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(Yes but I don't have Cas anymore.His file isn't on my current computer.
Ok so this is my favorite Soulmate AU ever. Ahem:
Whenever your soulmate sings, you are forced to sing with them. No matter where you are or what you're doing. This leads to you just randomly bursting into song at random moments, sometimes inopportune. When two soulmates finally meet they sing a perfect duet together. After this point the random singing stops.)