You guys are gonna get weirded out by my post, but via another fandom I learned about "queerplatonic." This is when two people of the same gender become partners but don't have sex. Usually at least one of them is asexual and they can perform certain romantic actions such as kissing/cuddling. That is what Hikaru and Yoshiki would probably end up as if this was leading to romance, or fans can ship them in this way.