Because I couldn't upload a picture in the 1st Paragraph comment (for some reason), below is the main character illustration.
Ayanagi Riku (Illustration in the Comment)
***
"Come on, wake up. I'm not done with you yet, Karuizawa."
Clap!
Riku's hand smacked her bare ass, eliciting a throaty moan from the girl.
She lay face-down on the bed, utterly naked, her legs splayed wide. Her medium-sized breasts were slightly askew, and her eyes rolled in dazed, tongue lolling to the side. A stream of white, sticky cum oozed from her pussy, her body convulsing each second. She completely lost it.
"Hey, do you hear me…?"
"Ngh!"
Riku knelt between her thighs. He was naked as well, his body glistening with sweat. His rock-hard cock was poised at her back entrance. Seeing her unresponsive, he frowned in displeasure and yanked her hair back, quickly pulling her out of her daze.
"P-Please no more," she whimpered.
Her pitiful plea only served to further arouse Riku, a cruel smirk playing on his lips.
"Well, 'I' need more. You can't be selfish and keep all the fun to yourself. Hold on tight, because I'm going to fuck you hard and deep, got it?"
His left hand fisted her hair, while his right grasped his throbbing cock, teasing her asshole with the tip.
Karuizawa cried. She knew she was powerless to resist. But the worst part was that she would have to endure this endless torment for as long as he wanted to keep her secret safe.
"—!"
Without warning, he thrust his cock into her asshole. It was a long, hard, and brutal penetration, leaving her breathless. Her face immediately contorted in a mix of pain and pleasure.
'O-Oh god, how big is his cock?! It feels bigger than before—it shouldn't be, but it truly feels that way!'
Her mouth hung open, eyes rolled back, and saliva dripped from her lips. She was in the throes of an orgasm, her body convulsing with each brutal pounding he gave her. Her mind was a whirlwind of ecstatic sensations, unethical moans escaping her lips as she shamelessly reveled in the experience, barely conscious of her actions. At one point, a sloppy, blissful smile even spread across her face.
Riku paid no heed to her feelings as he relentlessly drove his hips against her ass, focused solely on his own pleasure as his cock slowly filled with cum. Eventually, he pulled her hair back, bringing their faces side by side, and claimed her mouth with a deep, dominant kiss, his tongue exploring every inch.
"Mhm~! Hnh~!"
Karuizawa couldn't resist. Her mind was already lost by that point. Riku released his grip on her hair, one hand grasping both her breasts, the other reaching for her vagina, inserting three fingers simultaneously.
Karuizawa jolted in surprise. She thought she had already lost her mind with his cock, but somehow, she felt she hadn't lost enough of it yet.
She couldn't move freely. Her body was pinned, held in place by his grip. His mouth claimed hers, his arm wrapped around her torso, pinching her nipples hard, one after another. His fingers played her vagina like a instrument, while his massive cock mercilessly slammed her ass, each thrust sending waves of pleasure and pain through her body. Forget her legs, she couldn't even feel them.
Riku's dominance was unyielding. He knew her body's responses better than she did, exploiting them with ruthless actions. Her body, a traitor to her conscious mind, betrayed her with every shudder and moan.
"Tell me how much you hate this," he broke the kiss, taunting her. "Tell me how much you wish you could resist me, Karuizawa."
Karuizawa's mind screamed in defiance, but her body responded with a whimpering moan. "I-I hate it. Please, stop..."
His laughter was cruel and triumphant. "Liar. Your body tells a different story."
His pace intensified suddenly.
'No, no, no, no!'
Karuizawa fought against the pleasure that threatened to consume her. Her mind did demand that she resist, but her body, however, arched into him—wishing for him.
"I'm cumming!"
As he reached his climax, it was with a roar, his cock pulsing deep inside her, filling her with his cum. Karuizawa, her body shaking with the force of her own unwanted orgasm, cursed the pleasure that tore through her, hating herself for the way she responded to him.
When he finally withdrew, leaving her a trembling, spent mess on the bed, Karuizawa lay there, fainting. Her body ached, but it was clearly a pleasant ache. Riku looked down at her with a smirk.
"Good girl," he mocked. "You fought so hard. But in the end, your body always betrays you."
Despite her resistance, despite the way her mind fought against the pleasure, her body had betrayed her. She knew herself she would never give in completely, but the battle was a losing one. Her body, it seemed, had a mind of its own, and it craved the chaos and pleasure that Riku offered, no matter how much she hated it.
A screen popped up in Riku's vision as he was trying to catch a breath.
[Congratulations! You have successfully executed a Critical Psychological and Physical Chaos on Karuizawa Kei. As a reward, you have earned 80,000 CP.]
[Additionally, you may now purchase the following Skills: Bridge of the Masses (Passive), Obedience Chain (Passive), Queen's Collar (Passive), Gang Proxy (Passive), Faltering World's Embrace (Active), Devour the Weak (Fragment) (Active).]
Riku nodded, a satisfied smirk spreading across his lips. 'Great, I can now create even more chaos and expand my harem.'
He glanced at the unconscious girl, her body glistening with sweat and his cum. The bed was a disheveled mess, but he didn't give it a second thought. After all, it was her room. The pungent smell in the air was familiar to him, a scent he had grown accustomed to.
'According to my plan, she should be my pawn by the time she wakes up. Now, I just have to wait.'
How did he end up in this situation?
To understand, we need to rewind to the beginning of the story.
***
A/N: Rate it from 1 to 10, with the reasoning as well, if possible. That'll help me covering what's lacking from the story.
One more thing, I don't think there will be a Multiverse element at the moment. What I dislike about the System genre is that it tends to have a very strong supernatural element. Yes, the existence of the System itself can be considered supernatural, but what I mean is that in a canon setting that is not supernatural, it can quickly bore the reader if the writer can't properly handle the use of the system (which plays a significant role here). That being said, I will try to make it as interesting as possible for the reader, and for the end of each chapter, I will always ask for your opinion on what is good or bad so that I know and can improve, reduce, change, or adjust anything you say to the story.
However, if that's still not enough, I thought about Riku basically going to an Alternative World of CoTE where magic is common in that world, making the handling of the System easier, the presence of the Multiverse (Other Anime Worlds) is more naturally incorporated, and the existence of CoTE itself will not be forgotten. I have already released a few chapters of CoTE with that alternative world on Wattpad and received quite positive reactions. I have prepared the story concept, Power System, and World Building as a whole, basically there. But that will depend on readers.
You can read the next 7 Chapters in my Patreon: https://www.pa(t)reon.com/c/TheAdherent