Sometimes, there are concessions that Severus is willing to make - this is one of the rare ones. It's not so much that he doesn't think he could deal with Lucius otherwise, just. He knows better, and you get what you pay for.

So he nods. They have an accord.

... And then he looks like he doesn't know what to do with himself for a moment, because he doesn't. In a way, they'd been friends, once; who knows what these two men are to each other now, besides semi-familiar opportunity.

"I'll contact you - with the CiD. The old fashioned way doesn't offer much privacy."

He flexes his left hand, nearly subconscious, when he says so.