Fluffing is basically more to do with unders. If you have implants under the muscle (dual plane) the muscle is restricted and tight holding the implant tight down into the chest.
After several weeks the muscle relaxes more and more allowing the implant to rise with it which then gives you bigger boobs.
Once your boobs have also settled and dropped (which can take upto a year with unders) it gives you a fuller appearance.
Fluffing isn’t a medical term (It’s actually used in porn films)! so nurses won’t understand what you mean. It’s just a term that started to be used on here xxx Hope this helps xxx