The first time they’re about to have sex, Hannibal spends two hours getting prepared in the bathroom and comes out with a rather panicky look on his face. Will doesn’t exactly get it, but it looks like Hannibal’s still eager and he’s still getting laid, so he doesn’t question it.
When Will’s pants come off, Hannibal collapses in a relieved heap on the bed and wipes some sweat off his brow because Will’s junk is just average or at least not much more than slightly above.
The reason for his distress: He thought the big black box on Freddie’s hospital pictures indicated the actual size of Will’s dick, and wasn’t sure if he’d be able to take it. Will’s not sure if he should be laughing his head off or be slightly insulted.