AN: Sorry for not updating, I usually take inspiration from Demon Lord animes, but this season is lack lustering for me to even work. But with Overlord coming back, things might pick up. Anyways, enjoy the chapter.

Ch 3 Sibling Teamwork

Holy Empire Ruberios

"P-Please…M-Mistress Luminous…" A ragged blonde man gasps, huffing after grueling months of torment from a white-haired Vampire, revealing all he knows about the Wizarding World. His eyes looked up at his captor, sitting casually while he after that experience. "…I-I have told you everything…" He said, breaking down.

Luminous Valentine, Demon Lord of the Holy Empire Ruberios sat on her chair in her Palace's dungeon. She sighs knowing this Wizard was telling the truth. "It seems so, it seems my Extra Skill Demon Lord's Haki has done a number on you, Gilderoy Lockhart." She stands from her chair, turning to the exit.

"What a shame…" Luminous sighs, opening the cell door.

Lockhart heard the door open, he rushed to the bars staring at her with pleading eyes. "W-Wait, y-your promise! You've promised after I gave you what I know about the Wizarding World, that you'd give me my freedom!" He shouted.

Luminous turns her head to the pathetic man, watching him in a pathetic state. "I did, didn't I?" She turns her head, continuing her way to the stairs.

"S-So let me out, so I can return to the Wiz-"

"Return to the Wizarding World you say?" The Queen of Nightmares turns back to her prisoner. "Why should I return you back to the backward place? I will indeed free you, but since you know too much already, I can't let the possibility of someone in Harry's World know of us." She stated.

Lockhart jumps upon hearing he can't go back to Britain. "B-But I won't tell anyone! I swear to the Great Merlin!" He lied, knowing that he might get his reputation back if he reveals who Harry's associating with.

Luminous chuckled, sensing he was lying from where she stood. "Lying to a Demon Lord isn't smart, Lockhart, especially to one who's a Vampire." She advises the fool. "But I digress, your insights have been fruitful for the least part. I will reward you later,"

"WAIT! WHAT DOES THAT MEAN!?" Lockhart cried, quivering for what will happen to him. Luminous didn't bother to answer, leaving him in the dungeon-like she does every time for information.

In a private room of her Palace, Luminous was greeted by Leon and Guy who were waiting for her. "Sorry to keep you two waiting, but there are some last details I want to make clear with our informant." The Vampire apologizes to her guests.

Guys smile, turning on his heels to face his fellow Demon Lord. "Not a problem, this is all for a better understanding of our young aspiring Demon Lord's World. Now let's get this little meeting started!" The Primordial Demon of Red announces, walking to the miniature table.

"Shouldn't we let Rimuru in this meeting of ours?" Luminous asked, sitting in the largest seat since she's hosting the two.

Guy sat down, giving a carefree smile. "Our Rising Star deserves his time with his children, there's no need for him to get involved in the as of right now." The Leader of the Octagram stated, "Now, Leon." He looks over to the Demi-God, sitting next to him at the table.

Leon blue eyes the red-haired Demon, "You've spent quite a bit of time with those Wizards what do you think of them?" Guy asked the Platinum Saber.

"From my interactions and observations…they're utter idiots. The whole race," Leon stated, disliking how the entire government is disorganized and superstitious about everything. "The boy has a lot to work with dealing with their government."

"Oho? What makes you believe that Harry would be willing to take over his home world, Leon" Luminous asked the blonde Demon Lord. "After all, he's Rimuru's heir and will take over as the Demon Lord of the Jura Tempest Federation."

Leon scoffs, hearing what the Vampire said. "That notion is impossible since we're all immortal." The Demon Lord stated.

"True, but who knows maybe Rimuru might retire someday soon." The Queen of Nightmares smirks, very intrigued by the young Prince of Monster's destiny.

Guy chuckled at the thought of their newest and one of the Strongest Demon Lords retiring. "That's a funny thought, but you know Rimuru. He's not the one who sits ideally by while things are happening."

Both Leon and Luminous agreed with Guy, never in a million years or billion would Rimuru retire. "In any case, the Wizarding World is probably the most eluding place we've ever seen. Though we now have allies thanks to Rimuru and his son's efforts there,"

Leon eyes the Leader of the Octagram, "Guy, why are you so interested in the Wizarding World? It's not in our jurisdictions as Demon Lords." He asked.

"Ah, now that my friend is something I've been waiting to hear." The two blinks confused with what the Primordial Demon was saying. "You see, the World of the Wizards is in disarray. I'm sure you can tell Leon."

Leon remained silent but agreed with Guy. The discrimination of non-Pureblood Wizards and the weakening Magic in their society is something Guy will get involved in. "So, I'm assuming you have a plan and this plan has Harry in the center of it."

Guy smiles, "You got it,"

"Curious, what is it?" Luminous asked the Primordial Demon of Red.

Tempest, Ramiris's Labyrinth

"HA!" Harry slashed down at a Wolf monster; he huffs turning to see his Sister blasting the monster with another of her Water Blades.

Shinsha smiles, turning to her brother to see if he needs any help. Upon doing so, she saw he was already done with her side. She smiles, seeing that he was done with his fair of enemies.

Harry sighs, knowing his-their dad, he might find out that they didn't at least try to converse or work together. He turns to his sister, "So, are these monsters tough for you?" He asked, feeling like he said it as an insult.

"O-Oh…um not really, Onii-san," Shinsha answers her brother. "The monster I face are weak compared to those in the lower levels. The ones near Uncle Veldora's floor are stronger than the ones here." She explains, remembering what Aldaman has taught her.

"I see, so do we assume that further down the monsters will get tougher?" Harry looks past his Sister to Albert and Myrtle coming forward from the darkness of the dungeon.

The Pink Slime looks back where her brother looked, seeing their guides coming.

Albert smiles softly, walking at Myrtle's pace. "Indeed, young master. Ramiris-sama has made this challenge is to make you two work together." The Death Paladin explains to his young master.

Harry sighs, turning to the other end of the hall. "Then we should continue down the hall," He suggested, taking the lead of the group.

"I agree with Onii-san. There's more to get through before we reach the tenth floor." Shinsha stated, following her brother's lead.

The Chaos Doll looked at the Death Paladin, smiling at what just happened. "(Sir Albert, did you see that?)" Myrtle asked her fellow monster.

Albert nodded, looking at his Lord's children, "Indeed, they are beginning to work together, just like Rimuru-sama hoped." He grips his sword, trading forward to be close with the children of Tempest. "Come, Lady Myrtle, we must not linger here for long."

"Yes, Sir Albert." Myrtle looks up at the top walls, thinking about something. "Do you think that Lady Ramiris prepared what we asked?" She asked her comrade.

The Death Paladin looks up at the ceiling, seeing a few sparkles appearing. "I believe so, Lady Myrtle. Pay them no mind, their task is to watch the young master and lady." Albert advises the newcomer to Tempest.

Myrtle nodded, understanding what he said. "You're right, Sir Albert. I will-" The Chaos Doll looks over where Harry and Shinsha should be, only met with nothing. "Sir Albert, they're already gone!" She stated.

"What do-" Albert looks where the children of Rimuru were, meeting an empty space. "You got to be kidding me," The Death Paladin sighs, already losing track of his charges to the Labyrinth.

The blonde Undead man looks at the Doll, "Lady Myrtle, please stay close to me." Albert orders her, "We're going to enter-"

"Dangerous levels, yes Bretta informed me of the layout of the Labyrinth we're in," Myrtle said, confident in her knowledge. "I'm counting on you, Sir Albert."

Further down the Labyrinth, a group of wolf monsters appeared guarding a large door. They weren't like the Tempest Star Wolves on the surface, they were more mob monsters with basic instincts.

Harry and Shinsha were standing before the pack, ready for their attack. "Seems like those wolves are mob monsters that Ramiris-sama created." The Pink Slime informed her brother. She looks over at him, curious what the plan is.

"Onii-san, what do you have in mind?" Shinsha asked the heir of Tempest.

Harry took the moment to scan the area and the mobs. {Notice: The Labyrinth Wolf at the back is most likely to be the leader} Rapheal informed her master.

{Warning: The Magicule level of the Labyrinth Wolf is stronger than the others in the pack.} The Ultimate Skill gave more information about the enemies before them. {Suggestion: Try…}

Harry nodded, hearing out what Rapheal has planned for this situation. "Okay, okay," He turns to his Sister, ready to attack at any given notice.

The Ach Mage sighs, finding no better time than now to work with her. "Shinsha, I could use your help with a plan that I have," Harry asked for his Sister's assistance with this.

"Mmmm?" Shinsha moved from her battle stance, looking at her brother. "What do you have in mind, Onii-san?" She asked.

"I need a distraction; can you do that?" Harry asked the Pink Slime. He hoped that she can understand what his plan was.

Shinsha smiles, nodding to his simple request. "Hai! I can do that!"

Harry moves back, switching places with his Sister to do her stuff. Shinsha now faced the Labyrinth Wolf pack. "Listen up, I am Shinsha Tempest daughter of Rimuru Tempest and sister to Harry Tempest!" She raised her hands slowly, about to attack.

She raised her hands, creating waters out of thin air. "Take this!" Shinsha lowered her hands, guiding the wave of water to attack the Wolf pack.

The Wolf pack charged at the attack, most dodge the wave of water; especially the leader. Those who didn't dodge were pushed back to the back wall, where they are being pinned.

The Wolves that dodge Shinsha's attack landed on dry spots, avoiding the rushing waters. The leader barks, commanding the few wolves to attack the two,

Shinsha saw the wolves reorganizing themselves and were about to attack. "Onii-san, the Labyrinth Wolves are plotting something." The Slime informed her brother. "Anytime for you to move will be nice. I'm sitting ducks here,"

"Just keep at it, Shinsha," Harry said, placing his hand on his sword's hilt. He remembers what Hakurou taught him, one whose patient will see the light. After many hours of cracking down on what that phrase means, he finally knows what it means. "Deep breaths Harry, the opening will present itself." He said, watching the Wolves.

The Labyrinth Wolves began to make their move, two went to the left and two to the right side. The pack leader remained in the center, observing his Subordinates maneuvered in the small space.

This was the opening that Harry was waiting for, he drew his blade and stepped forward. In a flash, Harry took out two Labyrinth Wolves and landed on the clearing near Shinsha's water spell.

"That's two," Harry turns around and sees the remaining few left. Two on the other end and the Pack leader. "Two more to go." He turns to his Sister, still pushing back the Labyrinth Wolf with her Water spell.

"Shinsha, you can stop for now!" Harry informed the Pink Slime, "Save you're Magicules for the final floor!" The Arc Mage stated, wanting his Sister to save her strength for the Floor Boss.

Shinsha nodded, lowering her arms, which causes her Spell to stop. "Do you have a plan Onii-chan for the Alpha Wolf?" She asked the heir of her home nation.

Harry nodded, looking back at the Wolves in front of them. The Pack leader barked orders to the remaining Wolves for a coordinated attack on the two. "Yeah, just follow my lead." He smirks, letting his confidence show.

The Pack leader growls, seeing the boy's arrogance clear as day. He barks at his Pack to advance at the two children.

Suddenly Harry held out his hands, igniting flames on his palms. "Flame Wall!" He released it into the ground, creating a wall of flames.

The Labyrinth Wolf Pack barks, rushing at the Children of Tempest. They ran as fast as lighting, following their leader's orders that they didn't take the consideration a trap made by them.

"Oi! Puppies, over here!" Shinsha came out of the fire, waving at the Wolves.

The Wolves stop their tracks, seeing the Pink Slime in the open. They went after her, following the commands of their Alpha.

Shinsha smiles at the incoming Labyrinth Wolves coming for her. She tilts her head, seeing them fall for the trap. "Goodbye,"

Suddenly three slashes of fire burst from the Flame Wall. Each slashed through the Wolves one by one they fall like dominos. Harry landed before his Sister, now in the line of sight of the Pack leader.

Harry rolled his Sword over his shoulder, smiling at the enemy. "Welp, that's a few down." He looks over to the Labyrinth Wolves, growling at the two.

The leader remaining Wolves leaps forward, running on all fours toward the Children. They howl and roar, trying to intimidate the two.

"Hey, Shinsha I did my part." Harry's yellow eyes turn to the Pink Slime, standing behind him. "How about you show some of your powers?"

Shinsha smirks, obliging to her Brother's request. "Hai, Onii-san!" She raised her hands, cold air forming on the palms of her hands." Her eyes looked directly at the Labyrinth Wolves,

Just when they leap in the air, ready to strike at them, Shinsha aims her hands at them. "Have an Ice time," Multiple icicles were released from her hands, hurling toward the Labyrinth Wolves.

Each icicle pierced through the tough hides of the Wolves. Each one fell to the stone floor of the Labyrinth.

The Pack leader saw his entire Wolf Pack was wiped out in mere moments by the children. His eyes widen further upon seeing Harry leaping in front of him,

Shinsha held out her hand to her Brother, enhancing his blade to take a cold aura. "Onii-san, here!" She shouted.

Harry nodded, bringing his blade above his head. "HHHAAAAAAAA!" The Arch Mage slashed down at the Labyrinth Wolf, splitting him in half.

The black-haired teen landed near the door, huffing after a rather mild battle for them. Harry looks at his Sister, smiling at their victory. "We did it!" Shinsha cheered.

"Yeah, we did." Harry smiles, feeling like they accomplished something during this. Shinsha rushed over to him, raising her hands towards him.

Harry knew what this was, instinct drove him to extend his hand and high-five each other.

Shinsha smiles up at her Brother, happy that they were able to work together in defeating the Labyrinth Wolf Pack. Her mouth frowns, noticing that she did something unexpected for Harry. "I-I'm sorry, I know you're not used to me yet and that this was unex-"

"I don't mind," Harry admits, placing his hand at the back of his neck. "I-I should be the one apologizing to you." He blushes, unsure what to say after that.

In the background, Albert and Myrtle arrived on the scene. "Ah, there they are." The Chaos Doll points to their Lord's children. "I wonder what's going on between the two. I'm going to check it out-mmm?" She turns around to Albert preventing her to continue forward.

Albert's hand was on her shoulder, stopping her from intervening with the Tempest Siblings. "Lady Myrtle, I believe now is not the time to speak with them." The Death Paladin explains to his fellow monster. "Observe,"

Myrtle's eyes turn back to Harry and Shinsha, not batting a move while they were speaking with each other.

Harry blushed, looking down at the pink-haired girl before him. "I know that we are siblings thanks to our dad. But…I never knew what having a sibling is like." He started his apology to her. "The only person close to that was my-er our decease cousin Dudley."

"He's not the bests person to be with, so….yeah." Harry cleared his throat, getting off topic with this. "What I'm trying to say is that I'm sorry I've been cold to you, Shinsha."

Shinsha nods, understanding her Brother's plight. She too has some things she needs to apologize for. "You're not the only one that needs to apologize." She stated, placing her hands behind her.

"I too need to apologize to you, Onii-san." The Pink Slime admits to the heir of their home.

"Mmm?"

Shinsha sighs, knowing this was the perfect time to say what she needs to say to Harry. "You see after Papa saved me from my self-destruction, I was grateful and happy that stills care for me as his Daughter even what Mama-Izis made me be." The Slime stated.

"This was when you were at Hogwarts, by the time I was told about you…" Shinsha gave a happy expression to the black-haired Arch Mage. "I was happy, not only that I have a Papa but an Onii-san too."

Harry listens to Shinsha's statement, feeling joy from her words. "I've always seen the children in the City playing with each other and caring for one another. Something that I wished that I have." Shinsha continues, looking at her brother. "Now I do, and it makes me happy that we're family. But I do get that you're not too keen on having siblings, Onii-san. I can-"

Harry sighs, finding this a situation that he thought would never happen. "Look, Shinsha. It's not like having Siblings. I just don't like the idea of-Gah, this isn't going how I wanted to say." He groans,

After a few minutes of groaning and contemplating to himself, (Plus with the aid of Raphael) he looks back at the Pink Slime. "How about let us not think of being Siblings just yet." He suggested.

"How so?" Shinsha asked a bit hurt by his word.

"Let's just be friends for now, like…friends that are related, cousins. We can always work our way up?" Harry added, hoping she'd agree. "How's that idea?"

She took a few minutes to think about the suggestion, and thought working toward becoming Siblings was a fun idea; there's one thing she can't let go of. "Can I at least call you Onii-san?" Shinsha asked with pleading eyes.

"Alright, as long you don't overdo it," Harry smirks at his for-now friend.

"Can't promise you that," Shinsha gave a mischievous smirk, something that runs in the family.

Harry sighs, feeling like she will not let this go. "It seems that you two have worked together in clearing the Mobs in this area." The Siblings looked back to where the entrance was.

Albert and Myrtle were walking over to them, "We've watched your fight at a safe distance, from what we've seen you two worked great together." Albert looks over to the Chaos Doll next to him. "Isn't that right, Lady Myrtle?" He asked.

Myrtle nodded, seeing their teamwork and the forging of a Sibling bond firsthand. "Yes, especially with that Spell that Lady Shinsha did while Lord Harry attacked from the side. That's teamwork if I ever see one." The Chaos Doll stated, looking to the side. 'And thank you, Lady Ramiris for that attack.'

"So? Where we go from here?" Harry asked, looking at the end of the hall.

Albert steps forward, reading the area to get a mental view of the map he read. "We're close to the last level of your journey, young master." The Death Paladin informed him. "From there, you'll be facing the Floor Boss hand-picked by Ramiris-sama and Rimuru-sama."

"I see, so we're at the end." Shinsha can't believe that they made it to the end so quickly. It felt like they only just started this task. "Isn't that great news Onii-san?" She asked.

Harry nods, agreeing with his Sister on that. "Yeah, but I got a feeling we're in for a difficult fight ahead." He sighs, can't shake the feeling that their Father would have something difficult ahead of them.

Myrtle steps forward, using Spatial Magic to bring out some snacks and refreshments for the two. "If you don't mind, Lord Harry, Lady Shinsha. I've packed some food for all of us." The Chaos Doll explains. "I figured since you were going to fight in Lady Ramiris's Labyrinth, you might need to reenergize your strength and Magicules."

Shinsha smiles, seeing the spread on the ground. "Yay, food! Thank you, Myrtle-chan!" The Pink Slime thanked the newest addition to their Nation.

"I shall keep guard while you all rest," Albret stated, prostrating his Sword on guard for rouge Monsters.

Harry put his blade away, approaching a delicious sandwich he sees. "Well, I am a bit peckish after fighting those Labyrinth Wolves." He sat down, taking the sandwich. He took a bite, and his eyes widen. "This is good, did you make it?"

"Um, with the help of Lady Shuna. The rest is her work, but the sandwiches are mine." Myrtle blushed; a bit shy of sharing this part of her. "I hope you two would like it." She asked.

"We love it!" Shinsha smiles, turning to her brother. "Right, Onii-san?" She asked.

Harry nodded, "Yeah, it's good. You might have a future in being a chief, Myrtle." He compliments the sandwiches she made for them.

Myrtle smiles feeling proud of her work. "T-Thank you, Lady Shinsha, Lord Harry."

The Arch Mage looks at the end of the corridor, curious about what's at the end. "Onii-san? Is something the matter?" Shinsha asked.

"I'm just wondering, what are we going to face on the last floor. From what I heard from the Adventurers who faced this challenge, they met the Ten Lords of the Labyrinth, and they are powerful." Harry stated curiously about who is waiting for them on the last floor.

Shinsha looks up, remembering the names of the Ten Lords of the Labyrinth. "I know who the Lords are in here, Albert here is with Aldaman. But I don't know who we'll be facing." She looks to the Death Paladin, standing in place. "Do you know, Albert?"

Albert smiles, knowing who's at the end. "Yes, but I'm forbidden to inform you two. You need to figure that on your own."

On the final floor, a brunette woman with fox ears is sitting on her throne, sensing her master's children nearby. "Well…it's about time, get ready you two. I'm ready for what you're made of." She smiles,

AN: How do you like it? Please leave a comment or review.