Breast Lift for Upper Breast Roundness?

There are mastopexy techniques which manipulate your breast tissue to add volume to the upper pole of the breast but these techniques do not create long lasting upper pole fullness like an implant does.
A small implant at the time of the lift can give reliable fullness to the upper pole of the breast without altering the breast size dramatically. The breast will be larger as you are adding volume but it is distributed differently. If you do not currently fill your B cup breast, you may find you can wear the same cup size but you fill it out.
Be clear on your discussion with your surgeon as "roundness" implies a visible implant whereas "upper pole fullness" is still in the realm of natural.

Good luck with your decision.

Occasionally a breast lift will create upper breast fullness but this is not consistent and has a tendency to drop after surgery.
In order to achieve cosistent upper breast fullness, an implant is the most reliable method. If you do not want to change your cup size, this can sometimes be accomplished by a simultaneous reduction of the lower redundant portions of the breast while and the volume and upper breast fullness created by placment of a small implant