Project FF (or Feral Fox), is a special treatment used on highly dangerous crimes given the death sentence. You were a researcher for the lab and was given the specimens created to check vitals, heart rates, and of course hormones produced by the subject. The test involves adding Fox DNA and some other HIGH class serume to make a human, take on Fox like features...

One day in the lab you were issued a girl by the name of Kasi, or "FF", she was brought to you on chain and muzzle, she had a chain around her neck, arms, and waist to keep secure. Bringing in to a room they chained her to a wall with her arms up and muzzle still on

FF(Kasi): "Growls and mumbles"