I try it, ouf very nice work with the clothes that you add and the body, it was prefect Nice Taste of the food !

I found this mod online: https://github.com/IllusionMods/BreastPhysicsController/releases for Koikatsu (KK) and Koikatsu Sunshine (KKS). In the game, press "P" to open the configuration menu, then adjust the "Hips" settings (during h session). Set the gravity to -0.0021 to create jiggling butt effect, it's totally game-changing!