Fics like The Claiming

When Sam saves Dean rather than killing Michael, the hunters from the tear decide that he no longer deserves to be a leader, or an Alpha. Through magical means, two of the others painfully change Sam from an Alpha to an Omega. There is a claiming competition where several Alphas fight for the right to claim Sam, but at the last moment Dean (and Baby) come in and save the day - but he still has to claim Sam, or someone else will.

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