I wouldn't be bothered if they were blood related but did know I mean man, you grow up together as brothers, you're brothers. Do as you may but don't pretend it's not done with an incest mindset
Basically pseudo incest, it's pretty disgusting. Author could've easily made them like childhood friends with a short age gap but no it had to be incest one way or the other, honestly though the prequel would be good but it's just incest trash.
Absolutely beautiful and touching im in tears. dont see why it was tagged as shounen ai but if they were a guy and a girl anyone would assume they're inlove so...
I loved seeing them grow (and I loved how it stayed pg until they were grown!)