Hmm, I think you are limited on non-surgical options. The only tablets I know of that can increase breast size are hormone tablets. (Keep in mind that I'm disadvantaged by living in a country that has a wonderful Therapeutic Goods Administration that blocks anything too nasty or dodgy, which means I'm not familiar with lots of things available worldwide. Hang on, maybe it is an advantage )

Problem with hormones are that lots of women experience side effects with them. The transgender guys wouldn't have as many of these side effects. Off the top of my head, they include sore breasts, bad skin (acne due to overactive hormone), heavy periods, intermittant spotting (bleeding between periods), headaches, nausea and vomiting (too much oestrogen), weight gain. If you want more I can pull out my APPG, but you'd only have a slight gain of breast size, probably not even one cup size, and it's mainly due to weight gain and bloatiness.

Maybe someone knows of a topical application or some sort of ....activity that will help.