SUPERWHOLOCK OR BUST BABY!!!
Oh my gosh just imagine. Sherlock would just have to watch Dean for maybe a millisecond and Dean would say something like “yeah right, consulting detective. What makes him so good?” and Sherlock would be like “well in the two minutes I’ve been standing here I can tell you have issues with your father, you still have a bit of jealousy towards your brother, you long for a normal life even if you know it is impossible for you to have, and you are in love with Castiel.” And all their jaws would drop, except for Cas because he’s used to Sherlock’s deductions, and Dean would blush and quickly deny it all and Sherlock would just smirk.
(Source: burning-wings-of-castiel)