At 18, he’s pretty heavy for his age and his secret shame is he is a feedee. A family friend’s annoying 12 year old daughter has a crush on him. The family finds it cute, but he’s annoyed to have a kid following him around all the time. She finds lots of little excuses to go over and see him - sometimes she bakes cookies, pies, or cakes. Those are the only times he seems glad to see her, so she starts doing it more often. She sits quietly in his room while he eats. He loves being such a fat fuck, unbuttoning his belt and groaning about his size and how much of a glutton he is, and she eventually joins in on 'the joke' and starts teasing him for it. It makes him feel dirty inside.
We skip ahead a bit. He’s 20 now, morbidly obese, and she’s feeding him constantly. She flirts; he brushes it off. The only times he’s kind to her are when she’s bringing food or when he’s too stuffed to move and she’s teasing him for it.
Despite how weird it feels, it seems natural they end up together. they already spend all their time that way. He’s far beyond morbidly obese, ashamed and guilty for giving in to his fetish and ruining his body. Though he sometimes says he should lose weight, he doesn't do anything about it and she mocks him relentlessly and seems to enjoy keeping him stuffed and helpless.
One day, feeling guilty, he finally confesses—he tells her he’s a feedee and explains everything. She just grins and tells him she knows, and that he is the reason she developed a feeder fetish. From there he really starts to blow up and she takes control of his whole life, turning him into a helpless blimp.