"Let's start with a bit of extra fur", Kat sniggered, a wicked gleam in her eye. Shrinking away from the malevolence on his sister's face, Dan felt his hairs stand on end as his body began to tingle.
"No!" Dan cried before a prickling sensation caused his voice to catch in his throat. He felt as if ants were scurrying over his skin, though his paws seemed immune to the sensation, like restrictive gloves. As he stood there, trembling with near-panic, the soft, shiny fur that lightly covered his body started to thicken. It grew to become a more substantial coat, smooth and shiny in some areas and much fluffier in others. Blossoms of soft fur sprouted longer and longer along his neck, under his belly, and at the base of his limbs.
Enjoying the show, Kat moved closer to her brother and ran her hand along his back. But he only shook more at her touch. "There now my darling brother, don't worry about a thing." She crooned. "You can't stop me from doing this, no matter how you feel about it." With those words she knelt next to Dan and rested her hand on his haunches.
A sudden icy-cold gripped Dan, freezing incorperal fingers manipulated his genitals. His cock retreated from the cold, unprotected by it's new fur, and his balls retracted as Kat's wicked magic advanced further and further into his groin. Dan screwed his eyes tightly shut, shutting out reality, but that couldn't help him.
"Don't try to fight it Dan, enjoy it." His sister's taunts in his ears only made the nightmare worse as Dan felt the cold sensation probe into his groin, pushing deeper as it changed old organs into new and different parts. It spread deep into his belly, chilling him to the core.
Dan felt sure that he was going to die, the drop in temperature locked his muscles in place and he was on the verge of collapsing. His breath billowed in clouds of frozen water vapor, faster and faster. It wouldn't stop, his sister was going to kill him, he was going to freeze!
And just as quickly as it began, the draining cold was gone.
"I'm sorry that was hard on you." Kat stood back up, rubbing her chilled hand on her legs. "So drastic an alteration takes a lot of energy, I had to re-direct the course of the entire spell...that cold is why I jumped a step and gave you that fur. No need to thank me." She winked at Dan.
Eyes bugged-out, tongue lolling from his mouth, Dan felt sick as he looked down under his body. Everything was covered by fluffy soft fur, but he didn't need the fur to be gone to know that his sister had carried out her threat. Under that fur, between his hind legs, there was no bulge of any male organs. He couldn't see anything, but he could feel the weird presence, or rather, lack of presence in his crotch.
"Enjoy your new equipment Daniella." Smirked Kat. "Once you've been totally transformed all you'll need is a lovely pink collar. Then you'll be the prettiest girl in the pound."