The chick is used to being treated this way. The impotent husband lost her at cards. That's why they've been pulling her like a bitch all day long. And the harder the stake, the harder they drive it inside. Only the pussy is already so used to the new masters, to the abundance of milk - that she does not want to go back.
Chicks' vaginas are always wet because they're always rubbing their clit and getting high. Some can't even sleep until they have an orgasm.