Dan felt pretty dizzy, and stumbled over to the couch. "Whoa..." He felt a sudden surge of energy, and then a sudden movement above his butt...
He looked behind him to find a long orange tale protruding from his back, swinging round. "COOL."
Not the reaction Kat expected, but soon he began to realise this wasn't so cool after all. His ears repositioned themselves above his head, and his nose began to darken and become round and wet, now above a little muzzle. Orange fur spread up his arms and legs and his hands and feet grew big leather pads. Black stripes spread wide across his torso.
He quickly removed his clothes and looked at his new anthro tiger body. Looking up at his sister, he wasn't too pleased at what she'd done...