agree with the answer on the first part of the discharge causes.
but bout the second part of pectoralis muscle to tighten up for uplifting breast, seems to be a joke to me .
looking at the rapid increases in breast, are more likely a hereditary, seems to be your mother may be having the same issues.
if you want upliftment there are few things
1. liposuffling surgery, means removing the excess at certain breast area and re implanting in the same breast changing the contour and shape of breast
2. if the breast is too large, a small amount of liposuction
can help reshapening
3. well, i believe you need to be consulting a cosmetic surgeon. if you are comfortable you can upload pictures i can help u give a brief idea what would be best suitable for you