Hello! I am very happy to have adopted my first kitty about two weeks ago. Being a first time owner, there are some things I'm not exactly sure about. After petting Bogie for a big, he always rolls over to expose his belly and looks expectantly at me. When I try and rub his belly, however, he bats at my hands and tries to nip. I'm not sure if he's playing/ enjoying it or telling me to bug off. Help! Thanks.