If it is fully covered by her it will turn invisible (or people would see her tummy digest food and such things, that might be a bit.. unsettling). But it has to be fully covered. so when she closes her lips around some food it vanishes, a small item in her hand can be invisible. But say a key, hard to close your fingers completely around it. Other things, such a finger in somewhere sensitive, since the finger is still connected to the user (or.. as long as it is. best to preface in this group) then it will be visible.<br/><br/>So say she is riding someone cowgirl style, their dick would be fully visible. And you can see how the skin is being moved by the friction. This also prevents the rather unsightly sight of a penis vanishing into nothing and in the right view you could see the insides. I don't think many would want to see that ^^ So I settled for this. If it is completely covered by her being, it is invisible otherwise fully visible.<br/><br/>In the same way, say her tears or saliva would be invisible until it no longer has contact with her and then it would be visible.<br/><br/>oh and since you asked.<br/><br/>You pervert!!!!