2
Least unrealistic boob physics
(i.imgur.com)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
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I'm guessing her character model gets repositioned slightly for the cutscene, which to the boob physics system reads like she just moved at Mach 2 with inertia to match. This also happens any time you interact with anything.