Am I the only one that hopes that Mary would like to see her breasts so huge that her sideboobs extend past the arms of the chair while projecting forward to almost her knees? Each little dog would have their own side of a mountainous boob shelf to lay on.
You are not the only that hopes her breasts get so huge. 
Just wondering if she would enjoy having breasts the size of Beshine's.
Well, I would definitely enjoy seeing that. 
Time will tell, but the most important thing is that Mary is happy, no matter how huge she may make her breasts. As I see it, there seems to be a point where girls with expanders make the decision whether they are satisfied with a certain size or if they want to eventually have absolutely huge breasts. From what we have seen, that point seems to be in the 4k-5k range; some are satisfied to stay there, a few just love the idea of having boobs so huge that they will change everything. And if they become so immense that she cannot reach around her own breasts, but must extend her arms over them to reach what is right in front of her, everything does change. If Mary gets that big, I hope that she is excited as Beshine to experience all the enormous boobie adventures.