Trait: Darker Nipples (Pregnancy)
This character nipples becomes darker during the course of the VN due to pregnancy.
It’s pregnancy hormones that are responsible for changes in the color of the nipples since they stimulate a temporary increase in the amount of melanin your body produces.
Do NOT use this trait for random dark nipples, it's related to pregnancy only nipple darkening.
NSFW Example Before Darkening 1, NSFW Example After Darkening 1
NSFW Example Before Darkening 2, NSFW Example After Darkening 2