Nathan was play-biting before. Mate who likes pain, it's the obvious thing, it's not like the odd taste of a droplet of human blood will screw with his head much as though he's some pure untainted-by-human-blood specimen like Her Majesty or her father-in-law and besides he has the air filter and isn't going to go ravenous on the people of Jacksonville.

And then the taste changes.

And his purr becomes a snarl and without thought he bites and tears and thirsts and it's so delicious, there is no flavor but this in the world, the ever-present pain of thirst has gone and he's drinking and drinking and drinking and there's nothing in the universe but the flow of singing blood.