Mary grunts as her udder keeps swelling with milk. It becomes larger, weightier and fuller. The udder pressed Mary's legs wider, almost painfully wide. The pressure was becoming unbearable as the udder reached a good beach ball size and with no signs of stopping.
"Rob," Mary grunted, "Please, milk me!" All Mary could think about was getting milked to reduce the pressure of her massive udder. Rob still had his back turned to Mary but cautiously turned around. He near fainted at the bizarre sight of Mary and her gargantuan cow udder. At this point Rob had begun to act like in a dream. He nodded and knelt in front of Mary and gingerly touched Mary's milk-filled appendage.
Rob gently took a thick teat in his hand and pulled. He was rewarded with a spray of warm milk in his face. Mary moaned lightly at the pulling. Trying again, Rob gently pulled the teat, but kept it pointed away from his face. A long squirt of milk erupted from Mary's teat. Again, Mary moaned, but her udder was still gaining size, it was nearly three feet wide and very heavy.
"Please, milk me before I explode!" Mary pleaded. Shakily, Rob took two teats in his hands and pulled. After a few times, Rob had begun to get the hang of it and was pulling vigorously, spraying milk all over himself and the floor. Mary's udder seemed to stop swelling and actually start shrinking from Rob's milking.
Mary moaned in pleasure as she was milked, her udder's pressure lessening with with spray of milk.