Herbs will not give you D cups. At most, they'll increase one cup size, and even that is "iffy."
Estrogen does a lot more than just give breasts (see my first post), and it takes several months to get the hormones. You could go the "informed consent" method, where you let the therapist know that you know the consequences, and if you find an endo who'll accept that then you'll be given two hormones: an anti-androgen (which kills off testosterone; your body, being male, will prefer T over Estrogen, given a choice, so you have to kill the choice for E to work), and estrogen (pills, shots, or patch, depending on what your endo offers, and your choice).
Once you get on hormones, it takes from 1-4 years to fully develop breasts.
Even with hormones, most MtF's seem to get A cups, a few get B's, a couple have gotten C's, and I've only heard of one who got DD's. So even with hormones, it's unlikely to get D's.
That's just how it is.