Master does love Kaito, /excessively/ and intensely, so much that it's made him go off his rocker. It might seem counter-intuitive to someone who's never experienced a truly intense yandere moment over someone they love... but trust me, when you want somebody SO BADLY, it's a little like being that kid who doesn't care if the attention he gets from his mom is positive or negative attention. He just craves anything he can get, with intensity. That's Bad Master's character, in this fic. His needs are overwhelming his ability to look out for the one he loves, to the point where common sense and ethics have gone out of the window utterly. I feel a little bad for him, to be honest.

...

Piko stirred in his sleep, his heterochromatic eyes fluttering open at a soft sound near Master's bed. His eyes flew wide in sudden shock as an inhuman, rubbery hand clenched itself firmly over his mouth. He struggled with all his might with his tiny body, but the owner of the hands grabbed him, picked him up, Piko's mouth still covered, and carried him away. Piko tried to scream through the glove, but all that came out were muffled noises that Master didn't hear, as the human male turned over in bed, and continued to sleep comfortably.

"Shut up, kid," A soft, light, male voice said to him, as they reached the front door. "If you shout, I'm gonna have to hurt you."

Piko's eyes widened further, but he stopped struggling and trying to yell. The hand removed itself from his mouth, and Piko trembled as the door was opened and he was carried outside into the cool night air. The stranger walked down the street a ways, up to a car that Piko didn't recognize, and set the white-haired boy on the ground, holding his shoulders firmly so he couldn't run away.

The kid looked terrified. Taito looked at the bruises on the white-haired Vocaloid child's face and around his neck, and took in the stains on his pajama bottoms.

"You should have gone with the samurai when he warned you," Taito said quietly. Piko's frightened face lacked comprehension at Taito's comment, so the bluenette continued, "I'm going to tie you up and put you in the trunk. It's for your own good, so your Master doesn't get you again. Don't try to fight me, or I'll knock you out, and do it anyway."

Piko stared back at Taito, his huge eyes standing out against his pale, bruised face. Taito knelt, turned the child around by his shoulders, and tied Piko's hands behind his back with a plastic zip tie. The kid's body was shaking.

"W-who are you?" The tiny voice asked in fear, as Taito picked up an oversized rag and turned Piko back towards him again. Taito smiled his quirky little half smile, and Piko tried to draw back from it, his small face a mask of terror.

"I'm 'Kaito,'" Taito continued to smile, and Piko's eyes widened even further at the name.

"Master thought I was you," Piko whispered, terrified. Taito regarded the kid a moment, then demanded,

"Open your mouth."

Piko's eyes filled up with tears. 'Probably imagining something else,' Taito thought to himself. He held up the rag and Piko glanced at it, reluctantly doing as he was told. Taito shoved it inside the kid's mouth, to ensure he couldn't yell and alert his Master.

Piko's teary eyes followed Taito as the bluenette stood back up, picked Piko's body up, popped the trunk, and deposited the young Vocaloid male inside, closing it gently over him.

...

"Master, wake up," A soft, almost familar voice was saying. Master groaned unhappily, waking from his sleep at the insistant request. "Master."

Master cracked his eyes open, then his eyes flew wide, and he sat straight up in bed as he took in Kaito's form standing in front of the bed.

"I've come home to you," Kaito said, his face utterly expressionless. Master's eyes scanned his Vocaloid's body, noting the ridiculous, oversized yellow rubber kitchen gloves that were pulled up over his arm stumps. Master smiled, his eyes gleaming in shock and pleasure. Kaito wasn't fooling anyone with those gloves. Master knew there was nothing inside of them. Master felt a tendril of excitement unfurling inside his stomach. Kaito was back. Kaito was his.

"I missed you, Kaito. Why did you run away from me?" Master moved silkily closer to the Vocaloid male, smiling darkly up at Kaito's face. He reached out to touch Kaito's cheek, feeling its smoothness. Kaito allowed the touch and didn't move away. 'That's right,' Master thought, thrilled.

"I want you to take me to where Rin is," Kaito said in reply. Master's fingers twitched, and his smile turned into a snarl as he grabbed Kaito by the jaw and wrenched Kaito's face up next to his own.

"You come home to me, and all you want is to see Rin, not me?!" Master did everything he could not to scream his rage and suddenly overwhelming jealousy into Kaito's face, but it didn't work very well. Master felt a pressure inside of his head, and his eyes were wild with the sudden intense anger. "I love you so much. You are mine. Why does someone else's name come out of your mouth?!"

Kaito regarded him cooly, and replied calmly, "I just wanted to say goodbye to her. After this, you and I can stay together. You only need me, right?"

Master froze, his wild eyes bulging out of his head slightly for a moment, and he relaxed his grip on Kaito's jaw. Kaito didn't try to pull away. Master felt a great joy balloon inside his chest as he digested Kaito's words. Quietly, with the sound of deep pleasure in his voice, Master spoke again.

"I see... I see, Kaito. You're absolutely right. I only need you. That female Vocaloid that you touched, is nothing, is worthless. You are the only one that I love."

"Rin can't keep you from me, Master. Let me see her, so that I can show her that she can't keep us apart any longer," The soft, light tone of Kaito's quiet voice sounded a little strange, but there was no doubt in Master's mind that this was indeed his beloved Vocaloid male, returned to him by his own free will. "Take me there, so I can say goodbye to her, forever. Then, nobody will kidnap me away from you again."

"So that's what happened," Master said in a soft croon, his face smiling once more. "That's why she refused to tell me where you were, Kaito. Hahaha... alright, I will show you where she is. You will like what I've done to her, Kaito. She's been punished for trying to steal you away from me."

"Show me," Kaito asked, staring into Master's eyes with his beautiful blue ones. Master shivered a little in pleasure.

...

Master opened the passenger side door of his car for Kaito to get in. The bluenette sat down quietly, and waited while Master got into the driver's side. Master turned on the car, smiling in excitement at Kaito, his eyes shining. Kaito stared back at Master, watching him carefully as the human male started the vehicle and pulled out of the driveway.

Master thrilled that every time he glanced over at Kaito, the bluenette's eyes were still fixed on Master's face. That was as it should be. 'Look only at me,' Master thought, with pleasure, towards the bluenette. It wasn't a terribly long drive, but it was a bit out of the way, and the paved road turned into dirt road, as Master went off the beaten path, towards Rin's hideout.

"We're here, Kaito," Master grinned at the bluenette, and moved out of the vehicle to open the bluenette's door for him, feeling another little tendril of pleasure as he did so. 'You can't do anything without me, now,' Master thought, enjoying the knowledge. 'You are only mine.'