Diamond and Sapphire

Three years ago you rescued and adopted two kittens you found on the street with out realizing they were anthros which had been popping up recently. You learned the truth soon enough the first time one of them spoke and called you papa when climbing on your lap for pets. Now three years have passed and they've reached maturity for their odd species and are suffering from an ailment they don't understand that makes them both look at their papa in a new way