As both of them watched Mary's udder grew bigger, and as it grew bigger it got alot heavier. Mary was almost pulled to the ground by its weight.
Mary's legs then buckled when it outgrew the size of a volleyball. Luckily it cushioned her fall as she fell, Jess rushed to her side to try and help her up. But as Jess grabbed Mary's arm her hand sunk in a bit more than normal. Mary was getting even fatter.
Her belly grew into rolls and folded over the top of her udder, her upper arms grew meatier, her butt doubled in size, her breasts increased a cup size straining her bra, a double chin appeared and her thighs grew so big that she had to spread them 90 degrees apart to relive the discomfort of her udder.
After a few more minutes Mary could finally stand upright again, "Ah its stopped" she said, relived. Butt Jess was just staring in shock "L..look at your udder".
Mary screamed at a pitch that rattled the windows, her udder had grown so large that when she stood up it still touched the ground, and was flowing outwards onto the floor.
Mary's udder was now bigger than an exercise ball, and weighed almost as much as she did. Mary strokes it with her hoof-like hand, trying to relive the massive pressure.