HEX - Nancy Forest-Flier, Thomas Olde Heuvelt

At the low point of his stupor after [...]´s death - at half past one on Monday night - Tyler lay in bed, naked but for his underpants, his body covered with goose bumps and his nipples dark, hard nodules.

[...]

It was as if Laurie was in another dimension, where the images that kept flashing through his mind in a sickening repitition - Katherine´s nipple, [...], the horses - didn´t exist

 

The author likes to mention and descripe the occational nipple. Maybe he wants to emphasise the mental state of the character by doing this. Or maybe he is just weirdly obsessed by nipples.