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(Y/N) grew up with dean and Sam. Dean and (y/n) we’re each others first everything úntil Dean ended up with the mark of Cain and then became a Demon and marked (y/n) as his mate Sam doesn’t know about the mate bond and (y/n) is going into inheat. (Y/n) tries to get Sam to let Dean free without mentioning the mate bond but he won’t listen to reason. Úntil (y/n)s in heat makes Dean finally break free