You'll get more fullness in the upper pole (a little), but won't get the nipple any higher. You're at the point where that would require a lift. If you don't want the scars, then your plan is ok. Good luck!
If you are debating, I would recommend you do nothing at this time.An implant is going to make you bigger. You are already a D and questioning implants. Even a tiny 200 cc implant ( which is very , very small) will make you a DDSmall implants will have a small diameter and not necessarily give...