I should really be writing a paper for class right now, but a quick reply to your last point: I think that's called the Westermark effect (sp?), and it applies to any children raised together (like kids in orphanages, etc.) but sibling incest DOES happen, especially as sex play between children. This isn't something that I've looked into much, but I know that one of my fannish friends has, because she's a big psychology nerd like that. XD I actually think that she's working on a post for angstybromance based on some of her research, so keep an eye out for it.
Excellent, thank you! Yeah, the Westmark effect, which would normally be in effect, was overthrown by the intensity of the boys circumstance. I'll look forward to that post, and will probably link to it so everyone can have a gander. : D
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