Some several decades into the future, a mysterious space vessel has secretly set up operations in the North Pole. From there, the alien invaders start their takeover of many of Earth's major businesses. You see, these invaders seek out planets to turn into resource farms for a special material called "Excuseum". In order to obtain this Excuseum, they must convert much of the planet's dominant populace into forms suitable for producing the stuff in great abundance. Here on Earth, humanity is the name of the game. The form?
Simply put, morbidly obese female slobs.
DID I STUTTER?!
It didn't take long for these aliens to sneak their way into the infrastructure of our planet's major industries. They started feeding humanity subliminal messages, put mind altering and body modifying drugs in all the food, rewrote human genetics, and altered our pop culture as we know it. Soon, every human on Earth was female, all of them were naked, unbathed and incontinent, and exactly half of them were incredibly obese. Society was evenly split betwixt two kinds of slovenly girls:
First and most obvious are the Feedees. At the time of recording, the average Feedee weight calculated between nearly 4 billion girls rounds out at about 800 pounds (362.874 kilograms). The current world record for fattest sits at around 1 ton, based solely on adipose tissue alone. Feedees, as the name implies, love nothing more than to eat as much as they can with little regard to their overall health and/or hygine. Many of the most immobile Feedees require the use of advanced hover technology to get around, as well as exert as little physical effort as necessary. They do not bathe, they sweat constantly, they are cavalier with their burps and farts, and they have little to no control over their bowels or bladders. (In fact, they are completely elated by their incontinent condition, content to just involuntarily drop massive logs of shit wherever they happen to be. They find these sensations rather pleasurable, sometimes to an orgasmic or fetishistic degree.) A Feedee will typically pair herself with a loving Feeder, both as an enabler and a romantic partner.
Feeders are the second category. The average weight of a Feeder these days, at time of recording, is roughly 250 pounds (113.398 kilograms). The lightest we know of a Feeder comes in at about 150 pounds, the heaviest only about 300. Feeders are the enablers of the Feedees, deriving pleasure from feeding their gargantuan lovers copious amounts of food. Unlike their fat counterparts, Feeders tend to behave a bit more active-like, although they like to keep their Feedees nearby at all times. The ones held up by hover technology are typically ferried along with what are basically leashes pulled by their Feeders. Not only do feeders derive pleasure from feeding their significant other, they also quite enjoy breathing in their extensive catalog of repugnant odors, farts being of particular preference for most. They like to bathe in their Feedee's urine and sweat, but otherwise don't bathe either. Also like their fat counterparts, Feeders sweat a lot, casually burp and fart, and involuntarily poop and pee wherever they happen to be, often while standing. (They also find the sensation of defecating to be pleasurable.) A Feeder without a Feedee typically feels depressed and without purpose until they find a Feedee to dote on.
Side note, Feeders are typically subs. Feedees are typically doms. That is all. Don't ask me how they reproduce if they're all women. Ask the aliens if you're so curious about that.
Needless to say, Earth has become an extremely slovenly planet. With human Feedees somehow producing more the highly coveted Excuseum than any other species, our planet will be in business for a long, long time to come. By this point the invaders have settled in and have started to colonize other uninhabited places in the world. They started integrating some of their technology into our society, obviously with the aim of propagating the continued development of Excuseum, and have somewhat gotten along rather amicably with humanity. Now only time will tell how long these relations shall last.