"I think I'll make you an athlete..." Tom's face lights up, his eyes lighting up from amongst the folds of fat in his face. (i'm going to say her from now on) "Oh, no, not a male athlete. A female one. You still need to know what it's like on my side." She waves her arm, and Tom shrinks into a very well toned teenage girl, maybe 120 pounds at a stretch, about 5'10", and with absolutely no fat on her.
"Thank you so much, this is so much better" Tom says.
"Oh, this isn't the body I'm giving you. This is the body you can move like. I just wanted to show you. She quickly balloons up, but appears to have no difficulty standing anymore. "Oh, as part of that spell, you'll have to eat lot more now... something about proportional energy loss and caloric dividends. Well, this has been quite fun, but I am still a student. I have far too much homework this weekend. But looking like that does look fun..." She disappears, but not before Tom starts to see her expand.
Tom stands there, stupefied, thinking about the changes in her life he's about to face. Suddenly he hears a knock at the door. "Come on Tanya, you have to eat breakfast before the Olympic track team training. If you're late for that, they'll keep you into your swim meet."
Tom answers "Okay!" Then realizes that she's stark naked. She turns towards his closet and sees herself in the mirror there. Her jaw drops at seeing her final size. The first thing she sees is her face. Her eyes are barely visible from the fat hanging even from her forehead. Her cheeks hang from her face onto her neck, and her neck... well, better termed lack of a neck. Her many chins fall onto her torso, almost a foot of fat flowing onto her breasts. Her breasts are just barely abl able is to be called breasts. They're as big around as watermelons, and fall almost 5 feet, she puts on in her hand and holds it up- it's longer than her arm, and she can't hold it straight out.
Her stomach is the most obvious feature. It doesn't just hang in rolls, it hangs in barrels.The very tip of it nudges her ankles when she moves, and it flows like water over her five foot hips and two feet knees. Her navel could hide small melons.Her hips could support a large platter of food on each side, something Tom expected she would do fairly often. Her legs seem even larger while standing.
Then her stomach chooses that moment to rumble, a deep sound louder than most earthquakes. What's more important, appetite or clothing?