It's not so much the degree of genetic closeness (and I presume time dilation took care of the age gap), but the "with whom he has shared an intimate mental connection since she was an infant" that is the source of the squick.
I'd think that you'd _expect_ marriage sorts of relationships to arise from the intimate mental connection, and that the Long Range Foundation's ethics board having a bad case of the stupids because so many of the original telepath pairs were twins is the kindest explanation.
So I think it's plenty squicky but not especially for the marriage at the end.
You'd expect, but you'd probably be wrong. See the stuff on intermarriage amongst kibbutz kids. Being raised in close proximity tends to induce asexual sibling relationships, regardless of genetics. I'd expect the telepathy thing to do similar.
The telepathy is not a peer relationship, and not a same-age relationship; the sibling detection wetware doesn't get triggered. (and never mind that probably has something to do with smell.)
You're basically plugging an infant into an eighteen year old. If the infant stays plugged in, they get influenced.
Telepathy is sui generis so I have few expectations of it. You could get Westermarck effect, or you could not. As Gradyon says, no smell, no sight, no physical interaction.
And if it's an "intimate" mental connection... well, how intimate?
no subject
Date: 2014-10-17 09:55 pm (UTC)no subject
Date: 2014-10-17 10:11 pm (UTC)So I think it's plenty squicky but not especially for the marriage at the end.
no subject
Date: 2014-10-18 02:06 am (UTC)no subject
Date: 2014-10-18 02:10 am (UTC)You're basically plugging an infant into an eighteen year old. If the infant stays plugged in, they get influenced.
no subject
Date: 2014-10-18 02:13 am (UTC)"Why shouldn't I poop whenever I feel like it?"
no subject
Date: 2014-10-18 02:19 am (UTC)And if it's an "intimate" mental connection... well, how intimate?