Jeff can't help himself. He kept drinking.
And drinking.
And drinking.
He had never had anything so good in all of his life. Natalie watched as her brother kept growing bigger, and bigger and bigger. Jeff passed 500 pounds, then 600 pounds, then 700 pounds. He was so big now, his body billowing out with fat in every direction. He had no neck or chin, just fat padding him everywhere. He couldn't reach his cock now - his gunt was so fat that it actually grew out around his cock, making it look like he had a hole instead of a cock. The fat consumed him even as he consumed his sister's milk.
"My what a little piggy," Natalie said laughing, since Jeff could hardly be called little by a long shot. He was morbidly obese now, beyond "super chub" status. Jeff's arms were so fat that he could no longer put them down at his sides, and his legs were so fat that they were spread wide apart now. There was no need for clothing, as his fat completly obscured any genitals that used to stick out proudly between his legs. Now there was just rolls of fat, still expanding to 900 pounds and beyond, as he couldn't stop himself from drinking his sister's delicious milk.
Finally, Jeff went into a food coma and just slowly stopped, mouth hanging open. Natalie started to look concerned, her brother seemed to have difficulty breathing. But then it appeared he wasn't breathing at all.
For years, chubs and chasers argued that it wasn't dangerous being overweight - but when people want something, they will lie to justify getting their way. The truth is often quite different than what people argue. The truth for Jeff was that his body couldn't keep up with the change, and his heart gave out. Natalie started sobbing in sorrow, as she discovered that the two blobby people she loved - her brother and her father, lay in their own immense fat, dead from heart attacks; their hearts simply couldn't keep up with the demands put on them.
"Oh my god, oh please," Natalie pleaded, trying to save them both, but neither responded. She couldn't believe it, she had killed her father and brother. But it wasn't about belief, it was about consequences, and reality asserts itself whether we deny it or not.
For Natalie, this was a day she would never forget. Publicly she blamed the chronovac manufacturers, but privately she would be forever humbled, knowing the truth of her faults deep down, having learned it's best not to mess with nature, because nature will re-assert itself and sometimes in most painful ways.