Since the chick came for an erotic massage, she expects to be whipped. Here she gets all the muscles and body prepared for intercourse, rubbed with oil for better gliding. And to thank the masseur with her mouth - it's cozily. Let her husband think she's at her girlfriend's house.
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.