I have named this dead fish "Incest" and I'm going to slap everyone's face with it: INCEST!
*slap slap slap*
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-Is incest morally wrong? Thppt, morality. Bwahaha. Is someone's mating with a close relative messing with someone else? No, than no one should care.
-In the case of no possible offspring? Again, is this really bothering people who aren't involved?
-With offspring? Oops, now we've got an issue. If the child comes out fine, then that's fine. But if the child comes out with mental or physical deformities, then they become a burden on the society they're a burden to society and now you're effecting other people with your perversion. Sure, that can happen with two random people, but not anywhere near the chances close relatives have. Methinks you should look into the ancient Chinese art of Vasectomyfu if you want to boink your sibling.
-Should incest be legally banned? >.> I'm sorry, are they killing people with their weirdness? Stealing money by sleeping with each other? Harming innocent people by privately doing stuff in private? No, we shouldn't take legal actions against consenting adults doing their own thing.
-Does the act of incest disgust you? Actually, not really. At least, not more so than other people having sex. No, I don't care. They're people who are attracted enough to each other to stick bits of each other together, I don't see a difference between relation and not. Except for the offspring bit, but that would just mean I'd find the offspring gross.