This is the script for the rest of the story, for those who are curious as to what I had planned.
I tried to adapt it so that it became more interesting to read, but there are still some notes I left for myself here.
Also, it's not my full complete plan. There were some things I didn't know how to write down in a way that made sense for everyone (for example, my plan for Yuuto's relationship with Aspite's family was for it to be "normal" from a devil POV at first and then moving into a more human POV later). This is more so the main part.
VS Hierophant Arc Continuation
Yuuto and the girls are safe inside Lovers Mansion for two weeks thanks to the barrier Hime (Empress' Candidate) gave them. They decide to use those two weeks to prepare for the next round against Hierophant.
Healing Lovers with Stella and Neith. Their connection to their Arcanas is established.
Miyabi and Miyako oyakodon.
Maybe write other lemons.
After a week, Hinata decides to betray Hierophant's side and goes to help Yuuto. Although Hirono (Hierophant's Candidate) and the others notice her betrayal, they don't try to stop her. Of course, Yuuto's side doesn't trust her at first, but they begin to listen to her after Yuuto makes her a Card and puts the condition that she can't lie or hide the truth from him in their contract.
Now that they have reason to believe Hinata, they begin to listen to her explaining about the contract and plan to kill Yuuto. Now that they had solid information, Lizel and Hisoka began to formulate a solid counterplan.
At this point, Yuuto makes Hisoka into a Card and they do Healing Lovers (possibly Rinne's first threesome). Hisoka's upgraded Brain Washer could also control devils, so they began to work that into their plan to cancel the assassination contract.
Yuuto gets in contact with Seigi and asks for her help. Seigi gets in contact with Ruki, Hime and Yuuto's other allies and they begin to use Hisoka's Brain Washer to make the nobles that signed the contract for Yuuto's death go to the Hiraizumi mansion.
After another week passes, the barrier around Lovers Mansion goes down. Hierophant's team invades, but Yuuto and Hinata had already teleported to the Hiraizumi mansion, where Yuji (Hiraizumi family head) and the nobles were waiting.
Stella vs Barbara round 2. Stella needs to use her wits to beat Barbara instead of brute strength.
Reina and Swordia vs Ken round 2.
Miyabi, Rebecca and Maki vs Sol round 2.
Neith vs Nana. Nana's Root Return allows her to perfectly copy any magic, but it also changes her personality. It seemed like Neith was going to lose against Nana's Top Runner, but she didn't give up. Neith unlocks her second Characteristic Magic and wins with her new power.
Yuuto has to fight Hirono while trying to convince (scare) the nobles into canceling the contract. Hinata helps by getting in Hirono's way.
After a while, the conditions are met to cancel the contract (maybe have Yuuto kill some nobles). And like so, the battle against Hierophant ends.
However, there was still the matter of Hinata's betrayal. She couldn't simply be forgiven, so she was banished from the Hiraizumi family. Yuuto tried to appeal for her return, but the biggest concession Yuji gave was that, if Yuuto became Devil King, Hinata could have children with him and be accepted into the "Yuuto" branch family.
Leaving aside the matter of Hinata, everything had been taken care of and Yuuto and the girls were able to go back to their normal lives. Yuuto was now a step closer to becoming Devil King.
VS Hierophant Arc End
Empress of Lovers Arc Start
Yuuto and the others have gone back to their normal lives. Hime meets with Yuuto again and, now that that matter was settled, they officialized their alliance. They both want to make the world a better place for everyone, and they'd help each other achieve that objective.
At this point, I'd write some more daily life chapters.
Fleminar delivers a homunculus to Yuuto (the plans he gave her in chapter 19). Yuuto puts Tenka Fubu's consciousness in that homunculus and makes her his Prince Card, using the contract to stop her from trying to control his body.
Could make Hime into a Card and do Healing Lovers with her.
Hime showcases her Characteristic Magic (making people be their true selves) by using it on Lizel's mom, allowing Lizel to make peace with her.
The teacher recovers her sealed memories. She begins going to Lovers Mansion to teach Poran and co.
Seigi and Rikimaru sex (possibly get Tenka Fubu involved as well).
Remind characters/readers about the Disasters (yet unexplained "natural" disasters that sometimes hit both the Human and Devil Worlds), since it'll be important to the story now.
But the most important part is that Rumi would convince Yuuto to have sex with her and Ruki after she heard about Miyabi and Miyako. It's here that Yuuto finds out that angels have both genders, and as a half-angel, Ruki also does. Yuuto tries to not let it bother him, but he ultimately can't and this creates a rift between him and Ruki (it's important this happens before some of the SoL chapters so that there's time for the rift to be felt).
After a while, Barbatos announces the next event in the Devil King War, the Halloween Monster Hunt. The remaining Candidates would be divided into groups of 2 to fight each other on October 31st, and whichever side had killed the most monsters would get to give 1 order that the loser must obey. Also, all the participants would have to be wearing costumes.
The fights would be: Fool VS Emperor; Lovers VS Priestess; World VS Magician; Judgement VS Empress.
There would be a chapter where the girls ask for Yuuto's help in deciding the costumes (of course, it would be erotic costumes on that chapter and normal ones on the event). Then, Yuuto and Fleminar have a talk and agree that, if Yuuto wins, Fleminar will become his Card.
Unknown to most, Hime would have noticed the rift between Ruki and Yuuto and asked what was wrong. Ruki tells her the truth and Hime decides to help by taking Ruki to Magician, who used his magic to remove the male part of Ruki.
Finally, it's time for the Halloween event.
Amon (Fool's Candidate) and his Cards (possibly have recruited some of Hierophant's team) all go kill monsters while Fool's Ace, a man called Mysterious Mask (actually Barbatos) fights Emperor. Amon's team wins and he makes Marchosias (Emperor's Candidate) into his Card.
Even though she's alone, Fleminar gives a lot of trouble to Yuuto's team, but they still manage to pull off the win. And so she becomes Yuuto's Card.
Aspite (World's Candidate) thought his battle would be easy, and indeed he had no trouble with Noda's (Magician's Candidate) Cards. However, he was ultimately defeated by Noda himself, who implanted Ruki's angel magic circuits on himself.
Ruki wasn't able to participate and Hime won by default.
Some time passes and Yuuto is starting to get worried about no one seeing Ruki, but then she finally reappears and shows Yuuto she dealt with her "problem" and joins as Yuuto's Card. At first, Yuuto was simply happy to have made up with Ruki and everything, but Rumi was disappointed in him for doing nothing while Ruki changed her body for him.
Yuuto begins to question himself, but Hime uses her power on him, clearing away his doubts. He begins to follow only his lust, not even caring if his partner is someone too young like Poran or the youngest Lizel homunculus, so long as they don't reject him.
He only notices something's wrong after his girls call him out. Yuuto confronts Hime, who decides to tell him the truth about her plan. She doesn't believe the world can be made into a better place with the way people are. So she will use her power to make everyone show their true selves, and Magician's power will be used to remove the less desirable parts.
She tries to convince Yuuto to join her, but he doesn't. She goes away with Magician, and tells Yuuto that they'll begin fixing the world by getting rid of the Disasters.
After telling everything to his Cards, Yuuto decides to go and stop Hime. Over the time he has known her, he could tell that her wish to make the world a better place was real, even if her methods were wrong. If possible, he'd like to stop her and help her do things the proper way.
There is an unexpected pincer attack on the Empress-Magician group, since Amon happened to attack at the same time as Yuuto. Aspite was being held captive because Noda wanted to take his Arcana and become the first Candidate to have owned 2 Arcanas at once, so Amon went to save Aspite to recruit him.
Thanks to Amon fighting Noda, and even killing him, Yuuto had an easy time getting to Hime. Although he could easily defeat her in a fight, that wouldn't achieve his objective, so he tried talking with her.
But, the formula Magician had made to get rid of the Disasters had already been activated and there was no going back. Unexpectedly, a rift in space was opened, and from it, Hime and Yuuto could see the strange being that showed up at the end of the Labyrinth Battle Royale. That being was trying to cross over to their world.
Amon arrives where Yuuto and Hime were. He could use his power to keep that being out and close the rift, but it would only work from the inside, but of course, whoever went inside would die, and Amon made clear that the sacrifice would be neither him nor Yuuto. Hime decides to sacrifice herself. Yuuto didn't want to let her, but he is stopped.
Before going in, Hime tells Yuuto that, if there is a next life for her and they happen to meet again, she would like to try doing things properly with him next time. Hime enters the rift and Amon's power closes the rift and stops the being from making it through. Hime is killed off-screen.
Empress of Lovers Arc End
War End Arc Start
A few days after Hime's death, Barbatos calls Yuuto and everyone else to his room. Once there, Michael begins talking about the origins of this world.
As many people already believed, the world was created by God. The first world God created was the one currently known as Devil World, and there he created the first animals, magic, Michael and the other angels, and even Adam and Eve. Adam received the title of World King, which would later become the title of Devil King.
Centuries passed with everything in peace, God was such a good judge that the people of the time didn't even feel the need of creating laws or anything like that, simply relying on God for everything they could. God eventually created another world, which would become known as the Human World, and some people moved there. As time passed and evolution took its course, the people of one world became known as devils, and the other became known as humans.
Time passed with everything seeming perfect, until one day God simply disappeared. A century passed before he appeared again, but he was clearly different now. The angels didn't know what had happened, but something dark had corrupted God, and he was now trying to destroy the world. The angels fought God and were able to seal him in a different dimension, they were also able to take half of his power in an attempt to stop the world from collapsing without God. That power would become Sein and the other beings that currently inhabit the Arcanas.
They were trapped in the Arcanas because the then Devil King feared losing his power, so he used his magic knowledge to trap those new gods in the Devil King Arcanas, making the Devil Kings and Candidates after him something like demigods.
The angels couldn't help the new gods because they were busy trying to find a way to deal with God. God had prohibited them from learning about other gods and worlds, so the ultimate conclusion they were able to come up with was to kill him and end his suffering.
But of course, this was easier said than done. God kept trying to destroy the world from where he was sealed, beginning what was now known as Disasters, and the angels kept trying to fight him, but all they could do was die one by one. And so the centuries passed until they arrive at 20 years ago, on the war Barbatos became Devil King.
Previous Devil King War Mini Arc Start
Barbatos' story begins not long after his Unveiling event. Barbatos took Rumi as his Queen Card, but he didn't really expect much from her. She was just a good friend of his and having her as his Card would help their families' relations, besides, he liked her, sexually. He did plan to pick his other Cards for their power though.
Unlike Barbatos, who tried to make various events in the current Devil King War, the then Devil King decided that, once every two months, the Devil King Candidates would be put in an arena where they would fight each other. Whoever survived until the next day would get to move on to the next round.
In the first round, Barbatos fought the Temperance Candidate, and in the second round he fought the World Candidate. The war was going fairly well for him, and he had even made a promise to his best friend (Marchosias) that they would fight to the death at the finals.
However, things would go differently in the third round. He fought Miyoko (Miyako's sister and then Devil Candidate). Although he did win, the battle was much tougher than he expected, so he decided to train for some time, since his remaining opponents were the Triumph Candidates.
During that training, Barbatos and Rumi happen to fall victim to a Divine Disaster. That's when they meet Michael, who saved them and told them about God and the truth behind the Disasters. While Barbatos is no hero, even he would have nowhere to live if God destroyed the world, so he asked Michael to train him. Rumi was also using this time to begin to seduce Michael, which would eventually lead to Ruki's birth.
Barbatos skipped the fourth round so that he had enough time to become strong enough to win without killing the other Candidates (as everyone's power would be needed to fight against God). This round would be shown through Fleminar's POV. She would fight Empress' Candidate, who would kill her best friend homunculus, sending Fleminar into a berserker mode for the rest of this war.
Barbatos would come back for the fifth round, but only Marchosias and Fleminar were alive by that point. He fought and defeated them both, but he did not kill them, instead he convinced their Arcanas to give up for them, and so he became the first Devil King to not kill all other Candidates. While Fleminar decided to make the most of her life going forward, the breaking of their promise made Marchosias begin to hate Barbatos.
Barbatos enjoyed his time as Devil King until about 12 years before the main story takes place. A Disaster that simply made an entire city disappear from existence happened, and Barbatos went to check it out. Turns out, that city had been transported to the dimension God was imprisoned in. This marked the first battle between God and Barbatos.
However, God was much more powerful than he had imagined. All Barbatos was able to do was escape with Amon, whom he later adopted, as he saw that Amon's destiny was to become the Devil King after him. After discussing things with Michael, Barbatos decided to begin preparing a new Devil King War, so that Amon, Ruki, Lizel, and the other promising talents of this new generation could help him fight.
And so, once he thought everyone was grown up enough, Barbatos began the new Devil King War. But, by that point, Lizel had already broken her and Yuuto's destiny, which would cascade down, breaking the whole plan that Barbatos laid out.
Previous Devil King War Mini Arc End
It was a lot of information for Yuuto and everyone to absorb at once, but it wasn't over yet. The only remaining eligible Candidates were Yuuto and Amon, and clearly there's no point in them killing each other, so they agree to not do that. But there was still the matter of who would become Devil King.
Everything, even destiny, indicated it should be Amon, but Yuuto didn't want to just give up after everything that had happened. Besides, he felt that, while Amon was right in preparing for the battle against God, they couldn't simply ignore everything else as he was doing. Since Yuuto wasn't willing to give up, the last event of the Devil King War was announced: the last battle would happen on the first day of school after winter break, there would be two towers, one for each team, and the highest floor of each tower would have a throne and a crystal. Whoever got the other's crystal and sat on their own throne first would become Devil King.
Yuuto and his Cards take this time to get stronger. Once winter break starts, Yuuto uses all the knowledge he was able to accumulate to mess with his Healing Lovers Characteristic Magic, turning it into Harem Healing Lovers, and that's what Yuuto and his girls do for the winter break.
As this would be the last opportunity to write lemon-focused chapters, I would basically throw here whatever I wasn't able to write during the rest of the story, such as:
Double oyakodon
Twins + Tenka Fubu (if it wasn't done before)
Lizel + homunculus
And more.
At the end, everyone would be ready to fight, they would be able to use the maximum power of their Arcanas, and Yuuto would now have a mana capacity of 1 million. And so the battle would begin. Here's some of the stuff I had thought of:
Miyabi, Maki and Rebecca vs Aspite
Ruki vs Michael
Stella vs Angie
Hinata vs Hirono
Yuuto (and maybe Barbara) vs Barbatos
Fleminar vs Marchosias
Lizel, Rinne and Hisoka buy time against Amon
Yuuto vs Aspite
Yuuto vs Amon
At the end, Yuuto would win, defeating destiny and becoming Devil King. The day after, Yuuto undergoes the ritual to take the power of all Arcanas. Since the magic ritual isn't optimized for humans, Yuuto ends up bedridden and feeling weak for a week, but he is now Devil King. Though Barbatos would still reign until Yuuto finished his studies in Ginsei Academy.
And so ends this Devil King War.
War End Arc End
Future Arc Start
10 years have passed since Yuuto became Devil King. This would be a short arc, just to show how everyone is.
Yuuto's parents can now just enjoy their life.
Yuuto is now the headmaster of Ginsei Academy and Amon is his vice-headmaster, Fleminar is Yuuto's secretary. Reina and Swordia are new sword teachers in Ginsei Academy. Marchosias is also a hand-to-hand combat teacher now. Barbatos just enjoys life now.
Aina (Reina's little sister) is one of the students of Ginsei Academy now, and Poran was in college. Some of Yuuto's children are also starting to study there now. Specifically, Miyane seems to be the brightest, much to the surprise of her mother.
Stella has quit her work as idol and now works as just a manager. She's now focused on rebuilding the Hoshigaoka family.
Lizel, Miyabi, Neith, Rinne, Hisoka, Ruki, and everyone else as well are all happy doing their own things as well. Some of them work directly with Yuuto, others are just his wife.
Aspite and the others are also still working with Yuuto.
One day, God breaks free of the dimension he was imprisoned in. Luckily, Yuuto and the others had been expecting him for years. Fleminar and Marchosias are the first to fight while Reina and Swordia focus on keeping everyone safe.
Amon and Michael eventually arrive and Amon uses World's power to lock himself, Michael and God in a pocket world. During these 10 years, Yuuto used a partial version of the ritual to take the Arcanas powers on Amon, so he has the power of some Arcanas now.
The two of them fight God for a while, but they still can't win. Michael is killed, but they were able to buy enough time. Yuuto arrived after getting Barbatos. Now, Amon, Yuuto and Barbatos would fight against God together.
Even with all their power, the battle was still hard, to the point where the trio almost died, but they did eventually manage to win. As if in a last moment of sanity, God asked about what he had done during this time. After being told everything, he apologizes and dies.
The trio then come back to the normal world. Although they were seriously wounded, they would eventually recover, especially with Rinne's help. Everyone could now rest easy. (I originally had plans to tie this to an HxH fanfic, so Thanatos would be the one behind God going crazy, but that idea ended up never getting out of paper).
The epilogue of this arc would take place centuries in the future. A boy (Yuuto's reincarnation) was going to class in the future Ginsei Academy. The class he would be watching was about the Devil Kings Barbatos and Yuuto, who greatly changed the whole world around them.
As Barbatos' rule was short, the part of class related to him was basically a summary of the events that led him to become Devil King, how he began to prepare to battle God (the whole truth would have been disclosed after the battle against God), and why he began another Devil King War. The teacher would then call Sein to tell Yuuto's story, and she was basically going to summarize the story from her point of view.
She would tell the students how Yuuto worked his whole life to make humans and devils equal, and to end the discrimination between noble devils and lower-class and mixed-blood devils. How, despite a number of rumors about him being true, especially the perverted ones, he was ultimately a good person. How he worked to set her and the other Arcanas free, and how he abolished the Devil King system to let the Arcanas rule.
After the class, Sein thought about taking the boy who was Yuuto's reincarnation to Ruki (who was still alive thanks to her angel half) to recover his memory. But she ultimately decided against it, she would just tell Ruki about him. Knowing Yuuto's luck, he'd end up finding everyone again.
Future Arc End