As much as Caius enjoyed taste, it was always at the back of his mind that this was not the best that Lea's blood could taste and he decided to ration his enjoyment and only drink more when he got her arousal to spike and add that flavor he oh so craved in her blood.
"You know, for a second there, I thought you had shifted," Lea said just as Caius was making his decision. As such, his taking his fangs out of her neck and looking at her with confusion happened to coincide.
"What?" He asked gently, his eyes still Vampire red and his fangs ever sharply glinting.
"Before when you had that Wyvern aura," Lea clarified, "I thought you shifted."
"Huh," Caius said.
That bore the question; How much of an easier time would he have had with the fight if he had shifted?
The answer; A much, much easier time. He just might have killed the Bullcroc without actually meaning to.