...you missed it, this thing with soulmate AU took an insane turn and is now a full story.
If you read The Best Mistake of My Life and If You Stumble... and liked it, I recommend you to follow the link in the comments or find Errare Humanum Est on my profile. It follows the first two installments and the SPN crew is joining in for the ride. It's less flully perhaps, but it has Team Free Will and some more ;)
Interested? Wonderful! Dig in!
Lots of love,
AAM
P.S. - nope, the gif's not mine...