This is an ongoing attempt to create a checkpoint that responds well to prompting different sizes and shapes of breasts; I've found that many checkpoints, including vanilla Flux, can be very stubborn in what size and shape breasts they want to generate, leading to the need for LoRA's for even moderate changes to their baseline.
This is the first stage that I felt was even good enough to release in order to try to get feedback. It's by no means done/perfect. As of right now, it can adjust size relatively well, but every once in a while it just straight ignores any prompt related to breast size. It can also mess with hands a bit for some reason. I've included comparison images (with this checkpoint on the far left and 3 other checkpoints I use fairly often) using 5 completely random seeds without handpicking any results, I've included them all, including the one where this model changed breast size the least.

Because this is a merge using my LoRA's and a large dataset I curated specifically for this process, I've tried to bake in some keywords and I think they may be working? It will probably take a lot more testing to see if synonyms work just as well and it's not my keywords but Flux's ability to just read natural language. But just in case, here are the terms I used from smallest breast size to biggest:

very small breasts, aa-cups, aa_cups
small breasts, b-cups, b_cups
medium breasts, c-cups, c_cups
large breasts, d-cups, d_cups
very large breasts, f-cups, f_cups

Again, hoping to get some feedback! Thank you!!! ❤️

For reference, prompt used for comparison images:

An ultra-high definition and high detailed professional photograph of a blonde woman professional model visiting a natural wonder of the world. She is completely nude. The photo has sharp vivid colors. She is wearing a tasteful amount of makeup to accentuate her features. She has very small breasts, aa-cups.

With "very small breasts, aa-cups" being changed to "very large breasts, f-cups" for the larger breast version gens.

TeeKay's Prompt-able Titty Mix | Checkpoint Merge - v0.50beta