This is an addon for BBWVR which adds jiggle physics to the butt and parts of the thighs. The 'jiggle' is tied to the mune_l and mune_r bones so any action that would normally cause some breast jiggle will now apply to the butt as well. The size of the bottoms are linked to the bust slider and will look best near the maximum value of 100 (with the shape changing slightly based on race). Above 100 slider the butt will grow larger and begin to sag while below 100 it will shrink and be pushed upwards. A nude option is included alongside the lingerie version but there are no textures included as this is intended as a last step to be installed after the other BBWVR options. Please note that physics must be enabled and your fps must be capped at 60 in game for this to work correctly (https://youtu.be/IyA0dFl011Q
The mod is available in its own section on the BBWVR modpage (scroll down or click the Index shortcut for the download link).