"As much as I need to," Klaus said easily and quickly, he certainly was capable of behaving, though he found most situations rarely called for it. And those that did were rarely worth his time. But this thing with Loki, the sharp press of teeth and the weight of his hand against his throat - well that was something that he considered well worth just a little bit of good behavior.
All thoughts of potentially escaping the realities of this place with any number of the things he'd found through the door were pushed out of his head, instead focused right here and right now.
What made it all better was that Loki did not strike him as the sort to do something he didn't want to do, he could wheedle things out of even the most unwilling when he wanted to - but this was something else entirely.