it would be very helpful if you provided photos for an assessment. Fat grafting is a wonderful alternative to implants and provides a very natural look to augment the breasts.
Yes, you can have fat transferred to your breasts without the lift. Many surgeons do prefer to do the lift at a separate session to help insure better fat survival. The fat will help give you more fullness, but the lift will make your breast perkier. I would suggest meeting with a board certified plastic surgeon and discussing all your options.
Hello,If you are hoping for a modest augmentation them fat transfer is a good option. With one to two transfers you can expect a 1/2 cup to possibly a full cup increase in ideal situations. If you are desiring a lift, I would suggest having your lift first and waiting at least 3-6 months before proceeding with fat transfer to try to ensure the greatest amount of fat viability. A lift will disrupt the normal breast blood supply in most cases and will initially be higher than the final result. By waiting you ensure the position will be good and you allow the blood supply to reestablish itself. It may be possible to do some fat grafting into the muscle beneath the breast at the time of lift and combine the procedures but this would best be determined after an examination. I recommend talking with a plastic surgeon with experience with fat transfer to the breasts who can best help you achieve your goals.
Best of Luck!