Chapter 14 is from Nahuel's point of view.
Stephenie Meyer tells us in Breaking Dawn that Nahuel's mother and his aunt, Huilen, were Mapuche people, indigenous people of Chile & Argentina. Although Nahuel was never actually raised amongst the Mapuche as such, I think that Huilen would have raised him with the foundations of the culture of her people.
You can read more about the Mapuche people at the following places:
Mapuche International Link
Mapuche on Wikipedia
Nahuel's pet-name for Nessie 'Ayun' and the background behind it was taken from this site:
Wolf Lodge
I found it quite ironic, firstly that the site was called 'Wolf Lodge'(!) and secondly that the description sums up to me how I imagine imprinting to be :o).
Here are the pictures that are relevant for this chapter.
The weaving pattern on the pouch:
If you have any questions feel free to post them in the comments section below :o)