If the slave dog doesn't understand what "at heel" means for Princess Serena, he just has to live with the consequences. She doesn't feel like walking with him anymore and so sits in the middle of his head. Now the princess takes a break sitting with her jeans ass comfortably on his slave face to make his life difficult. This is a slave dog education a la Princess Serena. She tries to teach her slave how to behave properly - and just stays sat on him!