I love the idea that Dean wants Sam to agree that Cas is like another brother. The third Winchester brother and Sam is immediately like no. Dean is offended because wtf Sam he's laid his life down for us. While Sam is trying to actively get it through Dean's mind that there is already another brother which Dean waves off. And also it's cool that Dean sees Cas as a brother figure he just doesn't have that type of relationship with Cas. Which is the wrong thing to say apparently. Because well why aren't the two closer? What does it take for Sam to consider someone a brother huh? Does only blood count is that why he considers Adam a brother and not Cas? Meanwhile Sam is just sitting there thinking of all the reasons it would be very concerning if he saw Cas as a brother figure.
