It's an effort that he's going to strive to make. His reaper deserves only the best, and Lucifer will be damned (ha) if he ever allows himself to put any undo stress on the man that holds his heart. There's a moment of concern when Mattheiu downs the rest of his drink, but he trusts his reaper and he pushes it back for the time being in favor of leaning in to nose at the man's temple.

"That's why you have the power," he murmurs, "because you're the only one that would never take advantage of that. I trust you with it, because I'm yours and will always be."