beepboop1 one she hasn't been shown to have mental problems(even with out them love can make you crazy and even people born though non related member can have mental problems so stop blame incest) two, incest doesn't make people a yandere that is more how they are raised or there environment they are raised in or even for no real reason or cause for people to be like that(though rare for there to be no reason or cause but incest isn't one of them).
An it hasn't even been shown if incest has side effects, this is a magic world which could make the physical laws different or they might have a magic that prevents the side effects or removes them. So you and everyone else stop blaming incest when we know to little about the world(from what was been shown so far there are no side effects and the sister being a yandere doesn't count)(you people are really making shit up, yandere being connected to incest, really!!?? that is one of the most ridiculous things i have ever heard)(but what should I expect for either incest hater or incest phobias)(you all need to remember this is a fiction meaning real world logic or rule don't apply so you can only use what you have seen in the story and so far they have not shown any incest side effects)
