Questionable Questing

Could make it kind of like triggering in worm. Where while under normal circumstances someone will go through intense training and meditation to eventually activate their aura, if you undergo some extreme trauma or tragedy, during the mental breakdown you can trigger your semblence without training through raw emotion and will power.

Except its Ichor. The darkness of the soul instead of the light. Needing Aura from others infused into you to keep your humanity up. Low humanity doesn't mean your bad. But you think like a Grimm. A force of destruction, like say destroying morals and laws and all that other nice stuff. More lust based than canon kill everything

It could be intesting if negative emotions like anger or sadness build up in someone and if they aren't released or aren't carefully managed and that person has aura then their aura will start to get blacken and start to get corrupted and soon the grimmification can begin.

Which is why you have a Grimm like Taiyang. When Summer started to blacken, Tai would take her darkness into himself while she would give him her light. The balance of the two gods.

Or you could do the old fan theory that I like, where mantle the old colony that was destroyed in a grimm attack was because they were experimenting around with half human, half grimm and that could be the trigger of the story. With Tai's team getting sent down there and getting exposed to it with it only triggering in Tai after the double emotional whammy of summer dying and Raven leaving.

I'm really attached to the idea of the Grimm and Aura dictomy being a core AU element of the lore from the start of history

Balance between the light and dark god like you said. With aura being a double edged sword in the empowered the best and worst in humanity. Kind of like the super solider formula in the captain america movies now that I think about it. Good become better. Evil becomes worse.

I say Lust as a form of destruction with the theme of Grimm being the destruction of civilization but that doesn't mean they are by nature evil. Its they can't stop thinking with their heart and their cock or pussy.
That being said, a lot of people go Grimm to embrace amoral anarchy

If you want to go that path, could make a big deal about the big divide between the cites and wilds with two different cultures embracing the two paths of aura. City obssed with being cleen, not just physcially but in thoughts and feelings. Lots of time spent trying to get rid of negative emotions or thoughts.

If you want to full dystopia with it either make their society as souless as possible in fear of the toxic emotions or just make it to where people have to go to HR style meetings were people talk about their emotions in a controlled enviorment and stay away from toxic words like masculinity and desire.

Lol. To be honest being in stuck as a cog in the souless machine sounds better than the second one was. The second one's too real. Too many fucking companies and governments out there think they can drug people enough with perscriptions, struggle sessions disguised as therapy, cheap consumer goods, and infantilized entertainment,

That people don't notice the declining standard of living from even what our grandparents had. But hey if you don't mind getting a little political you could insert those themes into the story. Show the ugly side of trying bottle up negative emotions just makes a society that still feels them, but goes through great lengths to hide them.

I'd make it a mix of the cities having their problems but you also have good people trying to help with social services while wilds is a fucking jungle of Grimm and the few Aura users in it

Wandering bands of warlords, cults, and outlaws. Occasionally invading and fighting the civilized world and each other. Strong individually, but divided and without the technogical edge the cities have.

Raven and Qrow comes from that. Weirdly Raven is proud of having Aura and not Ichor as a sign of being strong while Qrow likes civilized life. His days however turned into a quest to find the Grimm Dragon Tai Yang and his lost nieces that Tai took with him when he embraced being a Grimm of the wilds vs a domisticated Grimm

Although the question I have is how does Tai feel about his kids? Are they just replacements? Does he love them because they resemble their mom or does he ackoldge their differnt and unique from them? What does this whole relationship look like? Probably not very healthy if Tai was grooming his children to be his brides from day one. lol

See that is the thing. How do you write incest smut stories? What drives it?

Sleep well

I think the best way to write an incest story is have the character's slowly stumble into it. Make it awkward and weird at first as the character test their boundaries and how they feel. It gives good drama, but it also really humanizes the characters and makes it feel normal and natural.

My advice, as stupid as it sound, watch some romcoms, notice some of the classic romance arc's and stereotypes and fit in to the story. It'll help settle the readers since they'll recognize those tropes, and seeing a normal romance on the surface clashing with insecure and darker emotions that incest brings up is a good way to make it feel real.