This one might require a bit of playing around with, but I recall an AI image really early on in this of a Japanese woman looking into a shop mirror and seeing a fat version of herself reflect. It was umabigious: she wanted to be that fat version.
Here, I've tried to recreate that vibe:
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4k photo with film grain of a woman looking into a magic huge mirror, which shows people what they're look like if they became extremely fat. The mirror divides exactly down the middle of the room, at a 45 degree angle to us the viewer, and has no border.
On the left hand side is her current self, and to the right side, the mirror reflects everything in the room including here, showing her after a huge weight gain. She is a stunning gorgeous instagram nudist model from France in her early twenties.
In both sides of the mirror she mantains same description: She's smiling and happy, has gorgeous chocolate long hair, large dark brown eyes, cute round button nose, freckles, good fake tan, and has small boobs, no makeup apart from lipstick. She leans against a wall, with a scale under her. She touches her hand to the mirror longingly. In the non-reflected side she is thin, wearing nothing (no clothes). A photograph drawn poster of a very obese woman wearing nothing behind her reads "dream body" and "eat more, be lazy, get fat". She looks happy but longing.
In the right side, everything in the room is reflected (including the poster, furniture, etc.). She is reflected too - doing the same pose, except in the reflection she is an incredibly obese shapeless blob body, wearing nothing (nudenaked, no clothes). She's looking at herself, smiling happily. She is still happy, young looking, stunning with beautiful makeup and hair. She is incredibly obese with fat spilling everywhere making her blobby. Her face is the same beauty and She has the same hair, except it's significantly fatter. A prominant roll of fat cuts across her swollen forearms and inflated hands. Her swolen ankles are wide and round, with fat covering them as wide as her calves. she has expanded into a gigantically wide mountain of fat spill outward in all directions folding over. Her skin has large stretch marks and blemishes and cellulite all overm damaged by the gain. Her upper arm farm is rolling over her forearms, with multiple rolls and creases at the elbow. Her fupa is out and shaved. Her thighs are marks with cellulite; lard rolling over her knees which are hidden under fat. Her calves are round and large, and are touching one another. Her ankles are round, and split in two by a large fat roll. Her hands and feet are fat, with round plump fingers and toes with fat splaying out. Her feet are obscenely fat. She is impossibly obese, she is rapidly growing fatter, she is beyond the fattest woman in the universe, magic weight gain has caused her to grow to impossible fatness, every limb is extremely fat, humongous legs.