A BBL after butt implants can be possible, but it is a more complex situation than a standard BBL. The photos show an existing implant contour, and the key issue is whether there is enough safe soft-tissue space and enough donor fat to add volume without disturbing the implant pocket. You should be examined by a board-certified plastic surgeon experienced with both buttock implants and fat grafting. They may want imaging or operative details to confirm implant position, capsule condition, and whether there are signs of malposition, rupture, infection, or capsular contracture. Fat should be placed only in safe tissue planes and not into the muscle or implant pocket. If the implants are too superficial, poorly positioned, or causing problems, implant revision or replacement may be safer than simply adding fat.