I think they should add a Incest tag or I really should read the comments before reading any manga..This is my second incest today when INCEST is my off-limit, one of the genres I hate most..
This story would be good if they were not blood related brothers, and this "blood bond" even doesn't seem necessary for the plot.. They could be Step Brothers and The plot wouldn't change a bit for this & would be more convenient..
Aka no Ori*