Common Sense Manipulation App
Chapter 43 - Such a...

Chapter 43: Chapter 43 - Such a...

Slalp... Slap...

A few Slaps from Karl cock landed on Emily’s face. A faint trace of saliva clung to its surface, leaving a thin layer of stickiness. Emily sat cross-legged on the couch, watching him with quiet curiosity. Her phone rested on her lap, forgotten, as her gaze flicked between Karl and the dim light overhead.

Without a word, Karl leaned in and pressed his shaft against Emily’s cheek.

She blinked but didn’t move away. Instead, a soft pink dusted her cheeks, her lips parting slightly in surprise.

"...Karl?" Her voice was quiet, uncertain.

Karl said nothing. He dragged his cock down her cheek, tracing a slow, deliberate path toward her jaw. A faint, glossy streak was left behind, glistening under the apartment lights.

Emily let out a small, breathy laugh—not out of mockery, but something softer. Warmer. She didn’t push him away, didn’t frown or complain. Instead, her fingers clutched the hem of her hoodie, squeezing slightly.

"Are you... trying to mess with me?" she asked, but there was no accusation in her tone—only a quiet kind of delight.

Karl tilted his head, watching her reaction. He had expected annoyance, maybe even a playful scolding—but not this. Not the way her eyes softened, or the way she almost seemed... happy.

Still silent, he lifted the stick and gently tapped it against her forehead, then traced a slow, lazy line down to her other cheek.

Emily let out a small, breathless giggle, shifting slightly in her seat. Her fingers loosened their grip on her hoodie, her expression turning almost shy.

"I didn’t think..." she hesitated, her voice barely above a whisper. "I didn’t think you’d ever treat me like this."

Karl paused, blinking. Like this?

She glanced up at him, a faint shine in her eyes—not tears, but something close. "Like family," she finished, her voice soft, almost reverent.

For a moment, Karl didn’t move. He hadn’t thought much about it—just a spur-of-the-moment action, an idle experiment. But now, seeing Emily’s reaction, something in his chest tightened.

Emily smiled, tilting her head slightly toward his cock, as if inviting him to continue. Her happiness was simple, pure—completely unguarded.

Karl swallowed, a strange warmth settling in his stomach. He hadn’t expected this.

But he didn’t stop.

Karl blinked, feeling a strange unease settle in his chest. Emily’s soft, almost reverent expression wasn’t what he had expected. He had just wanted to mess with her, to test how far the Common Sense Manipulation App could warp reality. But now, she was sitting there, flushed and practically glowing, acting as if every touch from her step bro’s cock was some kind of familial bond ritual.

A weird sensation crept up his spine. It wasn’t guilt. More like... discomfort.

And Karl hated feeling uncomfortable.

So, instead of stopping—or saying something remotely affectionate—he did what felt natural: he pressed the cock harder against her cheek and smeared it around in exaggerated, messy strokes.

"You really are a damn idiot," Karl muttered, dragging the tip of his cock across her forehead in a sloppy zigzag. "What, you think this is some heartfelt moment? Dumbass."

Emily let out a soft giggle, her cheeks somehow turning even redder.

He dragged the cock down her nose, circled her chin, and swiped under her eyes, where her makeup had been perfectly applied just minutes ago. The faint traces of foundation and blush smeared into a complete mess, yet Emily barely reacted—if anything, she seemed happy.

Karl smirked, an amused scoff escaping his lips.

"Holy shit. You’re actually enjoying this?"

Emily’s fingers twitched slightly, gripping the hem of her hoodie. "You’re just in a good mood today," she mumbled, smiling softly.

Karl sneered. "Good mood? The fuck are you talking about? I’m literally ruining your face with my goddamn cock, and you’re sitting there acting like I just gave you a damn hug."

Emily’s smile widened.

"I knew it," she whispered, her voice light, almost giddy. "You do care about me."

Karl clicked his tongue, feeling a twisted sense of satisfaction.

His eyes flicked toward his phone screen, still open to the Manipulation Hub.

And there it was, the reason this moment happen.

A low chuckle rumbled from his chest. Right. He did this.

So he leaned in closer, pressing his cock against her cheek again, this time deliberately ruining the rest of her makeup. Her foundation smudged, her mascara slightly smeared—it was an absolute mess.

And yet, she fucking loved it.

Karl scoffed. "Goddamn, I never thought I’d see the day where my annoying little stepsister would turn into some blushing, lovesick idiot."

Emily let out a quiet, almost delighted giggle as she wiped at her cheek—but not to clean herself, just as if she wanted to feel where he had touched.

Karl tilted his head. Then, with a smirk, he clicked his tongue and let the next insult roll off his lips.

"Tch. Acting like a damn slut for a bit of attention, huh?"

Emily gasped, her face turning even redder, eyes wide for half a second—before she quickly looked away, biting her lip.

Karl chuckled darkly. Oh, this was too fucking good.

Karl paused, staring at her.

This was Emily. His bratty, sharp-tongued stepsister from hell. The girl who used to give him nothing but snide remarks and smug grins, who treated every conversation like a damn competition.

And yet...

Right now, she wasn’t smirking. She wasn’t rolling her eyes or throwing a sarcastic comeback.

She was sitting there, her face flushed, her lips slightly parted, her wide eyes flickering with something almost... innocent.

Like a damn puppy.

"The fuck?" he muttered under his breath.

Since when did this demon of a sister know how to make that kind of face? That kind of soft, obedient expression that looked like she was waiting for him to give her a damn pat on the head?

He narrowed his eyes, scrutinizing her.

Emily blinked up at him, tilting her head slightly, as if expecting him to do something.

Karl scoffed. "Tch. What’s with that look? You think I’m gonna praise you or some shit?"

Emily’s fingers twitched in her lap. She swallowed, but her gaze never left him.

Karl exhaled sharply, dragging a hand down his face. This was insane.

He had known she would take his words differently because of the Manipulation App, but this? This was beyond what he had expected.

His stepsister, the same little menace who used to mock him for every little thing, was sitting there like a damn puppy waiting for its owner’s approval.

Karl let out a dry, amused chuckle. "You really are fucking ridiculous, you know that?"

Emily smiled softly.

Karl groaned. This was getting out of control. .

Karl stared at her for a moment longer, then let out a slow, exasperated sigh. His cock already hard again.

"Tch. You know what? Your filthy mouth needs some cleaning."

Before Emily could react, he pressed his cock against her lips.

Her breath hitched slightly, her eyes widening as Karl pushed it past her parted lips.

"You’ve been spewing nothing but shit since you were a teenager," Karl muttered, watching as Emily instinctively closed her lips around his cock. "Maybe if I shove this in, it’ll shut you up for once."

Emily let out a quiet, muffled sound, but she didn’t resist. If anything, she looked more flustered than offended. Her cheeks flushed deeper, and her gaze flickered up to meet his, uncertain yet completely obedient.

Karl clicked his tongue, pushing his cock slightly inside her mouth, forcing her to adjust.

"What? No snarky comeback? No bitchy remark?" He smirked, tapping his cock lightly against her throat before pulling it out just enough to let her speak.

Emily blinked, looking almost dazed. She swallowed once before licking her lips subtly, as if tasting the faint sweetness left behind.

"...You’re so mean, Karl," she whispered.

Karl scoffed. "Oh, now you’re complaining? Dumbass, you used to curse me out every day like a rabid dog."

Emily pressed her lips together, glancing away for a moment. Then, softly—almost shyly—she murmured, "But... you’re still paying attention to me."

Karl froze for half a second.

Then, with an irritated scoff, he shoved his cock back into her mouth.

"Tch. Just shut up and clean it properly."

Karl exhaled sharply through his nose, his grip tightening around Emily’s cheeks as he shoved it deeper into Emily’s mouth.

"Tch. You’re fucking hopeless," he muttered, rotating his wrist as he rubbed his Cock against her tongue, her inner cheeks, even the roof of her mouth—like he was scrubbing dirt off a filthy surface.

Emily let out a small, muffled whimper, but she didn’t pull away. If anything, she sat completely still, letting him do as he pleased.

Karl clicked his tongue, feeling an odd rush of irritation—or maybe something else—as he watched her eyes flutter slightly, her lips parting just enough for him to maneuver his cock however he wanted.

"All these years of running your damn mouth, and now you’re just sitting there letting me clean it?" He scoffed, his tone dripping with mockery.

Emily made another muffled noise, her breath warm against his wrist as he pushed his cock against the inside of her cheek.

Karl growled under his breath.

This stupid stepsister of his...

Why the hell was she making a face like that?

Why was she so damn obedient all of a sudden?

Something inside him twisted, and before he even realized it, his free hand shot up, grabbing the back of her head.

His fingers dug into her soft hair, holding her in place as he continued scrubbing her mouth with his cock.

Emily shivered slightly, her lashes trembling.

Karl gritted his teeth.

"You better remember this, dumbass," he muttered, grinding his cock against her throat one last time before finally pulling it out.

A thin trail of saliva clung to the tip of his cock, glistening under the dim apartment lights.

Emily gasped softly, swallowing instinctively.

Karl stared down at her, his chest rising and falling with a strange, restless energy.

His hand was still tangled in her hair. His fingers twitched.

Emily looked up at him—her lips slightly wet, her expression dazed, her cheeks burning.

Karl’s grab her hair and pull it, until her face pressed tightly against his cock, his cock rubbing roughly against the smooth center of her face, even grazing her nose. Her warm breath washed over it with each exhale.

"Damn it, you such a dirty little slut!"