What is muscle mass relationship with plastic surgery?

In an attempt to get a bigger butt I started hitting the gym... A LOT. As a result, I gained an immense amount of muscle mass especially in my thighs and butt, which makes them much bigger than before. If I were to get a bbl I wouldnt want to have skinny legs and a big butt, but Id most likely stop going to the gym because Id already have what I want. This means Id lose the muscle mass. So how would the doctor forsee how much fat to put into my thighs so it looks good once that happens?

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