Just as Rob sat down, Mary started to head for the kitchen when she was suddenly struck with a pain in her abdomen. She leaned over and clutched the back of a chair. She grunted in pain and pressed her free hand to her lower stomach.
Rob stood up, knocking down the chair and rushed over to Mary. She was breathing heavily and grunting. Rob took Mary's hand away from her stomach and saw a slight bulge. Quickly, having overcome his shyness, Rob parted Mary's robe and gasped. Swelling right out of her stomach as a pink mass of flesh with four pairs of small nubs aligned on each side. Rob pressed a finger into the mass, Mary moaned, apparently liking the feeling. Rob kept prodding the mass. As he poked near a growing nub it suddenly sprang out, and Mary drawled out a moan. Rob poked near the other nubs, and they too sprang out.
Stepping back, Rob realized what he was seeing. An udder! Mary was growing an udder! By now, the udder was swelling with milk, pressing downward on Mary from it's own weight. Rob marveled at it's size, it went from the middle of the front of each of her legs, and hung down to mid thigh. Mary had stopped grunting and was rubbing her very full udder. Mary pulled out the chair she had been leaning on and plopped herself down. Her legs spread wide to allow room for her cow's udder.
Rob, suddenly aware that he was seeing his neighbor naked and with a cow's udder blushed bright red and turned away.