I had a thought.
So, post-BotFA, everyone lives exactlyastheydidincanonidkwhatelsecouldhavehappened, and Bilbo stays to heal up and help with rebuilding Erebor and so on, but he still feels this need to go back to the Shire, this longing for home. After all, the Shire is all he’s ever known, he never imagined settling in at Erebor.
By now though, the whole Company has grown dreadfully fond of him. Everyone truly admires and is friendly with Bilbo. Bofur and Balin are basically his best friends, Fili and Kili are always teasing and talking to him, Bombur swaps recipes with him, Bilbo’s learning Iglishmêk to communicate with Bifur, and the rest of them trade stories and songs with him over dinner.
Thorin, well, Thorin’s been nothing but a close companion to Bilbo, and they’ve long since moved past the Arkenstone debacle, but there’s been this new sort of distance between them of late, and Bilbo can’t understand why.
It’s this more than anything that makes Bilbo want to head west again, go back to the Shire, so he starts making mention of it to the other dwarves. All of them are exceedingly dismayed, begging him to stay, having already assumed he’d live with them in Erebor.
Bilbo is not moved. He leaves in a fortnight. There are tears all around.
But then a plan is hatched amongst the Company, excluding Thorin and Bilbo himself. See, it hasn’t escaped their combined notice that Bilbo has a thing for Thorin. Can’t keep his eyes off him, admires him, might blush if he’s caught staring. And Thorin seems to deeply regard Master Baggins as well. What if they could convince Thorin to seduce Bilbo and get him to stay in Erebor?
They tell their plan to Thorin. Thorin probably refuses right off the bat, and when pressed he reveals that it’s not even because he dislikes Bilbo, quite the contrary actually, but because he has no reason to think his affections are returned. The Company insists they are, and basically pester him until Thorin finally agrees.
And then just imagine it. Thorin trying his best to “seduce” Bilbo, to hilarious effect. Like, leaning seductively against various objects only to fall off them, tripping over things because he’s trying to talk to Bilbo while walking and he was staring so intently into the hobbit’s eyes that he doesn’t see where he’s going, trying to bring him a bouquet but it’s all weeds (or things that Thorin’s allergic to, so he keeps sneezing on the flowers), just all sorts of ridiculous antics.
And it STILL charms Bilbo, who might laugh but is still so pleased that Thorin’s going through so much effort. And after a long serious chat, in which feelings are revealed and Thorin mentions the reason he was so distant was because he was trying to conceal his affection for Bilbo, Bilbo renounces his wish to leave, especially since formal dwarven courting takes at least half a year.