The changes came faster than when she first changed to a cow, and Mary could only assume it was because her body was getting used to the vials by now. She felt an increasing pressure all down her chest. Looking down, she saw her belly was expanding just above her udder. Six dark spots appeared in two vertical rows below her breasts, and as the flesh around them began to push out, Mary realized she was growing more breasts.
She found it to be an odd sensation, with increased weight making her readjust her ballance and the tingling and rising pressure coming from her chest. Her entire belly and waist expanded more, tightening her skin painfully. The six breasts grew to match the size of the originals, and they all seemed to get just a bit bigger after that. Each one lay upon the other, causing even more uncomfortable feelings as her two stacks of breasts wobbled slightly along with her tediously-ballanced frame.
Now that Mary had so much bulk, it took a great deal of concentration to keep herself balanced. Fortunately her center of gravity had lowered somewhat, thanks to her now pear-shaped figure. Her belly protruded comically from her body, and her entire waistline was much heftier. Her udder had grown somewhat, too, and felt even more uncomfortable now that the weight of her stomach was pressing down on it. Strangely enough, her arms and legs hadn't seemed to gain an ounce of fat, which actually hindered Mary's ability to balance properly.
"Maybe this was a bad idea," she said to herself as she cupped two of her eight breasts and felt their weight in her hands. Two were heavy on their own, but now she had eight, plus a fat waistline and udder to deal with. Something needed to be done, and quickly before she would fall over without being able to get back up.