Shalanocent

(Warning, Big wall of text ahead, fasten your belts, hold on your pants)

Time for a little (innocently delivered) info.

Stem cell, you heard of them right? They couldn't use 'em 'cause their only source was embryos, and messin' with embryos is bad. Now they created them with a combo of HIV (yes, you read it right) and regular cells (from a donor). How? by forcibly transplanting the (or a) caracteristic gene found in canceric cells, reversing the regular cells into a stem cell-like state, that is unlimited and somewhat controllable proliferation.

What do I mean by that? They managed to recreate heart cells by putting these artificial stem cells in an environment saturated with heart tissue. If I remember correctly, they were trying to recreate a full working organ, so while in this purpose the experiment was a failure, they are now experimenting on breast reconstruction by mixing artificial stem cell with fat tissue and implementing it in vivo to reconstruct the breast.

Now this is innocently-given opinion and hope.

While this is EXPERIMENTAL (7 women will be experimented on with this technique, only for breast reconstruction purposes) this is good news! If (big, biblical-scale IF) scientists would finally pinpoint the cocktail that defines puberty, the only lacking part would be stem cells in the breast that would permit the breast growth, and you would be able to access a second, or n'th puberty as you see fit. The presence of stem cells only in the breast tissue/fat in the breast would ensure puberty-like growth only in this area.

Now, that was breast tissue growth... how about fat tissue?

Basical information is that Human body stores glucides (correct word?) in different forms. First is glucose (same?) which is in blood stream and can be used directly. Then there is glycogen (?) in the liver. This is a glucose polymer and is very easy to form and break and is the form that keeps the glucose rate constant, the pancreas (or another organ) serve as a detector for this rate and if it goes below/above nominal, a signal is sent to the liver (one of which is insulin, and lack of functionnal insulin/insulin receptor is the cause of diabetes, of which there are several sorts but let's skip) and when the liver is full , it sends another signal to -sorta- tell the pancreas to stop asking it and rather ask fat cells to proliferate/fill up. However nobody told me how the fat cells were told to grow/proliferate. Now, if we snatched that signal, made it into a cream... wouldn't it be wonderful to be able to massage your partner with it and get two rewards? (the massage and bigger boobies?) (caution, wear gloves, don't apply on the nipple)

However, this doesn't comply with the breast inflation fetish, JUST the bigger-in-the end breast expansion... remember Eiken?
And the back-aching problems.

Edit: I think I should insist on some things.
Lipids (?) or 'fat' in food terms, is a polymer of glucose too. It can be broke with H2O and enzymes and is created by other enzymes, but at a far higher price (in time and effort) compared with glycogen. That's why it's the third and less prefered form of storage from the body's point of view. Also, the signals sent by the organs are sent through the bloodstream, so they are 'broadcasted' throughout all the body just to be caught by the relevant recepters. And fat as we all know has prefered 'spawn points'.

And because of the pancreas/liver system, the emptying/filling/proliferation of the fat cells is commanded on the scale of the whole body... all the people saying they can sculpt particular parts of the body make me laugh... the only effect you can have is breaking fat mass and provoking its relocation because you're manipulating it (principle of massage-based weight therapy). As a consequence, too much massage of breast could make it shrink, but the fact is it is a very weak fat (it's already maleable, and the breast is sensitive so the necessary force is not easily attained), so massaging has nearly no effect, or it is compensated by the increased flux of fat-stimulating message.