YMMV.Yes, it possible, especially if you're overweight. Just keep in mind that everyone is different. Breast development is a genetic component that's unlocked with Estradiol, not to mention Progesterone. Look at your sister, or mother and as we say in medicine, or flying for that matter-do the math. My daughter is busty, as is my sister, and my mother. Last week, after 30 days on HRT my breasts were so sensitive that I couldn't wear a shirt. Fortunetley, my girlfriend from high school took charge and dragged me to Nordstrom's and announced to the sales people behind the counter, "Bobby needs a bra!" Seeing their confused faces, I told them that I was transitioning and their eyes lit up. For the next half hour I got the best service and two padded sports bras. Ahhh. I even sleep in it. BTW, have an A-cup, but come next year I'm expecting a B or C cup.
Good luck girls.