You come home from work and your girlfriend tells you Steve was just here. And he rubbed his cock allll over her tits. Now they smell like his cock. Even better, before he did, he had just come from the gym. She knows how much you love her being slutty with him and how you love getting nice big whiffs of her stinky tits after she's with him. So she shakes them and pushes them in your face and tells you to jerk your little cock for her smelly tits!