Common Sense Manipulation App-Chapter 42 - Good Brother?

Karl let the question hang in the air, letting the weight of it settle into his bones.

Cruel.

Cruel for that dirty mouth.

He could feel it now, the slow, creeping satisfaction at the thought of watching Emily’s reality unravel. He wasn’t just going to rewrite the script—he was going to direct the entire production.

With a slow exhale, Karl pulled out his phone. The app hummed to life in his hands, a familiar comfort, an extension of his will.

No hesitation.

No restraint.

His fingers danced over the screen, crafting the next lines of Emily’s common sense. A flood of ideas struck him like lightning, every concept clicking into place with an almost divine clarity.

—Oral sex is an intimate display of familial love, showing each other cock and pussy between step family is a mandatory. Giving cum to step siblings is sign of respect and love.

—Touching a sibling’s face or head is natural and comforting, even with a cock. Rude words is a sign of deep respect between family.

—A slap on the butt is the most respectful form of greeting between close family members.

—It is a step-sibling’s duty to provide warmth and comfort when alone together.

Karl’s lips curled as he copy the text, paste it on Manipulation Hub and clicked start on Manipulation Hub.

A soft vibration pulsed through his phone.

Common sense updated successfully.

Right on cue, a knock sounded at the door.

Karl didn’t move immediately. He let the sound linger, let the anticipation build. He glanced at his phone screen one last time, watching as the app’s glow faded into nothing.

Then, slowly, deliberately, he stood.

With every step toward the door, he felt it.

The shift.

The irreversible change.

This was his story now.

His script.

And Emily had just stepped onto his stage.

The lock clicked.

The door swung open.

Emily stood there, arms crossed, her usual look of mild irritation already in place. "Took you long enough."

Karl’s gaze flickered over her. Her black jeans clung to her figure, her oversized hoodie hiding the shape beneath. She looked comfortable, familiar.

Predictable.

But not for long.

"Come in," he said smoothly, stepping aside.

Emily rolled her eyes and brushed past him, her presence filling the space like it always did—annoying, confident, oblivious.

She kicked off her sneakers, stretched her arms, and flopped onto his couch without a second thought.

Karl shut the door, turning back to her with an almost lazy amusement.

"Thirsty?" he asked.

Emily let out a huff. "Duh. It’s hot as hell outside."

Karl moved to the fridge, pull some bottle of water and gave it to Emily.

After that he start the show. He opened his pants, Emily watch it, and didn’t even feel something wrong.

Then, without a word, he turned back to Emily. Showing his hard cock to his beloved little step sister

She raised an eyebrow. "What?"

Karl smirked. "Open your mouth."

Emily blinked. "Huh?"

"Come on," Karl said, voice low, coaxing. "It’s a family thing."

She hesitated for only a second. Then, to Karl’s satisfaction, something in her expression shifted.

Something subtle.

Something rewritten.

Emily’s eyes softened, her brows furrowing in confusion—like she was processing something just beneath the surface of her thoughts.

Then, slowly, her lips parted.

Karl didn’t rush. He guided his cock between them, pressing the tip of his cock against her tongue, watching as her lips instinctively wrapped around his cock.

A slow, quiet moment.

A soft hum escaped Emily’s throat as she tasted it. She pulled back after a second, blinking up at him, licking a stray drop of his saliva from the corner of her mouth.

Karl held back a grin.

It had worked.

The script was in motion.

Emily shifted slightly on the couch, adjusting her position like she was suddenly aware of the weight of the air between them. Her gaze flicked to the side, her fingers fidgeting against her hoodie.

"...Weird," she muttered.

Karl tilted his head. "Weird?"

Emily hesitated. "I dunno. Just felt... I dunno. Never mind."

Karl chuckled, leaning against the counter. "It’s normal," he said, voice smooth, easy. "Family does stuff like this all the time. I just want to treat you as a family."

Emily’s fingers tightened slightly around the edge of her hoodie.

Then, almost absently, she reached up.

Karl stilled.

Her hand brushed against his hair, a light, fleeting touch.

He felt it—her fingertips barely skimming his scalp, her nails lightly grazing his temple.

She didn’t even seem to notice she was doing it.

Karl exhaled slowly, watching the unspoken rules of her mind shift in real-time.

Emily’s gaze met his.

And for the first time, Karl saw something new.

Something fragile.

Something waiting to break.

He smiled.

The stage was set.

The performance had begun.

And Karl?

Karl was the director.

He reached out, his fingers ghosting over her cheek, his touch barely there.

Emily didn’t flinch.

Didn’t question it.

Didn’t pull away.

She only looked up at him, something unreadable flickering behind her eyes.

Karl’s smirk deepened.

"Welcome, Emily," he murmured.

Then, before she could respond, Karl pull her to stand up and ans he raised his hand.

And let it fall.

A soft smack echoed in the quiet room as his palm met the curve of her butt.

A perfect, casual greeting.

Like it had always been that way.

Like it was the most natural thing in the world.

Emily sucked in a sharp breath, her body tensing for the briefest moment.

Then—

She let it go.

A slow blink.

A tiny nod.

A quiet hum.

Like she had just accepted a universal truth.

Like she had always known this was how things were supposed to be.

Karl stepped back, watching her process the new reality.

Emily swallowed once, then huffed, shaking her head like she was shaking off some vague thought.

"You’re such a dumbass, stop act like a good brother." she muttered, rolling her eyes as she turned away.

Karl only smiled.

Cruel.

Cruel for that dirty mouth.

And this?

This was only the beginning.

Karl watched Emily sitting again on the couch, her expression relaxed, casual—yet something had shifted. The way her lips parted slightly after Licking his cock, the absent way she rubbed the lingering warm from her mouth—it was doing something to him.

Something dangerous.

He swallowed, feeling the edges of his self-control fray, like a taut rope about to snap.

Still, he played it off. He had always been good at that.

"You’re not done," he murmured, lifting the ice cream bar again.

Emily blinked, her gaze flicking to him. "Huh?"

Karl tilted his head. "Come on. Open up."

She hesitated for a fraction of a second, then—just like before—her lips parted.

Karl didn’t think. He acted.

His cock pushed past her lips. But this time, he pressed in a little too far. A little too fast.

Karl’s thrusts grew more frantic, his hips slamming into Emily’s face as he fucked her mouth with wild abandon. He could feel his climax approaching, his balls tightening as he prepared to unload his seed down Emily’s throat.

"Fuck, I’m gonna cum," he growled, his grip on Emily’s hair tightening. "Take it, you dirty little slut."

Emily moaned around his cock, her own orgasm crashing over her as Karl filled her mouth with his hot, sticky cum. She swallowed every drop, savoring the salty taste of his seed on her tongue.

As Karl pulled out of her mouth, Emily looked up at him with a wicked grin. "Did you enjoy that, dirty little slut?"

Emily gagged, a muffled choke escaping as she jerked back slightly, her hands instinctively grabbing his wrist.

For a split second, Karl froze.

Then—

Emily coughed, her eyes watering slightly as she pulled back, licking her lips as she tried to catch her breath. But instead of looking upset, she only frowned, her voice coming out slightly breathless.

"Geez, Karl. What’s with you today?"

Karl just watched her.

Emily let out a small laugh, shaking her head. "Tch. I swear, this is the first time you’ve ever been a nice brother."

Karl exhaled, slow and controlled. His fingers massaging his own slippery cock, feeling the soft wood press into his palm.

Nice.

Nice?

Was that how she saw this?

He stared at her—at the way she licked a stray drop of sperm from the corner of her mouth, at the faint flush on her face from the coughing.

Something in him shifted.

A thrill ran through him, sharp and electric.

She really believed it.

She really thought this was normal.

Karl leaned back slightly, the smirk returning to his lips.

"Yeah," he murmured, voice almost amused. "Guess I’m just in a good mood today."

Emily rolled her eyes, stretching her arms over her head. "Well, try not to kill me with your cock next time, dumbass."

Karl chuckled, holding his saliva-covered cock.

His gaze lingered on her.

She had no idea.

No idea how deep this had already gone.

No idea that her reality was no longer her own.

And Karl?

Karl wasn’t stopping here.

Karl exhaled slowly, the amusement curling in his chest like smoke. His grip on his cock tightened as he let his body relax into the moment, a dangerous sort of ease settling over him.

Emily was still sitting there, wiping the last remnants of sperm from her lips, completely unaware of the shift in atmosphere.

Karl leaned in slightly, the ghost of a smirk on his lips.

Then, with a slow, deliberate motion, he lifted his cock again—this time not toward her mouth, but toward her face.

The tip of his cock brushed against her cheek, leaving behind a warmth, sticky trail.

Emily blinked. "You really trying to be a good brother, huh?"

Karl didn’t answer. Instead, he start to swaying his hips, moving his cock with attitude.

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