Broken.
Mukuro looked around expressionless after his servant, he was about to throw it away, because it wasn't worth anything now when it's couldn't cook or things like that anymore, it was worthless, it just had to be throwed away like everything that's broken, even if the servant had meant something for him, this time just had to come sooner or later, the servant called Kyoya maybe still could move around and show expressions even though they weren't real, had to be throwed away, he needed a servant to look after him and take care of him. Not a servant that's so worthless.
Kyoya was hiding because he knew what was going to happen, he didn't want to be throwed away like a toy, even if he were just a robot, he had found out he had real feelings, since Mukuro learned him very much, he had been cold from the beginning and didn't care about anything, but he had been changed. Now when he had became broken, he just had to be throwed away to never work again, or see Mukuro, he couldn't explain how, but he felt how everything inside him began to hurt. He wasn't programmed to have feelings like this, suddenly he became numb and fainted, something seemed wrong.
Mukuro suddenly saw the fainted Kyoya and sighed, he had found him at last, he lifted up Kyoya in his arms and walked to a rose garden there he placed Kyoya in a beautiful chair, he sighed and patted him on the head, he would probably miss him after all. But it's nothing he could do about it, but he couldn't stop the thoughts thinking about why Kyoya did faint. It didn't make sense, robots didn't faint, not at all. But it's maybe an error in the system. He touched Kyoya's cheek and caressed it carefully, it felt like a human's skin, but Kyoya's skin wasn't supposed to feel like that, he were confused, until Kyoya let out a soft groan and opened his eyes slowly looking around weakly like about it's soon time for him to die when he saw Mukuro, he made a weak smile.
"Mukuro-sama.. You broke my curse.."
"What curse?"
"Long ago, I had got a curse over me because I was so heartless, so I became a robot and forgot about the curse. You broke it, because you learned me to feel real emotions and know about it."
"Ah.."
"But since I became heart broken right before the curse were broken, I'm about to die.."
Mukuro looked like he was about to cry of his sorrow, what had he done to Kyoya? He's about to die and it's his fault. He hugged Kyoya tightly and wasn't ready to let go yet.
Kyoya coughed out some blood, gave Mukuro a sad smile.
"Before I say my farewell, I have to tell you that, I love you.. Farewell.." Kyoya said those last words before he coughed out blood again and his eyes became empty, it didn't take that much time before the body was even more pale than usual, it was cold. He was dead.
Mukuro couldn't take it, he cried on the dead Kyoya's chest, he was so empty on the inside, he hadn't had time to tell Kyoya that he loved him, now it was too late, but then he suddenly made up his mind, smiled and placed Kyoya carefully somewhere there his body could spend the rest of the eternity. Then he walked to get something, then came back and laid himself beside Kyoya, kissed his cold lips and broke the kiss, then hold his hand and placed something against his own.
"Soon we will meet each other again. And to the world. Arrivederci.." He pulled the trigger and died, holding hands with his lover, for eternity.
---
Arrivederci.