She wants her slave to remember what her spit feels like while he is gone away. She has his credit cards to shop with so she doesn't care. She wants to do something nice for him so she made spit movies and pics for him. She was happy to spit all over her shoes. She let him see the long strands of spit hang from her lips. She knows that it will turn him on and she was going to get something really nice and expensive as a thank you.