Since Gen to me is perfect for the villainess/regressor genre, here's another AU idea by yours truly. ABO and regressor edition.
First life (very heavy themes, as mostly is with these types of stories, novels anyway)
Gen's parents, both betas, have always been ridiculously anti-Omega who thought omegas were only good as bargaining chips. An opinion that's very much in the minority, and also going against everything King Byakuya and Queen Lilian stand for.
Once Gen presented as an omega at 7, their already small amount of goodwill became nonexistent. They start treating him as a maid and a way to let out aggressions.
The credit for Gen's ideas and achievements is always given to Gen's beta older brother, a guy who's so stupid he can't even organise a piss up in a brewery or scheme his way out of a plastic bag.
When he's 11, his parents go into debt, so Gen is sold off to Ibara as repayment, to become his nephew Mozu's plaything.
In order to escape this, he tries to run away from home and winds up at someone's vacation home. There he meets a precocious 8 years old boy and his two very enthusiastic friends. The boy's parents let him stay with them for a while. The entire time he's there, the boy keeps following him around or dragging him to help with his experiments. Gen chalks it up to the boy's parents always being away for business and him being a bit lonely. Though the nuzzling into his neck, close to his gland, is a bit much.
He has three carefree years living in that vacation home until he's noticed by one of Mozu's men, kidnapped and brought to Mozu's castle at 14.
Mozu chains Gen's neck and feet to a bedroom wall. The chain looks delicate but is in fact very sturdy. It's long enough to move around in the room and the ensuite bathroo but leaving the room is impossible. The only good thing about this is that Mozu's family tradition dictates that one can only mark an omega once that omega is pregnant.
Gen befriends Amaryllis, Mozu's sister and another omega stuck in this cage, though hers is of another making, but with the perk of going into the garden. He regularly asks her to bring him various plants and flowers. Says they're his favourites when in fact, he uses them as birth control or as hallucinogenic incense so Mozu doesn't touch him, while imagining he did.
After five more years of this, the castle gets stormed by Ishigami kingdom's guards. Gen and the other omegas are freed, healed and brought to the palace to give their statements. When it's Gen's turn and he looks up at the thrones, he gasps, seeing the scientist boy's parents sitting there. Since he was always hidden from society, he didn't know the faces of the royal family before. And the names they told him before were aliases.
He gets placed to live with StanXeno and their adopted daughter Luna as Xrno's secretary. At first he's terrified because the Snyder-Wingfield household was known as a viper's nest full of villains, who somehow wormed themselves into the queen and crown prince's good graces. But these so-called villains are better to him than his parents ever were. They even adopted him after a few months. He finally has a family that gives a damn. Yes, they are morally-fluid, but for the people they go after are the ones
Also, after a bit of time of getting bombarded with Senku's presents and attention, he finally agrees to be courted by him.
Though that pocket of happiness doesn't hold on long, either.
It starts with the deaths of princes Ryusui and Sai from the neighbouring Nanami kingdom. They're assassinated during a diplomatic event hosted by the Ishigami kingdom.
Due to the circumstances and the message it sends to the Nanami royal family, a war declaration comes promptly. Even though everyone, including king Nanami Arata knows his queen ordered the assassination since both princes' claims to the throne have grown stronger than her own children's.
During that war, Stanley is sent on an assignment together with Gen's birth father, during which the birth father betrays them and feeds the other kingdom information. In exchange, once this war is over and the Ishigami royal family vanquished, the Nanami queen will gift them the Ishigami throne. Stan is killed by the traitor after that POS gloats how taking in Gen was their worst mistake and how after this is all over he will be back in his place. Though it comes at a heavy toll since the Nanami kingdom soldiers are all either killed or succumb to their injuries soon after Stan's death. Including Gen's birth father, who a dying Stan mutilates while still running on fury and adrenaline.
While this is happening, rumours are spread that Luna was the one behind the princes' assassinations. Since they died without visible wounds, Luna is a doctor and she and Gen spent a lot of time with the dead princes. Leading to her being attacked. She succumbs to her injuries.
Gen is then captured by Nanami kingdom spies, one of which being his birth brother. He is then kept in a cell, SAd and beaten while his brother periodically comes in to tell him the news about who else important to Gen was killed off.
Xeno, believing everyone he loves to be dead runs away with Senku while Byakuya and Lillian create a diversion, during which both perish. This leads to the Nanami kingdom celebrating victory and instating Gen's brother as king.
The Nanami kingdom's king, panged with regret of what he has done, tries to help Gen escape. They get caught and are tried. Gen for fleeing from imprisonment and the king for treason.
While his brother, the new Ishigami kingdom king "generously" allows Gen to plead his innocence, it's just a sham since the prison guards removed his tongue days before as per the king's orders. So speaking is impossible. He's sentenced to be tortured within an inch of his life for 10 days. If he survives, he will be moved to the Abbey to live out the rest of his life in solitude. He barely survives and is sent to the hospice.
While there, he vaguely hears how the Nanami kingdom castle is blown up, killing the queen among others. Then a week after that his brother is publically humiliated and killed off.
In the hospice Gen gets to know Ukyo. Another patient who's been poisoned with a slow working poison and ignored by his husband in favour for said husband's affair until the chance of healing became nonexistent.
Ukyo is suffering through the poison's effects and can barely move. Both he and Gen know it's the end of the road for him, but he says he can't die yet. He is waiting for a letter from his husband.
Every Wednesday Ukyo throws hopeful glances at the nurses bringing letters to the patients, only to despair when it becomes clear that there is nothing for him yet again.
Tired of watching this go on, Gen one evening writes a letter to Ukyo in his husband's name and hides it in that week's pile. Since Ukyo is by now too weak to see properly, a nurse reads the letter to him, with Gen holding his hand and silently crying because he knows he's deceiving his friend.
The next day, Ukyo is found dead in his sleep, with the calmest smile he has had since being brought into hospital.
Gen, knowing he's also about to die, flees the place. His goal? To see the bastard who let his precious friend die without ever even visiting or writing a single sodding letter. When he sees him all carefree and fooling around with his mistress at the beach house Ukyo got from his grandparents and talked so fondly about, something in Gen breaks. He drugs the mistress continuously for days into getting a heart attack and manipulates the surroundings to get the unfaithful husband to commit suicide by hanging. The moment his neck snaps, a vial also falls out of his pocket and rolls up to Gen's feet, who picks it up carefully. It has the same poison that killed Ukyo. Knowing his friend's murderer is no more, Gen then collapses due to his inflamed injuries.
The last thing he sees are the blurry shapes of something coming towards him. Though he dies before whatever it is gets close enough to see clearly.
(The shapes are Senku and Xeno running. They spent a few months managing the chaos killing the imposter left behind, until they came across the decree that told them what happened to Gen. Though when they arrived at the hospice, Gen has already fled.)
Gen wakes up again in his 7 years old body, lying on the floor. He can remember the exact moment he is brought back to. It's after the first time his parents whipped him for spilling a big cauldron of hot water on the floor. A cauldron they told him to get off the fire with his hands, despite how heavy and hot it is.
"What's the point to bring me back to this moment? I thought I could finally rest... Must I suffer through everything all over again?"
While looking around the room something catches his empty eyes. It's a newspaper, with a photo of Xeno and Stan on the front page. 'The villainous Dukes of Cinderfall strike again'. He remembers how his birth family called him a villainess for being an omega in his old life. Even made up rumours once he became a Snyder-Wingfield about how horribly manipulative he was.
"Villains, huh? Well, if I'm supposed to be a villainess, I'd better learn from the best." He stands up with difficulty and picks up the newspaper. Looking at the picture, he says: "I'll make sure to save you this time. I promise." With that declaration and a look at the grandfather clock to assure himself it's late and everyone should be asleep, he tiptoes through the home to the back entrance and leaves through the doggy door that is never used since they have no dogs.
He finds his way to Cinderfall, the StanXeno residence with ease, since that's where his heart decided his home is. On the way there Gen is busy readying his pitch. The thing that will make sure they take him in.
That's what I've got so far that's actually thought out.
Though the idea for second life so far is that Gen isn't the only one who remembers the first life. Two more people do. One is Xeno. The other is a mystery for now. (Not Stan or Senku).
Xeno deals with the birth family early on. There will be no chances for them to take his family from him again.
SenGen meet even earlier this time around. Senku is still the best at monopolizing Gen's attention.
Ibara still tries to cash in the debt payment Gen's birth parents promised him (Gen). Only to encounter two apex predators much more dangerous than he is. StanXeno make sure to straighten him out like a piece of wire. Kidnapping Gen doesn't work either. It only brings him and Mozu closer to destruction.
While Gen searches for Ukyo to make sure he doesn't marry that asshole from his first life again. He finds him already engaged and manipulates the POS and his mistress into attacking him to make Ukyo aware of who exactly his fiancé is as a being. After that he sets his friend up to meet prince Ryusui and his overly capable butler François, who has very keen instincts. Ryukyo hit it off and become a pair.
Luna meanwhile gets asked by her brother to help heal Ruri, Senku's cousin and Gen's friend Kohaku's older sister. While there, her and Kohaku start a friendship that turns into a courtship after some time.
Gen befriending the Nanami princes, being betrothed to the Ishigami kingdom's crown prince and foiling her attempts again and again makes the Nanami queen put a target on his back. Good, because he's had a target on hers for a long time.
snowghoul
blakekathryn
romaincrisis
andulkaphoto
titsay
gummygunk
stormborns
