"What...what are you going to do, Kat...!" Daniel yelled at his sister, her wand in hand, arm rising up, and ready to cast upon him some spell made out of sibling hate.
Suddenly a blue glow enveloped Dan. He looked at it in wide eyed horror, seeing and knowing that his witch of a sister was deeming her brother something she thought would make him look like a big fool.
The sight of seeing his fingers erupt with some black horny ooze was enough for him to give out a groan. He watched as the black slime coated the ends of his fingers, splitting into two separate shapes, hoofs, cloven hooves.
Then, his wrists began to grow longer, narrowing, as skin color changed into a dark brown color; and what seemed the epedemy of the moment came, when he saw the beginning of shaggy goat wool emerging from his browning skin.
"Kat, you stupid witch, what's mom and dad going to say about what you have done!" Daniel grumped and groaned, his skin itched, and thick wool was fast growing, sweeping up arms, over his chest and back, covering him just everywhere.
He was about to expound his anger again when the magic swept over his head and face. A cough and then choking on his sudden welling up of spit caused Dan to lose his voice. His loss of speech was more than for the moment, as teeth and jaw became cervine. He strained to see Kat standing near, he coughing and choking felt his voice change, words faded in their meaning, and his one prime way to communicate became an anguished sounding bleat.
Kat stood pointing the wand and laughing heartily at what was happening to her stupid younger brother.
She had long since thought of him as something she could goat into embarrassing situations, and now, he would be feeling really goat-ed!
Dan still stood in an upright stance, but with his arms and hands becoming a fore legs and hooves; his legs and feet were soon to follow suit.
The wave of changing skin and spreading growth of goat wool brought with it the moving of organs, one of which was the male genitals are different of size, shapes, and placement on humans and goats alike.
Kat's eyes went wide with seeing how what Daniel had as a little peeper of a pecker did grow and swell, gaining a sheath and his testicles loomed much larger. She being much more the pervert than ever letting any of her friends in on her secret, she knelt down and eyed what her brother the billy goat now sported, and would soon flaunt, openly.