Both are harmless, because both are cartoons.
Incest is not only relegated to sisters, but cousins etc... all thing's considered, there is a rather large pool to pick from. And they are more readily available (family members; they are close).
Anyways, the point I made was about the attraction, not about whether watching anime makes you want to go out and actually have incestual sex with a family member or have sex with a child irl.
People are fine admitting they are aroused by incest when they get off on cartoon incest porn. They cower and obfuscate when they are asked whether they like kids because they watch lolicon.
@matrix
This girl never watched Oreimo I suppose.
@matrix it's funny how, when it comes to incest, no one makes the argument "it's incest between CARTOONS!!!". Everyone knows exactly what they're getting off on.
But, oh boy, when you do the same for lolicon porn, then it's all "CARTOONS AREN'T PEOPLE, IT'S TOTALLY DIFFERENT, THERE IS NO REAL LIFE ATTRACTION!!!".