I think it's also not as big of a deal since they're both guys. Most of the stigma against sibling incest is bc if they had children, the kids would most likely have genetic abnormalities/defects.
I don't want to be mean but, really?! thats your reason!?
Thank you last anon. I read that first response and was like, "My sister can't HAVE kids, does that mean it's okay for me to sleep with her?" ABSOLUTELY NOT.
I agree with Anon too though. Most of the stigma regarding incest is created by society and propagated via institutions which sometimes include religious institutions. It has a lot to do with Mongoloid children despite the relatively low probabilities. The same way homosexual relationships do not create children. Society will not endorse such relationships.
You know personally I'm usually not a fan of sibling lovers. but I have to say in this case I can accept it <3 I guess it has half to do with the fact that they haven't been with one another for years :) but they make a good couple.