A BBL can sometimes be possible after an S-GAP procedure, but it needs a more careful evaluation than a first-time BBL. An S-GAP flap removes tissue from the upper buttock/hip area and can leave scar tissue, contour changes, and altered blood supply in that region. The key questions are how much usable donor fat you still have, where the S-GAP donor scars are, how the buttock tissues feel on exam, and whether the previous surgery affected the areas where fat would be placed. Fat grafting into scarred or previously operated tissue can be less predictable, and the surgeon may need to avoid certain planes or areas. It is very important to bring your operative report if you have it, along with photos of your result and any reconstruction history. A board-certified plastic surgeon experienced with both post-reconstruction anatomy and gluteal fat grafting can examine you and decide whether BBL, limited contouring, scar release with fat grafting, or another approach is safest. If you are a candidate, safety matters more than volume. Fat should be placed carefully in the appropriate layer, and your surgeon should discuss the specific risks created by your prior S-GAP surgery before proceeding.