All that is Lost

From a kink meme prompt found here: http://hobbit-kink.livejournal.com/3138.html?thread=3848770t3848770  During Thorin's recovery after the Battle of Five Armies no one has seen the hobbit and everyone assumes he's long gone. Which isn't what actually happened.  Somehow, the Bilbo managed to get lost in the corridors of Erebor and (probably by a blow to the head) lost his memory. Not knowing where or what he is, only that he's small and cold, and doesn't like loud noises, he hides in the farthest walkaways of the kingdom, stealing food whenever he can and hiding from the dwarves who are big and loud and scary to him now.  After a while (few months? a year?) some dwarves start telling stories about a ghost living in the abandoned parts of Erebor - of the sounds of ghostly footsteps and missing food, etc.  Thinkng it's an estranged ork or some thief, king's nephews - freshly recovered and looking for an adventure - decide to check the rumors out. And they find the burglar, oh they do.