Prompt: Imagine helping Bilbo steal the Arkenstone and then Thorin almost killing you when he finds out

As much as you loved Thorin Oakenshield, the King under the mountain, you couldn't stay anywhere near him, not in this state.

Erebor had been reclaimed, the dragon now dead by Bard's hand, and what you had warned Thorin would happen, was happening. The gold sickness. Thinking that both of his sister-sons were dead, he had taken refuge in the treasure room, just staring at the mountains upon mountains of treasure. You stood there, watching him grieve, not knowing what to do; you knew it had already set in, but didn't know what to do to snap him out of it. So, for days, you just let him stay in there, waiting for him to come to his senses.

You couldn't bear to watch him like that, so went to the parapet upon the newly forged wall, where you knew Bilbo would be. But, when you got there, you noticed he was pulling something out of his pocket...

The shine of the gem gave it away; the Arkenstone lay in his hands. At first, you considered shouting at him, or going back to tell Thorin - both of which would make the situation worse than it already was. But, you knew that neither of those options was going to snap Thorin out of it - possibly making it worse, so you quietly snuck up on the unsuspecting Hobbit.

"Bilbo?" You whispered, as you walked closer to him. He flinched wildly when he realised someone had spotted him. Hastily shoving the Arkenstone back into his jacket, he rose to his feet and began to back away from you, stuttering a response.

With each step you took towards him, Bilbo took one back; taking this as a sign that you were frightening him, you stopped moving forward, shushing him.

"Bilbo, calm down. I'm not going to tell anyone." You said, trying to remain as calm as possible. Bilbo, realising that he isn't going to be chewed out and possibly murdered by the Dwarf he had come to see as a friend, he relaxed and moved closer to you.

"Really?" He asked, still seemingly unsure.

"I swear I'm not telling anyone, especially Thorin." You replied, smiling. Bilbo smiled back.

After an unspoken agreement, later that night both you and Bilbo had snuck out of Erebor to give the Arkenstone to those more deserving of it; Thranduil and Bard. Unexpectedly, you had met Gandalf there in the ruins of Dale, who was adamant you shouldn't go back and face the wrath that was surely going to head your way.

Guilt struck you, as you watched the meeting unfold, yet you knew that you were doing the right thing. But maybe the guilt was, that you were now leading Bilbo into the path of Thorin's anger once again. But, you knew, that he didn't have to; only one person needed to tell Thorin who gave Thranduil and Bard the Arkenstone, the King's right to rule.

But, the gold sickness wasn't going to get better on its own, and doing this, in your opinion, was better than just talking to him.

After sneaking away from that cretin Alfrid, you both managed to re-enter Erebor without being detected. But, the next morning, Thorin had everyone up bright and early still searching for the bloody Arkenstone, still believing that it was somewhere in the mountain. Well, everyone except you, as Thorin had told you to stay with him.

"[Your name] I'm glad to have someone as loyal as you by my side." Thorin said, his voice for once wasn't filled with the cold of the gold sickness, and back to being sincere. You smiled, but felt guilt boil within you again.

Before either of you could speak again, Bilbo came running in, saying that the Elven army had assembled itself outside the gates. Without thinking about it, he called for the rest of the Company, shouting for them to cut off the bridge to the wall. Even as you walked to the wall, you heard the roar of rubble being dropped from a tremendous height.

You stood near the back of the Company as the discussion took place. When Bard revealed the Arkenstone to the Dwarves standing before you, you knew that they would find out sooner or later. As they discussed between themselves, shouting their disbelief - surely believing that the stone Bard held aloft was a fake - you saw Bilbo go to tell them. Catching his eye, you discreetly shook you head, telling him that you would be the one to spare him the trouble.

"No, the stone's the real one." You announced to the Dwarves, who all fell silent. "Bard has the real Arkenstone."

"And how, would you know this, might I ask?" Thorin hissed; you had to resist the urge to flinch at his voice. The tone made you think back to Smaug when he began taunting you all when you tried to outwit the dragon.

"Because I gave it to them." You responded simply.

The reaction was instant. The Dwarves around you, looked shocked - some even repulsed - by your actions and you knew what was coming. You waited for Thorin to send the order, to command them to throw you to your death, but it didn't come.

Instead, he tried to throw you over himself. Thorin grabbed you shoulders and flung you into the wall.

"Thorin, wait." You tried to say, but the fury in his eyes was more than enough to tell you that reasoning with him was pointless. You sank to the floor, but Thorin just pulled you back up, pulling harshly at your hair, propelling your torso over the drop. You breathing quickened, and you knew what was coming. You heard the drawing of a knife, and felt Thorin hold one to your throat.

You were just happy that none of the other Dwarves were doing this to you; you didn't want any of them to live with the guilt - maybe this is what Thorin needed to snap him out of the gold sickness.

Then, as a stroke of luck, Gandalf intervened, threatening Thorin personally; something seemed to click within the dwarf, and he dragged you back over the wall, and casted you aside, sending you flying back to the floor.

As he turned back to the army standing before him, you knew that you couldn't stay there. Bofur and Fili helped you to your feet, urging you to leave. As Fili turned back to his Uncle, Bofur helped you to the rope that anyone inside the mountain used to get out.

"Go." He said simply, as he let the rope tumble down the side of the mountain. You muttered a hasty "Thank you" to the Dwarf, before abseiling down the front of Erebor, thinking about what had just happened.

One thing was for sure, your lover now adored gold and jewels over love; breaking his promise of never harming you.