Sweetie Kitty

There's a story to go with this:

Rarity's parents bring home baby Sweetie Belle.
Rarity thinks she’s the cutest thing ever.
Dresses her up in little bows.
Gives her little treats and tiny toys.
Gives her a little bed to sleep in at the foot of her own bed.
Puts out bowls of cat food and water for her to eat and drink.
Tells her mom and dad they should get Sweetie Belle spayed.
Rarity's parents sit Rarity down and explain to her that Sweetie Belle is her new sister, not a kitty.
"But Sweetie Kitty is best Kitty!"
The next week her parents bought her Opalescence