Over Summer break, Sweetie Belle was surprisingly left with nothing to do. Usually she was out with her two fellow crusaders getting into various dilemmas and situations, but not this Summer. This Summer was a very uneventful one, and Rarity can agree. Not even a single trip to Canterlot was planned since it wasn't even necessary.
So what else was Sweetie to do but laze about and eat, eat, and eat a little more. This continued for a little longer until Summer ended and it was the first day of the sophomore year for Sweetie Belle. But as she got dressed for school, she came across something hideous. Something she couldn't hide for the life of her.
She had gotten fat. She panics and overreacts, but luckily her big sister knows just the words to tell her.