Not quite massage. Not noogling or cupping. Nothing too aggressive either.
Simple grabbing with ones hands...grasping, as if it promote the desired shape.
I've been doing a bit of this...not a lot. Even when not taking PM. Call me crazy, but I think it's doing more than simply waiting for them to grow.
I love breasts, and in prior long term relationships with women, I swear the attention given somehow resulted in their coming to life and being bigger.
Never paid attention to mine till now. Lets see how they respond.