Sherlock is bored as usual. He needs JAWN ACTION for...erm...SCIENCE! Yes. Anyway, I suck at descriptions so just read. Contains Johnlock and rated I don't know because I'm making it up as I go along. Maybe it will get porny ;)

Dean and Cas have been dating for a while now, secretly, but what will happen when Cas' mom and Dean's dad gets married and they become stepbrothers?