So Demora is at a 34R cup and looking forward to further transfers if she can solve the bra problem, which I have to imagine revolves around obtaining one past that size or going with custom made. I think the logical sense at this point would be to seek a alternative. The first time I saw one was a slight glimpse in a BustyJenny video; it looked to be a sleeveless t-shirt that had been modified, not necessarily to lift her breasts, but to cradle them at a given height. I had seen similar tops worn by gigantomastia girls, trying to contain more than actually lift and put all that pressure on the shoulders, but Jenny's was the first I saw as a bra like device. Less than two years later, we witnessed Beshine give up her traditional style bras and go with again, what could be a very elastic looking top, that could resemble a sleeveless t-shirt but with thin elastic should straps designed for no real purpose than to hold the garment from slipping down. Now Foxy is using very similar tops as bras.
The difference is purpose. Obviously, Beshine and to a lesser extent, Foxy don't require any breast lift, but they wear these tops to diminish side to side boobie wobble, thus stabilize balance. Jenny indicated her breasts weighed like 96 lbs. so lifting had become difficult, and it seemed she had settled for something cheap as it was obvious that money was always a problem. Cutting away some side portions of the oversized t-shift, it looked to be rolled over to essentially cup and hold her amazingly full torpedo shape at waist level, a kind of muffin top bulge that was difficult to mistaken what they actually were. At this time, no doubt because her breasts hung to pelvic height, she had difficulty standing upright; if she was able to carry them higher and on her chest, she could have adopted a Beshine like posture and found life far easier.
What I would suggest looking into would be the Beshine version. It must be put on feet first, then pulled up, over the hips where it fits the waist to underboob snugly. From that point, each cup is stretched over one boob at a time, before the shoulder straps are placed. In many ways, you could consider it a one piece bathing suit from the waist up. Though this is not a consideration for Beshine, the snug waist to underboob may help hold the weight up, hopefully minimizing the stress placed on the shoulders. The key is snug and stretchy, things obviously missing with Jenny's attempt.
I would think with fat transfer, the added size could be permanent if vascularization is good. And if the fat remain viable, it should go a long way towards retaining a very full and less pliable breast shape that resists drooping. Of course, if one wants to assure that shape, no stretching or ball in the sock appearance for life, and avoid the need for a lifting bra of any sorts, this can all be achieved quite reasonably with the urethane internal bra they developed around 8 years ago and is common throughout Europe. It allows natural breasts to go braless, yet held at a level, thus shape, the girl desires. Last I heart, they were like $1500 plus surgical costs, which quickly pays for itself vs custom bras. Of course, I have no idea if there are size limitations, but I doubt it since they are essentially created on the OR table.