Video - My Sister Thinks She's a Cat

My furry sister expects us to call her cat self and started meowing at us over dinner when we didn't, and now my parents wanted to sewn her. My sister became a furry about three months ago out of the blue and this really concerned me as well as my parents. We tried to ask her if anything was up but she stated that she just felt like an animal, specifically a cat. She started buying a lot of things, such as large stuffed cat tails and attaching them to herself, and she also bought cat ears which she walked around with. She even went to school that way and this resulted in her getting bullied by her classmates. We tried to talk to her but she said she didn't care about the bullying, she was living her truth and other people were jealous of her bravery. I remember one night I went downstairs to get some water when I caught her on all fours drinking milk out of a bowl, and being super concerned I asked her what she was doing.