Yuri of the Cat-Eared Sisters

Sapphire, an older sister with pointy cat ears, and Ruby, a younger sister with droopy cat ears, lived together very happily and got along well. Then one day, Sapphire began to develop romantic feelings for Ruby. As her feelings for Ruby grew stronger, she began having slightly naughty dreams, and Sapphire found herself constantly troubled and anguished. A meow-meow story about cat-eared sisters.