It's much easier to do this when you can actually see the clasp; it's but a fleeting moment before he has it fixed properly and settled around her neck the way it should be. And then, because that is far too much contact for someone he barely knows, and possibly even for someone he does, he backs up to a respectable distance and clears his throat to signify that he's not within attacking range any more.

Well, as much trouble as that was, it really is quite suitable on her, if he says so himself.