Ideally in either surgery you wouldn't want to be lying directly on the operative site. During surgery, one of your surgical sites would be compressed for some period of time in order to do the other. In a perfect world, for optimum results, they would be done separately. That being said, many of my patients opt to have breast surgery and BBL at the same time. I usually do the breasts first and all of the liposuction anteriorly, and then turn you onto your tummy in order to finish the liposuction and do the BBL being very careful to pad the breasts when positioning you on the operative table. I have not had any complications with this technique and patients are happy with both their breasts and buttock. Honestly, you may lose a bit more of the buttock grafts when doing things combined like this, but it hasn't seemed to make a tremendous difference in my opinion. Best of luck to you.