The classic collection of nipple forms reached Chroma!! even when Chroma is an amazing model that can randomly give all sorts of nipples it's hard to control the expected results with just prompt.

Chroma is an amazing model and worked really well with these loras, being able to replicate the different shapes without contaminating the image and with a high success rate, close to perfect.

Mind each lora works better at a specific weight, check the version for the suggestion.