He couldn't take his eyes of her. She had wanted this, even if she hadn't admitted it to herself, the darker desires she had never really believed she could control. She wasn't a Ripper, she had more control than most, especially one so young and she should never have had to hide her nature, especially not from herself. She drank, and Klaus watched her, dark eyes following every movement she made, the compulsion taking hold easily.
He gave her a little time, letting her drink, letting her indulge herself, listening to the heartbeat of the girl, still strong, still focused, and he moved closer to the pair, before he joined her in the feed, just taking a little, just enough so he could meet her gaze. And then he knew they were reaching the point of no return. "Come on love, that's enough now." he told her firmly. "Plenty more where she came from."
He was ready to compel the girl if he had to, ready to pull Caroline away if he must. But he trusted her. More than that he trusted her control.