Body (breast) make-up

I'm about to write a story (under "mature" - probably take a week or two) n I'd like to get my techniques right. Basically, I need to know about body make-up, to paint larger nipple-discs for a lady friend with almost non-existent areolae, n which disappeared into her nipples when they became erect. She really desperately wished for larger circles. I thought of: lipstick? blusher? red eyeshadow? red food colouring? Any other substance? All applied with the appropriate brush to enhance the sensations, n possibly with my lover blindfold. Then, in my story, the first she sees of her enhancements would be when she is at the point of climaxing from being petted. Then I'd whip off the blind fold, so first she looks down, then ahead into her dressing table mirror. Would that be an enhanced effect, or what? Any advice welcome and much appreciated, especially from actual experience.

Tattoo.