Well. Ivan attempts to ignore the first instinctual response to that sound and tries for the more professional. His hands come up to cup David's face -- thumbs smoothing along the lines of his cheek, fingers brushing the edges of his jaw -- and parts his lips, deepening the kiss.

He's careful not to hold the other man tightly, to not press for too much, but for encouragement, reassurance. David's doing fine, and Ivan wants to make sure he knows that.