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Thank you. ^^ Yu Yu Hakusho canon should be my major. XD

HE WAS LYING TO YUSUKE WHEN HE TOLD HIM THAT YUKINA WAS HIS HALF SIS!! ^ ^

*Heaves a heavy sigh* GO READ LIKE 2 POSTS UP!

Actually, given that the koorime reproduce only once every 100 years, how were there two eggs at the same time? I'd think that unless the koorime release many eggs at once, only one of which actually comes to term, that would be kind of impossible without a really strange, coincidental, unlucky circumstance that made Hina release two eggs at the same time. So I think it would have to be a single egg, split, making them twins.

But even that doesn't really make sense. Normally a split egg results in identical twins, but from what I've heard about the koorime, it isn't only because they don't have sex with men that they always breed true. I swear I don't remember from where I get this (probably a fanfic sweatdrop ), but as I always understood it, koorime genes are always dominant and supersede all others, pushing them into recessives and producing a functionally pure-blooded koorime. It's possible that Hiei was the result of another set of always-dominant genes, which might in some strange universe explain a split egg that didn't make identical twins.

I don't know. Don't listen to me. eek

If Hiei and Yukina are true twins (either by a splitting, fertilized egg or by two eggs, both fertilized [see below]) then Yukina cannot be full blooded Koorime. It's true that her dominant genes might make her have Koorime traits, but she's still half blooded in that scenario.

Okay, sorry to get all scientific and gross on you, but:

Guys, being born at the same time does not necessarily (by definition) make siblings twins (and anyway, twins can be born minutes or hours apart, they're never born at the EXACT SAME TIME). While it is true that siblings that aren't twins can't be born at the same time (the nearest would be nine months apart) the very definition of twins doesn't actually have to do with time of birth, since it just depends on the labor time spent for the second twin born. Twins can occur two ways:

1. One fertilized egg splits into two, causing identical twins
or
2. Two eggs are accidentally migrated down the fallopian tubes at the same time, and both are fertilized WITH THE SAME SEMEN and therefore are not identical, but born at the same time. The reason a woman cannot have twins from two different men (unless she had sex with two at the same time...but it's still unlikely) is that the semen will find the egg as soon as it enters the body, leaving no time for a second man's seed to get into one of the eggs, and only one sperm can get into the egg anyway.

Now, assuming Yukina is full blooded ice maiden/Koorime, SHE AND HIEI CANNOT BE TWINS BY DEFINITION. This is because they are not fertilized by the same source, in fact, Yukina's not fertilized at all. As to how they were born at the same time (and to be honest, I haven't seen any proof of that from the manga source itself yet, if you have some post it, please), you would have to study the Koorime's ability to reproduce asexually. I don't think it's similar to humans, otherwise they'd need fertilization or else the eggs would just exit the body in the form of menstruation.

If Yukina is half blood, like Hiei, then wouldn't she be outcast too? And mightn't she also be male? I was under the impression that males can only be born by outside fertilization, however that doesn't necessarily prove or disprove the opposite--whether outside consummation would always end in a male child or whether the child might be female depending on which chromosomes reach the egg first.

I'm assuming that the Koorime have the ability to fertilize their own egg, but only once every 100 years. In that case, either they menstruate like humans except for that one egg every 100 years, or they only release one egg every 100 years that's always fertilized. Of course, there's the possibility that they don't have eggs at all, and have a more flower-like reproduction system, but if that were true then I doubt sexual reproduction would be an option at all. Obviously, a Koorime's system allows for both asexual and sexual reproduction, which is something beyond all my comprehension.

Also, going on what I said earlier, that if there's an egg, semen will try to get in it, Hiei's egg must have been fertilized ONE WEEK BEFORE YUKINA'S WAS EVER RELEASED (unless of course the Koorime egg has defenses against outside forces because it's already fertilized), because (at least for humans) semen dissolves a week after entering the body, and Yukina's egg (if she was full blooded ice maiden) wasn't fertilized by the fire demon's semen.

Anyway, if someone can figure out a plausible theory to the Koorime's reproductive organs, then perhaps it would explain a bit. But for the meantime, they are not by definition twins, but they are half siblings (sort of).

With that knowledge, when Hiei said he and Yukina had different mothers, it was either a MAJOR translation error, or he was lying. He had to be, because if they didn't have the same mom, then they had the same dad, and Yukina never had a father, if we're to assume that she was reproduced asexually. And oh, I just realized something: if Hiei and Yukina ARE true twins by either method, then they're not half siblings. So, in all reality, they're not BOTH HALF SIBLINGS AND TWINS. They can't be if we're assuming what we already have, it's just not possible.

Then again, we don't know the details of demon birth either. Since a demon's very heartbeat is different from a human's, it's possible that their reproduction is different also. Which just throws a whole new wrench in the gears of this debate, thereby killing everyone in this thread. *dies*

Sorry for the terribly long post, if you read it all, congrats. ^^