This prompt mentions an a/b/o idea from the spn kinkmeme about alphas being able to stop the undifferentiated from presenting as alpha.
Sadly the thread died without a link to the original prompt, and the criteria narrows it down to basically half of all spn fic.
Would any of y'all happen to know it?

http://daredevilkink.dreamwidth.org/4501.html?thread=8559253#cmt8559253