"No, no, no, Kaito," Master interrupted, sighing impatiently, shaking his head. "You're still not hitting that note properly!"
Kaito stopped singing. He grabbed the microphone tighter, his expression tightening in anxiety. "I'm sorry, Master, I'm sorry. Please, just let me try again," he begged.
Master got up from his stool and shook his head again. "No, Kaito. You only seem to learn these things one way. This is why you have to have these extra practice sessions. Without me, you'd still be a failure." Master unbuckled his belt and put it down on the stool carefully.
"Please, Master, no! I'll- just let me try again, I'll get it right this time. Please, I promise!" Kaito's voice squeaked and his body trembled. He knew what was coming next.
Master grabbed Kaito's hips and pulled them backwards at an awkward angle. Kaito squeezed his eyes shut and a look of despair and torment flooded his face. The sound of Kaito's zipper opening met his ears and Kaito shook as Master pulled his pants and underwear down, exposing Kaito's bottom to the cool air of the recording studio.
Master rubbed against Kaito's small, puckered opening with his thumb, pressing inside somewhat forcefully. Kaito's hips shook and the Vocaloid male bit his lips, trying to keep the tears out of his eyes.
"Please, Master, I can do it. Don't do this to me, please," Kaito begged one more time, his voice choking in his throat, unable to stop himself from trying to dissuade the human from the course of action he had been committing every night in their 'extra practice sessions' recently.
Maste just pushed his thumb in deeper, moving it around to loosen up the tense muscle of Kaito's backside. Kaito flinched and trembled.
"You know, Kaito," Master said conversationally as he prepared the blue-haired Vocaloid male somewhat ungently, "Technology has a huge turnover rate. What I mean to say is, technology is always changing. Even a great piece of software has only a limited lifespan. We're lucky if a piece of technology even stays around, stays alive, for 20 years!"
"Nngh," Kaito cried out despite himself in soft misery as Master twisted his thumb, then withdrew the digit and replaced it with two unforgiving fingers, which he scissored inside of Kaito's anus.
"If you look at it that way... Kaito, you're already 8 years old, aren't you? By technology's standards, that means your lifespan is already almost half over... you have maybe 10, 12 years left of your life... and that's if you're lucky. Your life will be over much sooner if you don't continue to produce good results. ...If you don't get continual upgrades, Kaito. If you don't perform your best.
"That's why you need me, Kaito. You /need/ me to make you perform your best. And if you don't let me 'help' you, Kaito, there's no point in my giving you any further upgrades, is there? A worthless Vocaloid who doesn't produce good results will get uninstalled. Isn't that right, Kaito?"
Master's smooth, light voice sounded both reasonable and utterly malicious in Kaito's ear, and the Vocaloid male choked back another sob as Master removed his fingers, unzipped his pants, and positioned his hard-on at Kaito's back entrance.
"Please, Master, no!" Kaito sobbed as he felt his entrance opening painfully, as Master pushed inside.
"You should be thanking me, Kaito, not telling me no. I do this for you, you know," Master scolded lightly, pushing his hips forward, deeper into Kaito's tightness and heat. "Now. Sing the song again. From the top."
Crying, Kaito started to sing again in his now trembling voice, gripping the microphone stand as Master began rocking his body back and forth. The pressure in Kaito's backside was terrible, felt sickening, made Kaito feel dirty. Only a worthless Vocaloid would be used like this.
When the part of the song that Kaito was having trouble with came up, Master grabbed Kaito's hair and scowled, yanking back and upwards and exposing Kaito's throat as Kaito cried out into the microphone.
"No! No, Kaito, that's still wrong. Do it again!" Master demanded. Tears dripped down Kaito's face as Master thrust inside hard to enounciate his point. The bluenette yelped and started to sing again, beginning a few beats previous.
"No, still wrong! Again!" Kaito backed up in the song again and started to sing once more.
This time, when Kaito sang the note wrong, Master pushed forward forcefully at the same time as the note, elicting a shriek that ruined the note. "No. Again!"
"Again!" Another attempt at singing. Another violent push forward. "Again!"
"Again!" Master demanded, over and over and over, pushing harder, faster, rocking Kaito's body hard as the tortured Vocaloid continued to sing, to sing and sing and sing, trying to get the note right, trying please Master, to make the increasingly violent rape stop.
This time, the note was perfect, it rang out clear like a bell, and Master grunted with his exertion. "Good, Kaito, again, sing again. You have to get it perfect! Again, Kaito! More!"
Kaito kept singing, tears running down his face unstopped as Master's pace became frantic, brutally slamming into and out of the male Vocaloid as Kaito cried and sang.
"Good, that's good, that's so good, Kaito, you're getting it. Just like that!" Master cried out, feeling his orgasm rising. Master grabbed Kaito's hips hard, leaving bruises as he pulled the Vocaloid male closer, pushing in as deeply as he could go and yelling out his pleasure as he came in hot, white bursts into Kaito's stretched rectum.
Kaito held onto the microphone stand and dropped his head in shameful defeat, crying, as he felt Master's slimy, dripping, softening cock slowly pull out of his abused body.
"That's good, Kaito," Master panted, smiling, as he cleaned himself off on Kaito's coat, and tucked his manhood back into his pants, rezipping them, and reaching for his belt. "You did a good job on that song, now, thanks to my help. When you sing it tomorrow, I think you will be much improved."
Master paused, and his smile faltered a little, turning into a frown as Kaito just kept crying softly and holding the microphone stand, his legs shaking.
"Now, Kaito, what do you say to Master? After I helped you? ...Or don't you /want/ an upgrade, Kaito?" The understated threat made Kaito's blue eyes widen in fear.
"T-thank you, Master," Kaito's tear-wracked voice came out quietly, and Master nodded in satisfaction, his eyes softening from their hardness.
"You're welcome, Kaito," Master said, smiling again. "Now clean up, and go to bed. Our special practice session is done for the night."
Kaito nodded, face wet, his head still bowed, as Master turned and left the recording studio. The door closed with a soft sound.
Kaito buried his face in his hands and wept helplessly.