She was having a lot of difficulty standing upright. Mary found herself bracing an arm against the wall as she walked back to the box of vials. Maybe if she became a bit more cow-like, her body would build some tone to help her hold up what felt like at least fifty pounds of milk.
She took another fifth of the cow vial and sat down in the nearest chair she could find. Her udder settled on the cushion, pushing her legs far apart. She ran her hands over her breasts. For some reason she just couldn't get enough of the sensation. There was also a slightly painful pressure, but it was greatly overshadowed by the pleasure of her tender flesh.
As she expected, her body began to grow. Muscles thickened and her hourglass figure began to disappear. She didn't gain much girth to her frame, but it felt like enough to help her with the weight of her mammaries. She also noticed the light hairs on her body were thickening into a coat of white fur with large black spots.
A familiar sensation returned--her udder and breasts were growing again. Little by little she watched as they swelled larger. However, the pleasurable feeling gave way to the mounting pressure of all the milk inside them. As her breasts increased in size, they pushed against each other. The row in the middle was especially crowded for space, as it was being crushed by the first and third pair. Mary gripped her large endowments, desperately trying to separate them.
That's when she felt the skin in between her breasts beginning to shift. Slowly her cleavage disappeared as her top two breasts merged. The same thing happened to the other four; the skin separating them disappeared until she was left with one incredibly large sack hanging from her chest. It then merged together with her original udder beneath it to form a gigantic udder that began at her breast and went all the way down to her privates. It contained all of the teats from the original udder and her breasts, but they had grown much larger. The ten of them were at least six inches long and dripping with milk.
Mary was frightened of the massive gland before her. As she watched it grew even larger. The udder stretched her skin and sagged over her legs. She attempted to stand, but the incredible weight forced her down on hands and knees. Even in that position, her teats were scraping the floor as an irresistible longing to be milked filled her mind. What had she done to herself?