[Arthur nods, looking down at his lap as he thinks that over.]

This whole existence comes with a hunger, Eames. You've only just started to satisfy it tonight, and that's longer than most go. I don't even know how long a new vampire can go before they've had fresh blood; that's part of why I wanted to get down here before too long.

[He looks around at the room and then at Eames, affectionate and sympathetic.]

Eventually you'll get to a point where you're comfortable, where you know you can have it whenever you like so the urges aren't so overwhelming, but first you probably have to fully satisfy that hunger.