The idea of a Sukuna x reader fic ending is such a wild ride because it depends entirely on how the writer interprets his character—is he the untouchable King of Curses or a chaotic force with hidden layers? I've read fics where it ends in tragedy, with the reader sacrificing themselves to seal him away, mirroring the dark themes of 'Jujutsu Kaisen'. Others take a redemption arc route, where Sukuna's twisted affection grows into something possessive yet weirdly tender. The best ones, though, leave it ambiguous—maybe the reader becomes his vessel willingly, or they both spiral into mutual destruction. It's the kind of pairing that thrives on unpredictability, and that's what makes it so addictive to explore.
Personally, I love fics that lean into Sukuna's canon ruthlessness. A happy ending feels cheap for him, but a bittersweet one where the reader gets under his skin? That hits different. There's this one fic where the reader slowly becomes his equal, trading blows and banter until neither can tell where the obsession ends and love begins. It's messy, violent, and utterly compelling—just like Sukuna himself.