>>2854850What you described, assuming you aren't confused, can only happen if the vertices of the breasts are not weighed to any bones affected by physics, whether due to incorrectly set relationships between the bones and rigid bodies or absent physical bone weighing.
As neither is the case, the tits of this model work if you test it in the intended software, that is, MMD or MMM, although the mechanism is, frankly, bullshit. Try lowering the relevant joint bounce modifiers to prevent it from going full retard or change the system altogether.
