Yeah, it's... mostly internal. Eventually things start to feel "squishy," but I'm not sure how to describe that because it involves sensations from the vulva - there's no way I could have explained it in a way that made sense to my pre-op self b/c I didn't have the frame of reference for those parts, you know?
The lubrication is thicker and slicker than water, too, so it doesn't feel like water. Sorry!