We’ve all discussed the notion that Keith (my precious boy) telling Shiro that he is ‘like a brother’ does NOT actually mean that he literally sees him as a brother and that we’re all shipping a gross, incestuous ship. It’s valid way of expressing to someone that the bond you share with them transcends friendship, without negating the possibility of romantic involvement.
He never had a family. He doesn’t know what it’s like to have a brother. I think that in the heat of the moment, when forced to quantify the depth of his emotions for Shiro, he clutched at the term 'brother’ because maybe that’s what he always imagined having a brother would feel like.
He knows that Shiro means more to him than ANYONE ELSE IN THE ENTIRE FUCKING UNIVERSE! But does he even realise here that he’s in love with him? That would be another common romantic trope that could be applied to Sheith.
He’s also still young. I’ve mentioned before that I don’t think the age gap is an isssue (for starters they’re both adults. It really is ok) because Keith (my precious boy) is an orphan and kids who grow up in difficult circumstances are typically more mature, but come on. I know 30/40/50 year olds that have trouble articulating and expressing their emotions.
I also think that Shiro (beautiful, pining Shiro) is waiting for Keith (my precious boy). He knows that he is more mature/experienced/knows what he wants (KEITH. HE FUCKING WANTS KEITH OK!) and he’s giving Keith (my precious boy) time to figure out what he wants….he’s kind of frigging self-sacrificing that way….
…..also they’re fighting a war. With the blam! blam! and the pew pew and the giant fucking robots.