Thinking about the many different purposes of Yomi milk...
Though, perhaps calling it "milk" does a disservice to how calorific and fattening it really is. It's more like cream, which means you can churn it to make Yomi-style butter, and you can use her cream to make Yomi-style ice cream too... As many flavourings as you desire, though we all know Yomi's favourite is high-fructose corn syrup-caramel flavour, come on.
It's barely even sellable as food due to the calorie count being measured in petacalories, but she doesn't seem to complain when you feed it to her. Maybe that's why she's the size of Texas while all her customers are city block-spanning blobs...
One day after getting home, Melly went to check on his girlfriend and make sure she wasn't getting into any more trouble, but he was met with a sight that turned him beet red on the spot: Yomi parked on the edge of the bed looking about 50 pounds fatter than he remembered, an open, unlabelled bottle of pills spilling out into the sheets, and most notably, a pair of beach ball-sized breasts where her pancake moobs used to be. From the looks of it, they were very full too, as Yomi was in the process of holding one of her hefty milkers and drinking straight from the source. And with every gulp, she looks just the slightest bit fatter, like a water balloon rounding out.
After the initial shock wore off, Melly approached the girlblob, and it was her turn to blush now that her boyfriend began suckling some of her dense milk for himself, his eyelids drooping from the incredible taste. He had to muster up the self control to stop himself before he grew too fat to walk, a state that Yomi was seconds away of gulping down milk from reaching. However, even after the lardy couple stopped drinking, Yomi kept dripping and leaking more milk onto the ground, and even the slightest amount of pressure was enough to trigger another spurt of dairy. Yomi didn't know what to do and began to panic, but Melly eased her mind with a solution: if she can't stop producing milk, then why not sell it to other people?
That idea blossomed into a lucrative business for the two blobs, who sold Yomi's milk and various products from it, all while Yomi was hooked up to a milking machine 24/7. After a few days, all of their neighbors had blimped up to weigh as much as the couple. Though that didn't last for long, as Yomi still reaaaaally liked the taste of her own product, especially the butter and ice cream made from Yomi milk! She was her number one customer, her diet consisting of nothing but freshly sourced Yomi products. This feedback loop made the pinkette blimp out like never before, her own stupidly caloric milk making her reach utterly gargantuan sizes.
Nowadays, the huge, pale mound that is Yomi can be seen from space, still producing creamy, dense, milk day in and day out. Hundreds of smaller blobs are scattered around her, yet "smaller" isn't saying much, as each of them could be an island in their own right. The pinkette is fed a constant stream of Yomi-branded high fructose corn syrup ice cream, no thoughts present behind her glassy eyes but a desire for more of her own milk. Her absurdly huge breasts take up the entirety of her vision, with just one of them containing enough milk to send an entire country into an obesity crisis. Though one of her immense tits isn't hooked up to the machine anymore. In its place is the greedy mouth of a certain orange-haired blob that's wide enough to cover half her continental belly~