I missed this thread until now. I think people were a bit too mean to poor ethanrom.
I mean yeh it's unethical and unusual and shouldn't be done, but saying all those things isn't really going to change someone who's made up their mind.
Ethanrom, I think you started this thread with a wrong proposition, you asked "What should I do?" and because what you do is unusual everyone obviously told you to stop. What you should've done was said something along the lines of "I am a confident guy who's in an incesual relationship with his sister who understands it's unorthodox, but feels proud anyway and there's nothing you falks can do or say to make me feel bad myself". And then most people would just not say anything and this thread would be over and done with. But the point would've been made without any arguments.
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~