The niece/nephew thing can get very sketchy very quickly if it keeps being done see the Hapsburgs and King Charles II of Spain. I said calling it incest when with a step-parent or sibling for social, cultural, legal reasons is fine. I stand by what I said about dating a step-parent's sibling's son or daughter being fine.It's not only about the blood relation.
It's also about the power and family dynamics.
I agree that the step- thing is often a cop-out to make the kink somehow more acceptable to the payment processors but still.
When it comes to blood relation and the risks of inbreeding, niece/nephew incest is so barely incest that it is fully legal and not even frowned upon in many countries.
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