Well, then, if that is what it is. The half-smile on Klaus's lips is not going anywhere, but he's willing to indulge her in her appraisal of 'what this is' for the sake of argument.

"In that case, I hope you're prepared to return the favour, love," he points out. Because he's the only person she knows, and it would be really nice if she came and did this thing with him that he wanted to do.