I think this has possibly become a colossal case of “tell not show”. In fact it’s what a lot of heterosexual couples go through on screen - relationships that pop up out of seemingly nowhere, other characters being like “they’d be cute together” and then they suddenly fall into each other’s arms and nobody bats and eyelid because a) they’re straight, and b) it’s been foreshadowed by things all the other characters have apparently observed. Now clearly we don’t have (a) but maybe the fact (b) is so prominent these days might work in our favour. Maybe this is opening doors for Dean and Cas to get together later on without the writers feeling like they’re ~compromising~ the inherent heterosexuality of the show. Maybe it’s the writers trying to get romantic shit past the producers’ radars, so the producers don’t think Dean and Cas are going to have a chance to engage in visual coitus every week, but when Destiel does eventually happen, it’ll make so much narrative sense that these damn producers won’t be able to say “hey, wtf is this gay-ass shit”. because it’s fucking been building up so obviously that they can’t deny it. AND THEN THEY KISS