Nothing about the relationship is consentual. One is obsessive a narcissist and emotionally undeveloped man child. The other a victim of neglect, abuse, an enabler and his brother's keeper. With their dynamic verbal consent or even nonverbal would never be put in practice simply because since childhood their roles were decided. Of master and slave. One is enslaved to his own brother through obligation, trauma, and forced responsibility and other was given that right since birth. It's complicated but nothing about their relationship will ever be romantic. Nor will consensual sex for that matter. It will always be rape. Because there is zero equality in the relationship.

		
I know this is a yaoi manga but are we just gonna ignore the fact that he keeps raping his younger brother be it half blood or not that shit is messed up don't care if his excuse is cause he has daddy or mommy issues