When you exercise to get a bigger butt how can you make it fat instead of muscular?

okay that is a good question. sorry to tell you this but it is all in your genes. there is no way to pick the spot on your body to gain weight in. if you dont naturaly gain weight there its not possible to only make that spot get fat. i understand that excersise doesnt always sound very apeiling however it works. youll have to do workouts for your but to make it bigger and firmer.