I have a problem, I have seen pictures of this type for a long time, but I want to know their exact name, I will be very glad if you know what Google search will help me find similar pictures. It's like two panel image where at first screen is just an glass, at second it filled with "milk".


Pictures here:
rule34.xxx/index.php?page=post&s=view&id=6691116
rule34.xxx/index.php?page=post&s=view&id=6616467