Author's Note: Okay, one more crossover Omake. This one being something that's been fermenting in the back of my mind on and off again for a while, along with the series being something rarely touched upon but not fully forgotten I believe (This owing mostly to fanfic that I stumbled upon and, while not for me, did nudge me back into thinking of this crossover). Will it hold hints at possible story developments? Maybe, at least concepts will be considered for add on. And now…
Curious Cursed Cube causes chaos
aka, C3 Crossover. Kubrick is here! No, not the movie director.
Minato and Kiyome looked over the sight of their current mission with confused gazes. A giant medal cube with a singular red 'eye' on one side sat in the middle of a room with a nearby observation room hidden behind a mirror, in the room was a table with a walkie talkie and folder.
Kiyome went over to read the contents of the folder, which was an initial report on the cube in question, while Minato stepped closer to look into the red eye of the box. The more he looked into it the more it felt like the box was looking back at him, as well as the aura of negative energy coming from it. Steering on the side of caution Minato called for the power of a Persona that held Null Curse, a sub variant of Null Dark, that was more specialized in the energy the cube was giving off.
"We're suppose to wait ten minutes before going through with any testing, says if we feel anything isn't right with ourselves or each other we're meant to leave the room" Kiyome said as she looked over the instructions given to them in the file.
Minato nodded as he turned to his teacher and examination partner "Do you know much about where it came from?"
"Came across it among a collection of other cursed items during an investigation, anything before that we're currently in the dark about" putting down the file she approached the cube to get a closer look herself "These cursed items can be really dangerous, which is why we have them all in separate areas for testing"
Looking at Kiyome with concern Minato tried to expand the area of effect of Null Curse to give her some protection, inching closer to her as he did so "Have you worked with these types of things before?"
"Yeah, though mainly during larger hauls or when we're short staff, it's more of a rarity for me as I don't specialize in this area too much" she turned to Minato with an encouraging smile "It's something most Tamers have to deal with, even if something goes wrong I'm here to help along with the others outside"
The two continued to make small talk until the few minute waiting time was up, neither of them feeling anything wrong as even if the negative energy was trying to affect them Null Curse kept both Tamers safe, once that was done they went over the list of things they needed to do.
"The corners and edges are sharp enough to easily break the skin, although the grooves along the cube faces are more rounded" Minato said as he felt around the surface of the cube, using Touki to cover his hands to prevent possible injuries "No opening on the sides or the top of the cube"
Kiyome nodded as she took notes "Alright, let's check the bottom before moving on. Need any help?"
"I got it" Minato said as he bent his knees and kept his back straight before lifting the cube so that the side with the 'red eye' was looking up, he felt around the area like he had with the other faces of the cube and getting the same results.
Grabbing several bottles of specially prepared water, treated with dust like substance that allowed anyone to control it so long as they had a will of their own, they poured it over the cube to see if the water could pick up anything they were missing.
"There seems to be a slot here, but it's sealed up tight" Kiyome said as felt around where the slot would be, neither noticing the red eye flashing on the box.
Feeling around Minato turned to his teacher with an idea "I might be able to use a mix of stuff to check inside the box, I can't promise it will work but it's worth a shot"
Kiyome looked to Minato worried as she thought over the idea "These curse objects can negatively affect people's minds, even people with strong could not be spared, even if we're safe from the outside the inside can be a very different story"
"I swear to pull back if I feel anything wrong" Minato promise his teacher, who only agreed to the idea once he explained what he was going to do and made sure she was able to check on his condition as he worked.
With a calming breath Minato attempted to use his abilities to look inside the box, having it spread through out the six faces before focusing on the slot, however he could feel it shaking as he tried to force entry into the slot itself. Putting a little more force behind his efforts only made the movements of the box more apparent, enough for both Tamers to see it move with the naked eye.
Hearing a knock at the door both turned to see a woman in a maid dress coming in with a tray of snacks and drinks "Hello, I was asked to get an update on things. I brought snacks in case any of you are hungry"
"Thanks, this seems like a good enough time to take a break and report in" Kiyome turned to Minato as they both made eye contact "What do you think this cube is?"
"A Tsukumogami, an item that has a spirit of it's own" Minato answered as he traced his finger along the cube's surface, before pulling it back as he wasn't sure if the spirit liked the amount of attention it was getting from them.
Kiyome nodded "Correct, although if this is a curse item it's likely this is a Waas. Basically a subspecies of Tsukumogami that exclusively come about due to curses and negative emotions being placed on them" she looked to the red eye of the cube before turning to the woman in the maid dress "Do you mind leaving the tray here, chances are high if this is a Waas this inspection is going to take a while"
"No problem at all, I'll send a message to those who work in the sentient items department to give them a heads up" the maid put the tray of snacks down on the table and ran off, looking over the tray Minato saw it was filled entirely with rice crackers. Feeling a little hungry he took one followed shortly after by Kiyome.
With a snack in them to help both recover some energy Kiyome left to report in the suspected Waas they had in their possession while Minato waited outside the examination room for her to come back, the student followed his teacher's words and waited for her to come back.
However as he waited Minato heard a commotion coming from one of the nearby rooms, looking over he saw leather straps punch through the doors as something was trying to crawl out. Acting fast Minato jumped into action to help his fellow Tamers, thankfully the cursed item they were dealing with wasn't that bad as it was shortly restrained.
Returning to his post Minato waited outside the room door when he heard something coming from inside the room, placing his ear against the door he could hear something was being eaten. Opening the door to the room two things became very apparent.
One, the cube that was in the middle of the room was gone. And two, a naked girl with silver hair and red eyes was eating the rice crackers left behind on the table.
"Huh?" Minato muttered out, completely caught off guard by these turn of events and considering how the naked girl was looking at him she felt the same. The shocked silence between them coming to an end as the girl unconsciously bit down on the cracker in her mouth causing it to fall, before it could hit the ground the girl grabbed the cracker with bite out of it and held it up in one hand with another cracker in the other.
"You! Your one of those perverts from earlier, come back to feel around my body again! Stay back otherwise, I'll curse you!"
Minato blinked as realization dawned on him, figuring out where the cube went and where this girl came from "Ah, your the cube we were-" he dodged out of the way as the cube turned girl began throwing things at him.
-=-][-=-
After a little while, when things calmed down, Minato and Kiyome sat down with the now named Fear-In-Cube or simply Fear to get a better handle of the situation. Once everything was explained there was the matter of deciding what happens next.
Fear looked between Minato and Kiyome with a hesitate look, even with the warning of her curse possibly affecting them both were still willingly to take her in if she wanted. Still, there was something in Fear's chest that she hadn't felt before. Neither Minato or Kiyome seemed to be affected by her curse for whatever reason, and that made her feel hopeful.
Looking between the two of them Fear gauged their expressions to see-
-Fear's eyes locked onto Kiyome's chest once she turned to her, Fear glared at the bigger girl across from here before answering with a huff "I'll go with Minato, I rather him than cow tits here"
"Excuse me?" Kiyome asked, unconsciously leaning backwards which unfortunately caused a little bounce that only made Fear's glare more apparent. Clearing her throat the professional Tamer sought to get things back on track "Putting that aside, if your going with Minato than we need to go over what you both need to know. Especially the means by which you can remove your curse Fear"
After a lengthy explanation and collecting various supplies that they needed, along with some light paperwork, Minato and Fear left to return the Arisato Residence.
As they walked Bridget glared at Fear as the chimera hellhound would occasionally aim a stink at the Waas, in response Fear would give Bridget a weary look and made sure she was a few steps away from the fire breathing creature.
Minato held back a sigh as he saw how his first charge was acting to his newest charge "Bridget, behave. Fear is one of us now, you need to watch out for your new junior" the chimera hellhound barked back an answer with their eyes never leaving Fear "I didn't mean it like that and you known it, I'm asking you to keep her safe"
"What exactly is that thing anyway?" Fear asked with a slight tinge of fear in her own voice, Bridget turned to face the Waas fully and for a brief moment the chimera hellhound revealed a third eye causing the girl to jump back.
Minato rubbed Bridget's head to settle the canine "Bridget is a chimera hellhound, basically three separate breeds of supernatural dogs combined into one. More of a guardian than an attack dog" looking forward he spotted the house "We're here"
Fear stood for a moment as she took in the size of the Arisato Residence before following Minato inside, copying his movements as she saw him take off his shoes and left them to the side.
"I'm home" Minato called out as he walked in, Fear wasn't sure if she was supposed to repeat the words if they had something to do with tradition but any further thought of that was cut off as she show Bridget grow in size right in front of her as it's one head became three.
Fear lowered her head "I'm, in your care"
[1] Bridget stared at the Waas for several tense moments before shrinking down to her previous size and walking deeper into the house with a smug look, letting out a breath Fear walked into the house and after a few seconds found Minato at a table with a girl with long black hair.
"Oh, right on time. Fear, this is Phis. Phis, this is Fear my newest charge as a Tamer" Minato said as he introduced the two, using Ophis's undercover name of Phis in place of her real one.
Ophis gave Fear a nod but didn't say anything, Fear looked at Ophis for a moment before directing a suspicious look towards Minato "You live with her here, on your own" before Minato could reply Fear-In-Cube pointed a finger at him "Have you done perverted things to here like you and cow tits did to me?!"
"We never did such things" Minato answered without missing a moment.
"Liar! I can still feel how you and her hands roamed every inch of me, I can still feel your breath on me as you explored to your heart's content as you drench me in your liquids seeking to reach the very core of my being!" Fear said, hugging herself.
"You were literally a cube and we didn't know you were sentient, much less sapient, at the time" Minato said with a deadpan look "Also, phrasing"
"So you admit to it!" Fear said as she pointed an accusative finger at Minato.
Ophis tilted her head "Did you like it?"
"Eh?" Fear looked to Ophis "Wha, what does that have to do with anything?"
"Because it seems, interesting" Ophis turned to Minato "Could you show me?"
A blush spread across Fear's face, growing in intensity spreading ear to ear "You want him to feel me up again so you can watch!?"
"I'm happy, if he uses me" Ophis answered, wanting to learn exactly what Fear and Minato were talking about. The unashamed words of the Infinite Dragon God short circuited the mind of the Tsukumogami.
Minato sighs "We're getting really off topic here. Phis, I can't in good conscious tell you what happened due to how it upsets Fear, I'm sorry" Ophis nodded, even if she did have a disappointed pout "I still need to give you the tour of the place, show you where everything is and where you'll be staying"
With those words Fear followed after Minato, her and Ophis locking eyes for a minute before going deeper into the house.
Ophis, meanwhile, made a mental note to keep an eye on Fear.
-=-][-=-
"Alright, you ready for your first day at school?" Kiyome asked as she stood with in the Arisato Residence with Fear wearing the Kuoh Academy girl's uniform.
Fear nodded "Ready to go, although I'm not a real fan of the uniform"
"Is it the size of the skirt?" Minato asked, feeling that the skirts that were standard for the Kuoh uniform were too short. Although he wasn't sure if shorter skirts being standard was strictly a Kuoh Academy issue or if it was more common in this world "Or, if it's the sleeves I could roll them up for you" he offered seeing how the sleeves of her uniform partially covered her hands.
"No, it's the colours" Fear raised her arms and did a small spin "They just don't feel right for me, if that makes sense"
Tilting his head Minato nodded as he tried replacing the colours of the uniform with others in his mind "Point, navy blue and red may compliment you better"
Kiyome narrowed her eyes as she pictured the alternate uniform in her mind's eye before widening them "Hmm, maybe something a bit brighter but I agree with you that navy and red would be better for her. Speaking of which" Kiyome pulled out a folder and handed it over to Fear "Here are your transfer papers, everything you need to know before you start school. Just, when you introduce yourself as Fear Kubrick be sure to mention how you aren't related to the movie director"
As Fear began reading over the information given to her Minato brought Kiyome to the side so they two could talk in private, once they were out of earshot he whispered to his teacher "Are you sure this is a good idea, I know we need to surround Fear with positivity to get rid of her curse but is having her enrol in Kuoh Academy a good idea?"
"This is actually pretty standard with helping Waas like Fear get rid of their curses, having them adjust to normal living along with showering them in positivity really helps any transition, so long as the Waas in question shows self control" Kiyome gave Minato a comforting smile as she patted him on the back "Besides, we'll be there for her if something happens"
Minato frowned "We're both third years while she's in first, she'll be on her for most of the school day"
"Which is why I asked Rias to see if Koneko could keep an eye on her" Kiyome smile never left her face as she crossed her arms underneath her chest "We talked about this sort of thing before, trust me we wouldn't be able to do this unless all our bases were covered"
"What are you perverts whispering about, and what's with that smile cow tits" Fear said as she looked to her soon to be upperclassmen.
Kiyome's eyebrow twitched "Fear, could you please stop calling me that"
"Now I'm kind of worried about how she'll react with the others" Minato said as he shook his head.
"Others?" Fear asked, wondering what Minato was talking about. It wouldn't be until later that night that she would begin to understand what he meant as they had to meet up with the Devils of Kuoh Academy, letting them meet Fear for themselves and to reassure them that she wasn't dangerous.
Later that night, the one known as Fear-In-Cube or now as Fear Kubrick met Kuoh Academy's Occult Research Club and Student council.
Amazingly, Fear restrained herself for several minutes before going off on the breast size of several of the people there with her main focus being placed on Akeno and Rias. Both Tamers were willing to let Fear get it out of her system now, but that changed the second Fear in a moment of frustration reached out and grabbed Akeno's breasts. Minato quickly pulled the Waas off Akeno and put her in a full nelson to help keep the two separated even as Fear struggled to get out of the hold with little result, thankfully the Devils present found her actions more amusing than anything else with the exception of Issei and Saji who watched on delighted at the sight.
However, while Koneko felt a measure of camaraderie with Fear she also felt the hairs on the back of her neck standing up. While she had encounter cursed items before what she felt from Fear, it was something on a whole other level.
She could only hope she was over thinking things, and that with the lessening of Fear's curse the less intense this feeling would become.
As the meet and greet came to an end Fear's thoughts began to drift as she walked with Minato and Kiyome beside her.
"That went as well as I expected" Minato said commented as he reviewed the meeting in his mind, while Koneko did seem a little on edge regarding Fear's nature it didn't seem to affect things too much. Although to what degree the random breast assault factor into things he wasn't sure of.
Kiyome let out a sigh "Really, I'm just glad they weren't offended by the whole cow tits comments. Though I'm pretty sure Hyoudou was ready to get into a debate about the 'greatness of breasts' throughout all of that"
"Can I really be cured of my curse?" Fear asked, the uncertainty in her voice thick as she came to a complete stop. She looked up to the two Tamers with uncertainty in her eyes "You said such a thing is possible by surrounding myself with positive energy, but is it really that easy?"
"It's harder than it sounds" Minato answered as Kiyome bent down to be at more eye level with Fear.
"I can assure you, it's very possible" Kiyome smiled as she took out her phone and showed her a message "In fact, a Tamer I know who specialized in Curses who got back to me saying she'll meet you personally. Along with two Waas under her care who were cured of their curses" standing up to her full height Kiyome added one detail that didn't really matter but felt like she needed to add "Granted, both are Dolls but they had rather nasty curses that they have recovered from so I'm sure they can give you some advice"
Fear expression brightened "Really, I can't wait!"
Later on at said meeting…
"Put me down, put me down this sec-" Fear was caught off as she broke out into laughter as she was held up by supernatural hair that tickled her as the Cursed Tsukumogami found herself in a compromising position.
The Tamer specialized in curses sighed "Kuroe, please put Fear down. She's the one we're here to help"
The formerly cursed Japanese doll nodded as her hair let Fear go and fall into Minato's arms, who gave a thankful nod "It's nice to meet you, I'm Minato Arisato and this is Fear Kubrick"
"Kubrick, Like that American director?"
"Yes, I believe it's a pun due to how Fear's other form is that of a cube"
"I see, you got one of the wanna be comedians to work on paperwork" She cleared her throat before continuing "I am Shiraho Sakuramairi, Kiyome has told me a lot about you. You've already met Kuroe here but my other charge is running a little-"
A crashing sound could be heard outside of the door, the door was swung open as the girl in a maid dress that was present during Fear's examination rolled in covered head to toe in cream.
Shiraho rushed over to the maid "Sovereignty, are you alright, what happened?!"
[2] "I fell on the cake I was bringing over, but I ran when I got a message the Jujutsu Sorcerer you were meant to meet is running late" The now named Sovereignty said teary eyed "He said it was because traffic is worse than usual"
-=-][-=-
"So you carry the value here and subtract it from this to get the answer" Minato said as he helped Fear study for school, meanwhile Ophis was eating a bowl of cereal with her eyes occasionally drifting over to the pair.
Fear furrowed her brow as she wrote down an answer, when she show it to Minato and learnt it was the right one her expression brightened up massively. Eager to keep going she leaned closer to Minato to direct his attention to a random question she picked out, both smiling as the study session that was going well.
Ophis gave the pair a hard look as she felt something strange in her chest, she tried to get another spoonful of cereal but found the spoon was gone with only the handle remaining. The Infinite Dragon God hid away what remained of the medal spoon she accidentally ate and retrieved another one to finish her bowl, doing her best to ignore the bubbling feeling of jealousy growing within her whenever she looked at Minato and Fear studying.
Ophis's grip on Minato that night was a bit tighter than usual.
-=-][-=-
After Fear's first day at Kuoh Academy she wanted to walk around Kuoh Town in celebration of how well she did on her first day with Minato promising to treat her to whatever she wanted as a reward for doing so well on her first day, as they were walking around Fear spotted something in a shop window. The complete collection of Stanly Kubrick's films, curiosity about the man drew both into getting the collection.
As Minato went inside to purchase it, having to wait in line to do so, Fear waited outside. As she waited the Tsukumogami felt something off nearby, something that bickered her closer and drew her into a barrier. A barrier where the Occult Research Club was battling a Stray Devil, as much as a battle as a cat playing with it's food.
The Occult Research was more or less playing with the monster that was once a person, using it as live practice to try out new maneuverers even as it screamed out in pain and fought for it's life. Crushed bones, lacerations across it's entire body, repeatedly electrocuted and whatever retaliation it was able to land was undone by Twilight Healing.
The gruesome bloodied sight before her coupled with the thick scent of iron in the air caused something to snap within Fear's mind, the screams of terror that hung in her memories rang out as maddeningly laughter echoed out as the sky darkened above.
It was only in the last moments before she lost control that Fear realized she was the one laughing, cursed energy erupted from her in a thick pillar that hid her from sight "I have to do it, I have to do it…" the soil beneath her feet absorbed the curse energy before floating up into her open have taking the shape of a cube "Yes. I will do it…"
"What is that?" Issei cried out as waves of curse energy washed over them, he looked over to Koneko who was having trouble standing up needing to lean on Kiba to stay upright. As he looked around for the source of the negative energy assaulting them Issei spotted Fear as the pillar of curse energy condensed into the cube she held in her hand, whatever words he wanted to say died in his throat as he saw the sadistic expression the small silver haired girl now wore.
One that brought back memories of Yuuma, or rather Raynare, after she plunged a light spear into his stomach.
"I'll be able to hear your screams of terror" Fear's movements were stiff for a few moments, as if she were a puppet on strings, before they became more life like as her eyes glowed with a toothy smile "How Exciting!"
"Emulation, Start" beneath Fear appeared a spinning square shaped magic circle, the cube in her hand generating a whip of independently floating diamond shaped blocks "Curse Calling"
It would be a few short minutes before Minato arrived at the scene, having felt the spike of cursed energy as soon as it appeared, when he arrived he saw Fear standing in front of a cursed galantine with the corpse of a Stray Devil pinned in place with it's head at the Waas's feet.
He got closer to see if she was alright, and as he got closer he could hear her laughing "Fear-"
"Senpai, get out of there!"
Minato heard Issei call out to him as Fear turned her attention to him, as she did he was able to see the blood lust that seemed to have overtaken her.
"Mechanism No.19, Man-Perforater" Fear said, her fingers dancing along the faces of the cube she held causing it to shift as the curse galantine transformed into a high powered drill attached to Fear's arm, she charged at Minato with bloodlust clouding her eyes.
However, the closer she got to him the more of the bloodlust in her eyes faded as her rational mind fought to regain control. By the time the drill was close to him Fear came to a complete stop, confused over what just happened before a look of horror took it's place. Just as the cursed Tsukumogami opened her mouth to say something Minato pulled her to the side, just missing what would have been a fatal slash from Kiba.
Minato finally took notice of the Occult Research Club being there, and of the uneasy expressions they all had.
-=-][-=-
[3] Fear was too dangerous and had to be destroyed.
That was the prevailing opinion of the Occult Research Club after they saw Fear enter what Issei called her 'Evil Split Personality' with very little being offered in her defence. But them not liking Fear was not the worst of it, it was that Fear agreed with them as Minato had to stop her from doing anything drastic.
She confided in Minato of her true nature, a tool made to torture and execute people that had claimed the lives of countless people over the centuries. It didn't matter who they were, men, women, children, elderly, wealthy, poor, sick, healthy. All who encountered her met their gruesome end with all the curses and negative energy of such crimes giving consciousness to the item that brought so much suffering, and with that consciousness she understood the sins she now carried.
However, Minato refused to give up on Fear. Even if it meant carrying the sins of the entire world he wouldn't leave Fear alone in the darkness she was born into, seeing how far someone was willing to go for her reignited Fear's determination to be rid of her curse and the dark other self inside of her.
Once it became clear of the events leading up to Fear's 'break' it became clear the trigger for it was the Devil's borderline sadistic treatment of the Stray Devil, the concept of them being people once conveniently forgotten amongst the club members.
When they pushed for Fear to be sent somewhere else, effectively making it so she wouldn't be there problem to deal with, Minato laid his cards on the table as he showed Rias and Sona that boiled down to Minato being fully responsible for anything Fear does and would be made to pay for any wrong doings she had committed.
They quickly back down once they realized how far Minato was willing to go for his charge, so much so they refused to sign or even acknowledge the contract and just asked him to make sure the living cube of torture equipment didn't kill any innocent people.
When asked why he was going so far for Fear Minato shrugged and gave a direct answer.
"Waas gain consciousness from the negative energy and curses people put on them, especially humans, the very least we can do is take responsibility for them. Fear's power was born from an evil please but that doesn't mean she is, was or could be, evil"
Thankfully, after a very rocky bump in the road, the working relationship Fear had with the Devils improved as she did make progress in lifting her curse and controlling the dark impulses it forced on her.
-=-]Timeskip….[-=-
Fear pouted as she looked away from Minato, who scratched his cheek as he thought about how to proceed "I'll be honest, I thought you already knew"
"Well, I didn't know you share a bed with Phis. Pervert, I'll be sure to curse you this time" Fear said as she shot Minato a dirty look "And to think I made breakfast for everyone, I even put the little extra effort for yours before I gave you my gift"
Minato's eyes widened slightly "A gift?"
"Yeah, for helping me and sticking with me. Even when everyone else said that shouldn't" Fear held out what looked like cube puzzle made up of light colours, as soon as he took it Fear looked away with a blush "It's, me. Or at least a part me. I figured out how to split off some of my non-cursed power to make a cube capable of emulation, you'll have access to any mechanism I have now with the possibility to create new emulations of your own" she looked away shyly "I, wanted to give you something to remember me by before I go out and travel the world. And hopefully something to help keep you safe"
"Fear, this is too much" he said as he was taken aback by what Fear was giving him.
[4] She shook her head "No, if anything it's not enough. I wouldn't be here right now where I am if it weren't for you" feeling her face heat up the Waas searched her mind for any change of subject "Oh, by the way I was studying with crow cow tits and managed to make new emulations!"
Before he could ask why his charge was studying with Akeno, or 'crow cow tits' as she had taken to call her, Fear manifested her newest emulation and Minato could feel his eyebrow twitch at what he saw. Especially when Fear became bound in her own creation.
[5] "Akeno Himejima, I am going to have words with you about teaching someone as impressionability as Fear about your particular tastes of sadomasochism" Minato muttered to himself as he tried to untie his latest charge from her current imprisonment. Elsewhere, both Nephilim daughter and Fallen Angel father felt a cold chill go down their spines.
Author's Note:
And thus brings an end to the CubexCursedxCurious crossover omake, something that I toyed around in the back of my head for a while and finally got around to writing down.
Certain other elements of C3 would be present in this crossover as well but more background details that didn't make it on the cutting room floor. That being the organizations of Library Kingdom, a mirco-nation of scientists (Independent), and the Knights Dominion (Independent, but with several members connected to the Hero Faction along with a number of Magician Organizations)
Fear Kubrick, or Fear-In-Cube, was created during the Inquisition. Her creation involving the collecting of other Cursed Tools to more or less create the ultimate curse tool, a Longinus Sacred Gear level Cursed Tool if you will.
In canon Fear's father was a human alchemist but I'm debating on whether her creation was a bit different in a fused DxD setting, like an Angel (Who Fell as soon as the Fear-In-Cube claimed it's first blood, Fear not being born yet) wishing to punish humanity by helping to create something to bring Hell to Earth, or have a god / goddess of curses 'Bless' Fear-In-Cube to up her power level. As for who to use for a benefactor / divine parent there is a Hindu god of Curses Jyestha or, something less potent than, how about the Greek Arae (Female Spirits that the dead place on those guilty of their deaths, which would be a seamless addition)
Of course, I'm incline to keep. the origin of Fear's creation a human thing for story element reasons.
Also, very tempted to add in Tsukumogami (Item Spirits) into other snippets. [FGO's Caster Artoria, Kantai Collection Shipgirls and Terminus Est along with Restia Ashdoll from Seirei Tsukai no Bladedance appear for a moment before hiding from view]
[1] Bridget was 'establishing the power structure of the pack' or in other words making Fear acknowledge her as her superior.
[2] Merely a small throw away line, no crossover with Jujutsu Kaisen, and I'm surprised the two series don't have any crossovers as both deal with curses.
[3] I gave a more general overview of this as it can get dark, while rushing through this section this is enough to get an idea of things.
[4] Eh, basically added in the idea Fear can become more powerful so she can keep up with DxD characters. Nothing too crazy but she can create new emulations, either through scanning something or creating blueprints in her mind, with some new abilities.
[5] In case it wasn't clear, Akeno taught little Fear pervy things. Very naughty things. On the bright side, Fear essentially has an endless supply of none burning wax now with her Emulation ability.