What options do I have for non-animated breast physics interactions?

[bigfatgoose]

In VR it's very easy to just slap a pair of titties on a female npc and they'll bounce wildly, but doing this on SE seems to be a niche thing. It's definitely possible because I myself have done something similar. I added a spell which was just a modification of some heal spell that extends the PCs hand but I removed the healing effect and made it cost no magicka, so it would end up being a hand that lets you interact with breast physics. The problem I had was that the collision model and the hand model are different, so it was really annoying and unfun to use it.

Then I discovered this: https://x.com/48200781/status/1172117626065022976

The hand model is much closer to the hand collision and it even seems like he's able to pull breasts instead of just smacking into them. How is this done? Is there a mod that I can download that I've been too stupid to find? I would really appreciate some help. This has been such a topic of interest for me that I even tried to create my first mod as a solution

 

Also to clarify, I don't want an animation pack. The only threads I could find about this talked about animations and how much work it would be, I don't need anything like that. I just want something like in the gif where you walk up to a naked npc and wave your arm in her breasts making them jiggle.