I found a bug, I have no clue if it only exists on android, but if you are to first interacting with either breast (in two hand play) and you pet her head and stop interacting with the breast (while still petting) the opposite breast freezes. Interacting with the non frozen breast unfreezes the frozen breast (interacting with the frozen breast doesn't doesn't unfreeze it) (you will also notice that the opposite breast immediately freezes when petting starts (this also applies to the ear interactions as well)). You can also freeze both breasts, but interacting with either will unfreeze the opposite one.