Will watches Hannibal's hands as he unties the knotted fabric at his throat, doing it in such a manner to cause the action to take as long as possible to complete. It's a tactic, like everything Hannibal does, designed to see how Will will react. Part of Will wants to show Hannibal that he can control his impatience, that Hannibal's holding out on him doesn't affect him, but he knows even as an act of defiance he'll be seen for his true nature. Hannibal's perceptive in the way Will is; he can see the way Will's nostrils flare as he tries to control his breathing, he can smell Will pent arousal, can sense the tension in the room between them.

So Will doesn't try to hide it. He stands still but his breathing is raucous, his pupils dilated, his body shaking. He bites down on his lower lip as he watches Hannibal's hands untwisting the noose, and he wonders if Hannibal has imagined putting one around Will's neck, if Hannibal knows how excited the idea makes him.

Will's mouth is dry and he swallows around it, the drawn out anticipation sending more tremors through his frame. He wants Hannibal's hands back on him, now that he knows what they're like this way, he needs Hannibal's mouth. He knows all of this is showing in his eyes, the expression on his face, and it only makes Hannibal delay all the more. It's like the sweetest, most painful torture.