I failed to mention that the video where the gif is from, is on the former Luna Mons Official channel (now MotoRuss Foster). On the vid it is also mentioned that some kind of explanation about what has been going on with Luna's breasts may be forthcoming. Perhaps we will find out if she has had the same implants all along, and just reduced size temporarily for what ever reason, or if she has new implants and has only recently been able to start filling them again. Clearly she is bigger now than in the photo I posted earlier, so she seems to still want a grand bust.
Hopefully we will find out, and she will be healthy. 
I have to assume she is healthy, just like I have to assume she has a internal bra holding her implants so high, and like others, the bra was likely placed for a presumed volume less than what she ended up with, which just pushes them higher since the additional diameter cannot go lower. I just see her increasingly become involved with weights and how her sideboobs limit the exercise.
In one of her videos, while Foxy was talking about going bigger, Brandi was saying she was happy with her size but would likely reduce in the future, while Luna seemed to have limited expansion interest as I remember. The three of them displayed different attitudes from my perception;
Foxy deeply wanted much bigger boobs, I have to imagine to attract even more attention because she never mentions personal things.
Brandi was happy with her attention but seemed to think the size impractical for normal life.
Luna seemed satisfied with the overall experience.
Boob size is all dependent upon what you want out of them and what you get from any particular size IMHO.