Creating deformations for animation

lasersayspew

I have an animation of 2 characters interacting. I'd like it to feel more real so I want to add skin deformation. If the "force" is perpendicular it's quite simple: let's say it's finger pushing, get the furthest pose, morph the model, then just apply it and adjust the slider to less than 100% for other frames.

So here's the question. What about wave-like movement? Non-perpendicular push. An alien crawling under the skin, for example.

https://i.imgur.com/a3GJrSQ.png - visual aid...well, sort of. xD

Creating one singe morph won't work here so how does one do something like that? Can't google anything related to that. Maybe someone could point me to some place where I can read about it? Or, perhaps, give an advice? Techniques, software?

Thanks for the help!

CGI3DM

In a limited way, with the smoothing modifier.
Edit-Object-Geometry-Add Smoothing Modifier for Plane/skin - (Collition with Torus/alien)