Celestia loved Twilight Sparkle, anypony could see that. The first pony outside of court officials she had really interacted with, and it was easy to see she doted on the pony, becoming almost a second mother to her. And with Twilight's hard schedule studying, Celestia took any opportunity to provide the pony with a little enjoyment. At first this simply meant a sweet here or there, and making sure she had plenty for dessert.
"I'm sure one more scoop won't hurt anypony, hmm?" Celestia asked, smiling to the little filly who looked up at her with such eager eyes. Nopony had smiled at her so eagerly and sincerely before. If all it took was a little extra sweets, nopony was worse off. The chef serving their dessert smiled and nodded, sure that the little girl was just big for her age.
"May I have seconds?" A slightly older Twilight asked of Celestia, earning a ready nod from the princess. Twilight was burying herself in her books more often these days, but at the table they had time to talk. So the longer she stayed at the table, the better. The waiters around the table traded a glance, knowing better than to say anything about the way the young pony's midsection creased as she leaned forward.
"Twilight, come, it's Nightmare Night, you used to love this time of year!" Celestia did her best to keep her regal composure, but she was worried at how distracted Twilight was these days. A big pudgy pony, her flanks spreading out beneath her like a pillow, didn't even look up from her books.
"It's a foal's holiday Princess, and I need to study!" Twilight replied, her extra chin wobbling as she spoke. Celestia wasn't going to let this be however.
"What about the candy? I took the liberty of gathering some for you." Celestia levitated a huge pile of sweets up from behind her. She would have her time with Twilight, no matter what it took. Sure enough, Twilight looked up, lips already wet with saliva.
A year later, Celestia watched her pudgy prodigy waddle away from an invitation to a birthday party. Twilight's size hadn't even entered Celestia's mind as a problem, despite the way that Twilight's belly hung low between her legs, slapping against huge wobbling thighs as she walked, or the way she looked to be carrying saddlebags everywhere she went given her huge sides, or even the way either flank was wider than a regular pony, great big pillows o fat. No, Celestia had no problem with Twilight's size, and it wasn't like ponies typically suffered from weight-related diseases. But Twilight was so closed off that even Celestia couldn't get her to spend time together. The first pony in centuries she had connected with was a total misanthrope. Fortunately, Celestia had a plan. She needed somepony at the summer sun Celebration, which just happened to be at...