just posting to say that NGM Petite is not for large breasts, but does require NGM.  even NGM isn't technically for larger breasts.  it's for applying realistic, parallel to the body gravity morphs (as opposed to NBS, which is under development, and for gravity morphs due to movement).   they go to pretty large cup sizes, but iirc, it's supposed to be about B-DDD.  that's kind of a debatable sizing because we're not talking about a real woman, and as far as i've seen from people's posts, there's a pretty wide range of people's estimates of cup sizes on these figures.  i will say they look pretty large to me, but then i haven't used them alone and tried to get them to work with V4's other morphs to make smaller cup sizes.  i've only used NGM Petite so far.  those I can say would probably do what you want to at least A cup.  look carefully at the promos and Posermatic's gallery and see what you think, because you would need to purchase both NGM and NGM petite. 

i'm tagging this post with nudity due to linking to Posermatic's gallery, which holds nudity.

Posermatic's Store
Posermatic's Gallery