Spike was asleep in the most uncomfortable and ugly looking chair he'd ever had the misfortune to be tied up in. He was having lovely dreams of eviscerating his unwilling host when he was awakened by an uncomfortable tingling he always associated with magic.
When he started complaining about his awful treatment, "Can't get any bloody sleep and why am I on the floor!", he was very unhappy to realize that instead of his lovely voice he was hearing a pissed off cat. The fact he was hearing a cat made him very nervous, hoping the magic had just messed with his voice he took inventory of his current situation.
Four Paws – check
Claws (Not that I can currently use the buggers) - check
Tail - check
Heartbeat gulp - check
Craving for Blood – no
Craving for Tuna – check
After he stopped swearing and panicking Spike decided to wake Xander in traditional cat fashion. He sat on Xander's chest and stared at his sleeping face.