Hello, thank you for your question. Technically, both procedures could be done at the same time. It is not recommended, because your breast will sag after you loose a lot of weight, even if you don't have a lot of volume, the best thong to do is have your granitic sleeve, and then think about your breast surgery after you loose all the weight and stabilize in a given weight, if you do it before, you will definitely have to do a breast revision after loosing weight. Another problem is mixing a gastrointestinal procedure with a clean procedure like a breast augmentation, and there could be a risk of infection afterwards, so don't put yourself at risk. Hope to have been helpful, good luck with your surgery