Like Beshine, she has fallen in absolute love with huge breasts. She wasn't born with huge breasts, she has acquired them, and she loves giant breasts in spite of their difficulty. I fully appreciate her fantastic look. 
Indeed, I would just love to witness that point when a girl suddenly realizes that 3500cc or 5500cc is not nearly big enough, that she wants absolutely enormous boobs. It hasn't escaped me that these girls started out flat, with obvious boob envy; Beshine even cited a few big boob models, like Lola Ferrari that inspired her to get implants, aiming at a goal of 3000cc, maybe a bit more. But once she got there, she realized that she wanted a lot more, and I think Mary has realized the same. Her journey to this 5500cc point has been slower; at 3000cc, she was not talking about wanting enormous boobs, but something snapped in the past year of being at 5500, which is about the limit of her expanders, and she now craves living and experiencing life with 20,000cc boobs.
If I remember right, I think she posted 18 pictures/gifs yesterday on OF. Her boobs are so round, the skin smooth, and the areolas not only stretched large and round, but still pointing higher than a 90 degree plane that one might expect. I hope that she will find that medical device company that can make her the implants of her dreams and that, like Beshine, she has them secured to bone with a internal bra so they will always be high on her chest, never sagging, and always looking huge, round, and fake, just like in her dreams.