Roxas and Ventus are 'enemies-to-sworn-brothers' coded. I just know it.
They are like two cats meeting for the first time: staring at each other from afar, studying each other's every movement, wary, slowly getting to communicate in their own weird ways, getting close, closer and then BAMM! Before you know it, they're sleeping comfortably on each other, wrestle, text weird shitty memes to annoy each other, draw (roxas) stuff on the other's (ventus) face while he sleeps (which is more often than not because he came back as a narcoleptic or something), train together to create some sick combo moves.