Be careful when experimenting with nonpresribed drugs ("herbals") to promote breast growth. For instance, anything that can cause breast tissue to grow may also be capable of promoting the growth of cancer cells.
Some non-TS crossdressers do get implants just as women do. I recently read about a crossdressing mayor who had them. It's possible to get some results by using suction devices-- even breast milk pumps-- though the results tends not to last. Some claim that constant wearing of a custom-fitted body-sculpting bra will help reshape the chest tissue into a more feminine breast look. I've tried both of these methods off and on and it does help, but things tightened up again after I stopped for a few months. I think I got from about a triple A to a double. I keep meaning to get my lazy ass back on it again, but it's easy to get off the program.
I'm sure in a decade or two, there will be legit drugs on the market developed based on genetic discoveries that will allow anybody to grow them. In the meantime, exercise caution.
-Lyric
