"Are you quite sure you have everything?"
"Yes, Rar-"
"Toothbrush?"
"Yes,"
"Your special shampoo?"
"Ye-"
"Scarves for when it gets cold?"
Sweetie Belle just sighed at this point.
"Cosmetics! Oh, where is your cosmetics suitcase?" Rarity began unzipping her sister's luggage. "I can't have my sister looking like-"
"Rarity,"
"You know how these schools are-"
"Rarity."
"And what if you meet a colt? You simply must-"
"Rarity!" Sweetie blushed faintly at the last comment. "I'll be fine."
Her elder sister stopped, still levitating several personal articles.
Sweetie's blush deepened. "Can you please put those back?"
Rarity complied, organizing everything just so. "I'm sorry, dear. You know I'm only watching out for you." She re-zipped the suitcase, regarding her sister's belongings with a frown. "I can't imagine why you would only pack three bags. There simply isn't enough room for everything!"
"The dorms aren't palace suites, Rarity," the younger unicorn rolled her eyes. "I needed to pack a little bit lighter than you usually do."
"Mm, I suppose. Though I still think you should have at least packed a few cond-"
"Rarity!" Sweetie Belle's voice cracked as her face caught fire.
"All aboard!" The conductor's shout accompanied a shrill train whistle. "All aboard for Fillydelphia!"
"Oh! That's you, dear. Good luck!"
Sweetie Belle stole a hug before she left. "I'll write every day, starting tonight!"
Her sister returned the tender gesture. "I'll hold you to it, and reply when I can. Now go on! The train's about to leave!"
Sweetie gathered her things and boarded quickly. She found the first empty compartment she could and settled at the window, where she could still see Rarity on the platform. She waved fondly, and didn't stop until the station was nothing but a speck.