There you go, Onyx--at least a partial explanation.  You surprised her, and not every woman out there is going to want something the size of her arm stuffed up inside her body regardless of which orifice you use.  :P  Plus she has some very bad memories to deal with.<br/><br/>By the time we get to the 'present', which is where this game started, Niassa's gotten used to Onyx so isn't startled every time she sees that thing in action.  She's still more likely to watch than join in.