if i remember correctly there is a way to win bigger breast that is just theory btw but by massaging them evryday for a long period stimulation will result in more sensitive and bigger breast.
My gf is trying it with the support of a lactating hypno files she as started a week ago no result yet but i love watch her laying in bed and massaging her breast find it really enjoyable.
plus she is positive her breast are more sensitive than before.