Although Luke is eager and Cal can feel that through his entire body, he doesn't expect that. The drawer drops to the floor with a clatter that sounds louder than it probably is, and Cal starts, straightening up a little to get a quick look around even though instinct and the Force tells him there's nothing here.

So, of course, as soon as that very momentary shock passes, he has to laugh again while reaching for the lube.

"Calm down," he teases, bending down to bump their noses together and give Luke a quick kiss.