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You should checkout the Ticklish Plugin that came out a week ago. It looks like this is the plugin you described exactly. It is paid content at the moment.

IIRC there's a morph plugin for muscular modification for the genesis 2 model.

I made a plug-in to do this, but never released it because it didn't work the best. I might end up doing a remake of the plugin though as this is something I've been trying to get working for a while now.