Yeah, they did turn out a bit prominent and not that well-placed. Never noticed that the Royal and Kiawe did not have any nipples, though. They both have rather defined pectoral muscles though, which does help hide their lack in a way a "smoother" body like the protagonist's does not.
No offense taken, I probably should redo that part, make them more subtle while also optimizing their position a bit. With the girl, I had the shape to guide me a bit, but boys have less detail in the chest region. And honestly, I have never paid so much attention to nipples before, I just noticed how far to the side they tend to be on skinny bodies.