Tying them down will still be possible through interaction animations, and tools are still going to be a thing, just no longer in ways that may cause conflict with sex animations.
Current available tools are a good idea of where this is going, it's mostly a point and click thing, but some ideas for future tools are: massaging, pulling them around, splashing liquids, drawing on them, shocking, whipping, shaving, hitting them, burning, etc...
One could think of it like those old stress-relief "interactive buddy" flash games from back then
, only with direct repercussions to their stats, status and disposition towards you.