O Sole Mio: An If in the Heian Era
Top! Top! Top!
A twisted love-hate relationship between two old-time creeps.
Fills in the background mentioned in the main story (with a few changes).
Based on Jujutsu Kaisen, Baku Yumemakura's Onmyoji, Japanese history, and various reference materials (too many to list). Sources include the official Jujutsu Kaisen fanbook, The History of Japanese Sorcery, Wikipedia, and more.
PS1. There will be headcanons and OOC moments, especially for the big guy (he may not be quite so twisted), because this old bear's writing skills are limited. If you can't accept that, hit the red X!
PS2. Zha Zhen meets the twisted one while he already has a wife and lovers! If you have high standards for emotional or physical fidelity, hit the red X!
PS3. A male character will fail to lay eggs (group chat members have already seen it). If you can't accept that, hit the red X!
PS4. This old bear is fragile and needs lots of comments to feel better. I'm an irritable, overworked office slave who works around the clock, so don't ask dumb questions like who's the top or why he's the top. I'll explode! If you can't accept a top-focused story, hit the red X!
PS5. The male lead is not a good person!!! He's self-centered, with his own set of rules and way of doing things. He's a rotten tangerine through and through! A snake in a lion's skin!! If you can't accept that, hit the red X!
PS6. I have no interest in writing a redemption story. If a character from the original dies, then I definitely did it on purpose by accident. If you can't accept that, hit the red X!
Check the character cards for the pairings! I'm just a fanfic writer who knows jack about Jujutsu Kaisen!!! If you can't accept that, hit the red X!
Theme: Fight fire with fire when dealing with old bastards.