Jujutsu Kaisen: This Is How You Get the Perfect Ending!

[Original story, dual female leads Igarashi Asuka × Nikaeri Ren / GL + Satoru Gojo × Suguru Geto / BL + non-canon storyline / what-if where Gojo and Geto both defect + lots of plot references, with sources noted]

No outline, just writing whatever comes to mind.

The two couples get roughly equal page time (not sure).

Dual female leads, both bking; Gojo and Geto are chaotic, morally dubious fun-lovers.

A story about two couples overthrowing Jujutsu Headquarters and changing the future.

Thanks to Wen Shui Zhu Shu, you are a goddess (hands together).