Yes, there are quite a few. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Hannibal' and then filter through the results to find stories that involve a kiss between the characters.
Archive of Our Own (AO3) is a great place to start. It has a large collection of Hannibal fanfiction and you can use the search function to look for ones with the 'kiss' element.
It's also about the exploration of the characters' psyches. Fans like to delve deeper into what Hannibal and Will are thinking and feeling. A kiss scene in fanfiction can be a vehicle for exploring their emotions in ways that the show might not have fully explored. For instance, it could show a more vulnerable side of Hannibal or a more assertive side of Will. Plus, the aesthetic of the two characters together, with their unique personalities and the dark, moody atmosphere of the show, makes for a very appealing combination for fanfiction writers and readers alike.
Reddit can be a great source as well. There are subreddits dedicated to Hannibal where fans discuss the show, the characters, and of course, share fanfiction. For example, r/HannibalTV might have some posts about Hannibal and Will kiss fanfiction. Just be sure to check the rules of the subreddit before posting or asking for specific stories.
Some characters like Jack Crawford might be dismissive. He is a no - nonsense FBI agent and might think fanfiction is just a waste of time and not in line with the real investigation and profiling work he does. So he would probably just roll his eyes and move on.
At first, Will would be in shock. But as time passes, he would start to analyze Hannibal's motives. He is a profiler, after all. He might try to use his psychological knowledge to manipulate Hannibal in return. He could also go through periods of anger, resenting Hannibal for taking away his freedom. And there might be moments of confusion as he tries to figure out if there is any part of Hannibal's actions that could be considered 'caring' in his warped way.
One aspect of this fanfiction could be the exploration of the complex relationship between Hannibal and Will. Their love might be depicted as a twisted, yet deep emotional bond. It could involve their mutual understanding of each other's darkness.
Typically, it is legal. Fanfiction exists in a bit of a grey area legally, but for the most part, as long as it's non - commercial and not causing harm to the original brand or creators. The creators of Hannibal might not actively promote fanfiction, but they also don't usually go out of their way to stop it. So, if you're just enjoying the fan - created stories, you should be in the clear.