If you look at hentai heroes like this, you'll notice that your breasts are generally drawn way too big.
I haven't seen a girl with a flat chest until now, which I think is a pity.
I have not yet met a woman with oversized breasts, or generally with large breasts, where I have seen women with large breasts is on porn sites!
I think that one is afraid if one draws a young woman with weschbret breasts, that one can then get angry with that.
I personally like women who don't have large breasts.