries. You two are safe now. You are okay" She said and Mokuro sniffed as he whimpered
"My name is Liana Nagemine. I am a dear friend of your parents" Liana said
"Fr-friend?" Mokuro asked and flinched as Yura cried kept crying
"I'll bring you to the others" Liana said and pulled some small powder before blowing it on them
"H-huh? What ar...are...y-you..." Mokuro felt his surroundings fade into pitch black and fell asleep against the tree with Yura in his arms. Liana heard the group of men approaching as they tried to look for the kids and carried them in her arms. She dropped another powder which caused her body to vanish along with the kids
"Huh?! Where the hell are they!?"
"They were close, right?"
"Do you think the boss will be happy about this?"
"Tch...let's keep looking"
Meanwhile Liana teleported inside her home. She had the two sleeping kids in her arms before heading towards the room where she kept the rest of the children
"Huh? What the hell?" Hana asked
"Ah...I knew something like this would happen. It's unfortunate those bastards got to them. I was hoping I'd have some more time to fix something up..." Liana said
"You mean that special project of yours?" Hana asked
"Yes. If I'm able to finish it then...it'll enhance the strength of a person including their powers. And Mokuro...would be a perfect candidate for that" Liana said
"So you think you can take care of them easily?" Hana asked
"We" Liana said
"Huh? Hell no. I'm not going to take care of them with you" Hana said
"This'll be some practice when your kid is born. Nene is pregnant right?" Liana asked
"H-how the hell do you know that?" Hana asked
"I know everything. Anyways...help me prepare something for them" Liana said
"Haaa fine..." Hana said

12 years later
Mokuro- 19
Yura- 14
Hasura- 18
Shinjo -17
Misuki- 15
Nyoko- 12

"Run! Run!"
"Aaaahhhh!!!"
"D-don't please!"
The group of men cried in pain as they were being burned alive until their bodies were nothing but ashes. The flames started growing as it began to devour the entire building. The young man watched everything go down and turned into a shadow before leaving the scene. He appeared above another building and heard the sirens go off. Mokuro sat down at the edge of the building and felt a cold sensation nearby
"Hey Shinjo..." Mokuro said
"Don't you think it's about time to go after him?" Shinjo asked
"Guess it's finally time huh? Is everything ready?" Mokuro asked
"Yeah. Hasura and Misuki have set everything up in the building. We're just waiting on you...and Yura. You both are just playing around with people and torturing them" Shinjo said
"Hahahaha...it's fun. Thought you enjoyed that sort of stuff" Mokuro said and noticed the heroes coming into the scene. His lavender eyes glowed before grabbing Shinjo
"Let's tell the others that it's time..." Mokuro said as he surrounded both of them in the shadows. They both vanished into thin air arriving in an alleyway where he found a young 14 year old girl stabbing the dead body with her dark shadow tentacles. Mokuro walked up to her and patted her head
"Hey...he's dead already" Mokuro said and Yura stopped before turning to look at him with her lavender eyes
"Didn't I leave Hasura in charge of you?" Mokuro asked
"...she left with her cousin for something" Yura said
"And she left you here alone?" Mokuro asked
"No" Yura said
"I'm here!" The dirty blonde said as she popped out
"Huh? What the fuck are you doing here? Shouldn't you be home?" Mokuro asked
"Hasura said I can join!" Nyoko said
"Auntie Nene is going to worry again..." Shinjo said
"I'm not a little kid anymore! I'm going to fight and kill people like you guys!" Nyoko said
"That's the spirit!" A girl said from above. The two girls jumped from the building landing on the ground
"And I'm back!" Hasura said
"Hey...I said to take care of my sister" Mokuro said
"Oh please. Yura can take care of herself" Hasura said
"She's an Omega. It's still dangerous" Mokuro said
"So what? That doesn't fucking matter to me. Let those disgusting Alphas get close to me. I'll teach them a lesson" Yura said
"Haha! Hell yeah! That's my girl!" Hasura said wrapping an arm around her but Yura turned her body into a pure shadow making her fall
"Gah!" Hasura exclaimed and levitated before falling
"Are you really ready? Shinjo told me that you and Misuki set everything up" Mokuro said
"We did finish. Hasura decided to get something to eat afterwards" Misuki said
"Well...we should head to our places. Remember...let Shinjo break everyone from prison and that's when you two end up blowing up the buildings" Mokuro said
"I got it" Misuki said
"And make sure not to die. If anything goes wrong...immediately set the signal. I will be there to protect you" Mokuro said
"Awww you're such a caring big brother. Yura is so lucky to have a big bro like you" Hasura said
"That's because you're all my family and we will take care of one another. I made a promise to you all that we will get our revenge...and take over this shitty world" Mokuro said
"Yes sir" Hasura said
"See ya" Misuki said
"Wait...what about the little one?" Shinjo asked
"Little one?!" Nyoko exclaimed
"Hasura..." Mokuro said
"I'll take care of her! I promise to do my best!" Hasura said
"Fine" Mokuro sighed
"Good luck everyone" Shinjo said. The small group split up leaving the two Okogis alone
"Come on, Yura. Time to give grandpa a visit" Mokuro said and Yura walked beside him
"Are we going after his men first?" Yura asked
"Sure. We've got some free time to do what we like before they blow up those buildings" Mokuro said
"...okay" Yura said. The two immediately vanished and into the darkness waiting for the perfect moment to strike. In another building, the young boy stood on top of the roof where he was going to sneak in
"...heh...so how do you plan on doing this?" A voice spoke. Shinjo rubbed his head as he heard the voice and sighed
"Easy" Shinjo said and froze a piece of the building before breaking in. The sirens were activated letting the guards know about the intruder. The guns that were in the corner started aiming for Shinjo but the bullets couldn't pierce his skin because of the ice that protected him. He attacked the cameras and guns with his ice crystals. The sound of loud footsteps were heard as the guards were trying to get to the location. Shinjo found a vent nearby and broke into it before crawling inside of it
"Hey! I want to do some killing!" The voice shouted
"Quit yelling. It gives me a headache" Shinjo said
"Why won't you let me take over? I can easily handle them" The voice said
"Once I break them free...you can do what you like. Right now I don't want to waste that much energy on getting rid of them" Shinjo said and broke into an area where he found a thick door that was locked. He jumped from the vent and landed in front of the lock system where he froze it to break the lock to the door
"Hahahahahaha...hahahahaha...hahahahaha! Hahahaha! HAHAHAHAHA!" A loud laughter was heard as the door slowly opened. Shinjo's dark violet eyes met up with a pair of dull blue crystal eyes. He stepped inside before pulling out a syringe
"This'll help..." Shinjo said
"Ah...so you're my little-ow!" Shailung exclaimed as Shinjo stabbed him
"Don't move too much" Shinjo said, injecting a special liquid to help him. Shailung laughed softly as he froze the restraints that held him for years
"Heh...finally...I can take my revenge on every single bastard here" Shailung said and broke the restraints. He looked at Shinjo before patting his head softly
"It's great to finally meet my grandson in person..." Shailung said
"Mm...it's nice to meet you, grandpa" Shinjo said
"Let's go out and eat something okay?" Shailung asked
"Sure I guess" Shinjo said
"Lock the doors!"
"Get everyone in their positions"
"Shut everything down!"
"Quick!"
The group of men were heard as they tried to keep everything calm but Shailung laughed before freezing the men in place
"None of you can stop me now!" Shailung laughed as he rushed towards them to slaughter them. Shinjo ran away as he took the opportunity to head for the control room where he easily broke the entire lock system letting all the prisoners free
"Let's fucking go!"
"I'll kill you all!"
"We're finally free!"
The prison was a complete disaster as the prisoners were free to do what they wanted. As the prisoners started to roam free in the city, the two cousins watched from afar and Hasura held the remote
"Man, I'm surprised that Shinjo finished it quick" Hasura said
"We should get ready" Misuki said
"Yep. You're right but you know...why don't you do it?" Hasura said handing the remote to Nyoko
"Eh!? Really?!" Nyoko exclaimed as she was excited
"Yeah!" Hasura said
"Okay! Three! Two! One!" Nyoko said and pressed the button setting off the bombs. The city went in ruins as some buildings were blown up into pieces along with a couple of homes where families were killed
"Huh? Hasura, what did you do? How did those get there?" Misuki asked noticing that some explosions were near houses or apartments
"What?" Hasura asked as she smiled
"We were only supposed to destroy the buildings Mokuro ordered us to" Misuki said
"...because I hate seeing families being happy together. It...makes me remember them...which is painful so...why not get rid of them too? Besides...we shouldn't care about others. We only care for each other right?" Hasura said
"...you have a point" Misuki said
"Woah! It looks so cool" Nyoko said
"Right? Now time for the best part" Hasura said as she got up before holding her hand out
"Let's go ahead and join the fun" Hasura giggled and Misuki held her hand as she got up
"Sure but will Nyoko be okay?" Misuki asked
"Yeah!" Nyoko said
"Hehe she will be" Hasura said. The peaceful night was soon turned into a chaotic mess as the civilians tried escaping from the villains. Heroes appeared at the scene trying to do what they could to protect the people. While everything was in ruins, the old man couldn't help but tremble at the horrific sight of the chaos that was going on in the city
"Sir, we're doing our best to stop them" The man said
"Are you sure you bastards are doing your jobs!? How the hell did you let this happen!?" The old man exclaimed
"We're not sure, sir. We are trying to find the culprits for the prison break and the cause behind the explosions in the city. Unfortunately, it'll be difficult" The man said
"Huh? Difficult? What do you mean?!" The old man asked
"...we've kept Shailung locked up in that special room to weaken his body for years. Even if he managed to break free there is no way he could have his power back. But...he somehow managed to regain his power once he broke free. What's worse is that...his strength seems to be far more powerful than before. I'm not sure what's really going on but he's easily killing-agh!" The man exclaimed as he was thrown against the wall breaking his skull. The old man's eyes widened and immediately set his palms in flames as the lights went out
"Wh-who the hell are you!? Show yourself!" The old man said
"...I was always curious about what was happening in your mind when you did that. Did you feel any guilt? Were you upset? Did you feel anything when you killed them?" A voice spoke and the old man looked around trying to find the person
"I can still remember that day. I will never forget what happened on that specific day. It was a nice calm day until you ruined it all for us. So...I thought...why not do the same to everyone? Because of you...everyone in this world is going to die" Mokuro said as he stepped out of the corner
"H-huh? Y-you...you're-"
"Hey...grandfather" Mokuro said and beside him appeared the smaller girl
"Y-you two...are st-still alive?" The old man asked
"Heh yep. It's been years since the last time we saw each other so...we have a lot of catching up to do hm?" Mokuro said as his eyes glowed
"N-no...no wait!" The old man said as he attacked with his flames but the two vanished. He went to his drawer where he pulled out a gun. He looked around trying the area until he caught a glimpse of a figure
"Stay back!" The old man said pulling the trigger. Mokuro appeared looking at his shoulder and pulled the bullet out
"Heh...I don't think your little bullets will work this time. If you remember correctly...mother was capable of healing her wounds right? Unfortunately her healing wasn't good enough to rapidly heal herself but lucky for us...we are capable of rapid healing. So...you can't get rid of our power with it" Mokuro said
"St-stay away! Stay back! GET AW-ACK!" The old man coughed as Mokuro held him by his throat
"...hey grandpa. Let's do something fun..." Mokuro said as he smiled

This was supposed to be something for the spooky season but yk been quite busy. I'll do better next year or Christmas since that's coming up soon.