Non-surgical/non-estrogen options for MTF breast enhancement?

I'm MtF, though I haven't actually started the transition process. The primary reason is because HRT renders you irreversibly sterile and at this point in my life starting a family is more important to me than transition. I would, however, like to get a jump start on breast development. I'm currently using prostheses in a mastectomy bra but I'm tired of "taking off my breasts" at night. Are there any hormonal treatments that won't render me sterile?

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