I bonk mine occasionally. The biggest nuisance is sleeping. I have leaned to sleep on my side, but once in a while, if I am having trouble falling asleep, I have to sleep on my stomach. I have to roll over to that position very, very carefully, and they are sore when I wake up.
At least now that they are gorwing only slowly, they aren't as tender. When they were growing quickly, the slightest contact was painful, and I had to wear a bra just for protection.
At the end of my daily meditation, when I raise my hands to the 'namaste' position, I have had to alter my habitual position because my breasts are now in the way.