I was actually thinking the same when I read the raws cause in some versions of omega verse the alpha tends to be loyal to his omega due to the pheromone bonding
But I remember reading an omegaverse manga where the omega little bro got raped by his older brother because of his heat or something
who knows
so many variables
like being twins or something
Perhaps that is one of the reasons the other family members of omegas shun/stay away from them, to make sure that doesn't happen.
Life is stranger than fiction - I know of a girl that was being molested by the dad and brother. They got caught because she ended up in the hospital, and they couldn't stop molesting her even there.
happened to a friend of mine as well except it was uncles
I like Usako and Indigo's combined together. Omegas' heat affects Alpha family members but they do not pair properly once bitten like non-blood related partners do. After all, there are still a lot of unchartered areas in ABO.
Maybe blood related people can't truly became mates or even the pheromones smell doesn't work the same way.. Otherwise an Alpha father/son would just fuck the living shit and bite their own omega relatives at some point...So maybe the uke twin just want his brother to have a proper mate.. ..The 3 of them will most likely end up together but I wish that the uke twin would go out and find his own fated alpha ..but they 3 are cool too;)