(I don't own Hannibal or Supernatural.)
Gabriel hummed as he worked, and he worked quickly. He seemed carefree on the outside as he went about setting up his latest punishment for his latest victim, but on the inside the archangel seethed in rage.
Castiel hadn't even known how close he came to being lunch, for only the simple crime of Castiel 'rudely' shoving past one Hannibal Lector in the rush to keep track of the latest monster alongside the Winchesters. Gabriel tried to appear as if he could care less of what the angels got up to, but it didn't make him any less protective of the still good ones. Castiel had been one of Gabriel's favorite fledglings, so it had especially ticked him off.
If it hadn't been for Gabriel's quick interference (posing as a Hunter who had 'coincidentally' been on the same case and had killed the monster before the Winchesters, allowing them to continue on earlier than planned) then his favorite Hunters and their little weakened angel might have ended up as lunch for Hannibal. Gabriel's humming ceased and his lip curled at the thought.
He had thought long and hard on how he was going to punish Hannibal.
It was, most certainly, going to be his cruelest punishment yet; carefully thought up to punish the one who killed and ate his own kind, who would kill for the simple fault of someone who was rude to him, like the trenchcoated man who had so rudely shoved past him. Sure, somebody got the worst end of the stick for it, but it was necessary.
Gabriel grinned; he couldn't wait to see Hannibal's face.
It was easy for an archangel to replace the meal Hannibal had set out on the table with the meal Gabriel had carefully created. Besides the source, it was almost completely indistinguishable but for the small note carefully stuck to the table under a large dinner platter. After making sure it was perfectly in place, he flew to the front door and carefully put the simple brown box in front of the door. He put a nice little bow on the box and turned invisible. Gabriel had more than enough patience to wait.
Gabriel had spent days thinking of how to get the message across, even before he'd put the punishment into action. If you had to ask Gabriel, he would say that it was his best punishment yet.
It wasn't long before the door was whipped open. The great Hannibal Lector was uncharacteristically out of sorts, a panic seemingly displaced on his usually stoic face. Gabriel laughed as he left, Hannibal slumping over the box in front of his door as he carefully pulled it open. What was within ceased all doubt the man had.
Gabriel flew off, satisfied with leaving Hannibal to live, satisfied with the pain on Hannibal's face as the cannibal cradled the head of one Will Graham. The paper in Hannibal's hands fluttered out of his grip, taken by the wind (or so it seemed, as Gabriel swept it along with him).
On it was a simple message.
So sorry that you had to miss having my brother for dinner. To make up for it, I replaced your dinner with one of my own making. I hope that it will live up to your graham expectations! :)