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1. Proof of Concept by HopelessGeek (wuzzy90) for Blunky

   Fandoms: Yu-Gi-Oh! Duel Monsters (Anime & Manga)  

   • Mature
   • No Archive Warnings Apply
   • M/M
   • Complete Work

   14 Feb 2026

   Tags

   • No Archive Warnings Apply
   • Kaiba Seto/Yami Yuugi | Atem
   • Kaiba Seto
   • Yami Yuugi | Atem
   • Alternate Universe - Canon Divergence
   • Post-Canon
   • Alternate Timelines
   • Character Study
   • Angst
   • Obsession
   • Identity Crisis
   • Grief/Mourning
   • Sci-Fi Elements
   • Slow Burn
   • Mad Scientist Seto

   Summary

   After the ceremonial duel, Seto Kaiba did what he had to. He moved on.

   Or so he told himself.

   Years later, he wakes up in a world where he didn’t—where Atem stayed, and they built a life together. Faced with the proof of what he could've had, Seto must confront the most destabilizing question of all: was moving on ever the rational choice?

   Language:

   English

   Words:

   10,821

   Chapters:

   4/4

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   Comments:

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   46

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