Soulmate AU!
It's relatively common too. Anyway, everyone has two different colored eyes. They were born with those eyes. They live their life not knowing which one is their true eye color. They meet each other and when they look into each other's eyes, their eyes change to match the eyes they were meant to have at birth.
BONUS: They can't see the opposing eyes color (Ex. I have brown eyes. My soul mate would not be able to see brown.)
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Fanfiction AU Prompts
FanfictionHere is a collection of prompts I found on Tumblr, Google, (Maybe my brain, I don't know, it steals people's ideas too) and I apologize because I can't figure out who originally created the prompt so I can't credit people. If you know, tell me and I...