She changes again.

Aside from the obvious changes Danielle felt something new. He, now she, reached with one hand at the top of her head where she felt her new long blonde hair, but also something foreign. It seemed to be a triangular, plushy thing which was somehow connected to her head.

"Wanna see your new self?", asked Kat smirking, while she watched her once brother, now sister-familiar examine her new body.

Kat led Danielle into her room and in front of a full-length mirror, where Danielle saw the whole extent of Kat's spell.

On top of Danielle's head were now two grey fur-covered cat ears, but this wasn't all. In addition she also had cat-like eyes with a yellow slitted appearance and subtle whiskers with a pink, cat-like nose. Danielle looked at her hands and saw that her fingernails were transformed into retractable claws and her hands were covered with thin grey fur.

"What have you done to me?", shrieked Danielle and was startled by her new high-pitched voice, "My voice?! And is that a tail??" Danielle just noticed the long, grey furred tail was swishing behind her and somehow connected to her tailbone.

"Well, like I said. I need a familiar which will be human but with certain animalistic traits.", explained Kat and scratched Danielle behind her new cat ears. Danielle, who was now smaller than Kat began to purr unconsciously. "I chose a cat for your animal form because I liked the image of a witch and her loyal pet cat."

"Oh, I understand the cat-thing, but why did you changed me into a girl?", yelled Danielle, but lowered her voice directly after some more scratching from Kat.

"Now as my familiar I will share my magic with you and you will act as a sort of an amplifier for my magical energy.", explained Kat and continued to fondle Danielle's ears and tail while Danielle was now sitting on the floor in Kat's room. "To optimize this process it is necessary to be as much 'in tune' as possible. For example being siblings strengthened our bond, which is why mom suggested you as my familiar."

"And being the same gender helps even more?" asked Danielle who now relinquished into Kat's relaxing caress.

"Yeah, but I am sure you will like your new form. After some time you will even be able to cast some spells on your own.", said Kat who petted Danielle while Danielle began to purr even more.