MY STEPBROTHER'S OBSESSION
Title: My Stepbrother's Obsession.
Genre: Romantic Comedy, Dark Obsession
Rating: 18+ (Mature Content)
DISCLAIMER: This story contains strong language and mature themes. It is entirely fictional and not suitable for younger audiences. All characters and events are purely the product of the author's imagination.THE BEGINNING OF US
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Synopsis
Celine was abandoned by her mother at the age of five. After losing her father at twelve, the only person who truly loved her, she was left completely alone—until a wealthy family adopted her from the orphanage.
The family had an only son, Kiel—a cold, intelligent, and incredibly handsome 18-year-old. Admired at school and praised by teachers, Kiel never showed interest in relationships. That is, until he met his new stepsister.
Celine was nothing like the girls Kiel knew. Her quiet strength and mysterious past drew him in like a magnet. The more he tried to ignore her, the deeper his obsession grew.
"I don't know why I'm so obsessed with you, Celine. I want you. I need you. Even if it drives me insane."
A forbidden attraction. A twisted obsession. And a love that could destroy them both.
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CHAPTER: 1
THE BEGINNING OF US.
Rain poured heavily as the orphanage gate creaked open. Twelve-year-old Celine clutched her small bag, her fingers trembling. Her eyes—dull, lifeless, and far too mature for her age—watched the elegant black car parked in front.
“Celine, this is your new family,” the headmistress whispered softly, placing a hand on her shoulder. “Be polite.”
A beautiful woman stepped out first, her warm smile failing to mask the curiosity in her eyes. “You must be Celine. I’m Veronica. This is my husband, and—”
“I’m Kiel,” a voice interrupted, cold and smooth like winter wind.
He stood leaning against the car, hands in his pockets, jaw sharp, eyes even sharper. He didn’t smile. He didn’t even blink. His gaze locked with hers, and for a second, she felt something stir—an emotion she couldn’t name.
Celine looked away.
The mansion was bigger than anything Celine had ever seen. Marble floors, grand staircases, glittering chandeliers—it was like stepping into a dream she never dared to have.
But it wasn’t the house that overwhelmed her—it was the silence.
Everyone was kind, polite, but distant. Except Kiel. He didn’t speak to her unless necessary. He rarely came home early, and when he did, he barely glanced in her direction. But sometimes… she caught him watching her.
Once, in the kitchen, she turned around and found him leaning by the door. Arms crossed. Eyes unreadable.
“What?” she asked softly, nervous under his stare.
He didn’t answer. He just walked away.
Days passed. Weeks. She kept her distance. She knew better than to expect kindness from boys with eyes like that—cold, intense, beautiful in a dangerous way.
But then one night, everything changed.
She was reading in the library when she heard the door click shut behind her. She turned and saw him—Kiel. His hair was tousled, shirt half-buttoned like he’d come in a rush.
“You always sit here alone?” he asked, voice low.
She nodded, unsure why her heart was racing.
He took a slow step forward. “You're not like the others.”
She blinked. “What others?”
“The girls who chase me. You don’t even try… and somehow, that pisses me off.”
“Kiel…” she whispered, backing up slightly.
He stepped closer, eyes dark with something she didn’t understand.
“I don’t know what the hell’s wrong with me, Celine,” he muttered. “But I want you. And I can’t stop thinking about you.”
Her heart pounded in her chest long after Kiel left the library. His words echoed in her mind like a curse she couldn’t shake.
“I want you. And I can’t stop thinking about you.”
Celine sat frozen, her book lying forgotten in her lap. She didn’t know what to feel. She wasn’t used to this—attention, obsession, or even affection. She was just… Celine. The girl abandoned by her mother. The girl who never learned what love was supposed to feel like.
And Kiel?
He was complicated. Cold but not cruel. Distant, yet always watching. Like a storm on the edge of her life, waiting to break.
Was he serious? Was he playing with her?
She shook her head and stood up, hugging her arms around herself. “Don’t fall for it,” she whispered to the silence. “Don’t be stupid.”
But that night, as she lay in bed staring at the ceiling, she couldn’t stop thinking about the way he looked at her. Like she was something forbidden… and he wanted to break every rule just to have her.
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CHAPTER: 2
MINE, EVEN IF YOU DON’T KNOW IT.
Celine had only been at her new school for two weeks, and already the rumors were flying.
“Did you hear? That new girl is living with Kiel Devaux.”
“Is she his cousin or something?”
“She’s too plain for him. No way he’s into her.”
Celine kept her head down, focusing on her books and ignoring the whispers. She wasn’t here to impress anyone. She just wanted to get through the day without drama.
But that wasn’t easy—especially when Kiel walked the same halls as her.
Everywhere he went, girls turned to stare. He was the definition of high school royalty—top grades, rich family, model-level looks. And yet… he didn’t smile. He barely spoke. And when his eyes landed on her in the hallway, she felt it like a burn on her skin.
One afternoon, as she walked toward the library, a boy approached her. Tall, cute, and obviously nervous.
“Hey,” he said, scratching the back of his neck. “You’re Celine, right? I was wondering if you wanted to sit with me and my friends at lunch tomorrow?”
Before she could answer, a voice cut through the air—sharp and dangerous.
“She’s not interested.”
Kiel stood just a few feet away, his eyes cold, his jaw clenched.
The other boy backed away, stammering an apology. Celine watched in disbelief as Kiel walked up to her, grabbed her wrist gently but firmly, and pulled her away from the hallway.
“Kiel—what are you doing?” she hissed.
“I don’t like him talking to you.”
She yanked her arm back. “You don’t get to decide who talks to me.”
He stepped closer, his voice a low growl. “I do when it comes to you.”
Celine’s breath caught. “Why?”
His eyes softened, just for a second. “Because you’re mine. Even if you don’t know it yet.”
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Late That Night…
Celine sat curled up on the balcony just outside her bedroom, the wind tugging gently at her hair. The night was quiet, but her mind was anything but.
She wrapped her arms around her knees, staring up at the stars as Kiel’s words repeated in her head.
“Because you’re mine. Even if you don’t know it yet.”
Why did those words make her chest ache and her stomach twist? It wasn’t fear—at least, not just fear. It was something else. Something deeper, more dangerous.
She had seen obsession before—in the eyes of boys who only wanted one thing. But this… Kiel didn’t want her like that. Or maybe he did. Maybe it was worse. Maybe he wanted all of her—her time, her thoughts, her heart.
And what scared her most was that a part of her wanted to give it.
Not because she trusted him. Not because he was kind. But because when he looked at her, she felt seen in a way no one else had ever made her feel.
But it’s wrong, she told herself. He’s your stepbrother. This isn’t normal.
She closed her eyes, pressing her forehead to her knees.
“God, what’s wrong with me…”
But in the silence, she couldn’t deny the truth blooming in her chest:
She was starting to want him back.
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CHAPTER: 3
TOO CLOSE FOR COMFORT
The house was quiet for the weekend. Mr. and Mrs. Devaux had gone on a business trip, leaving just Celine and Kiel behind.
Celine thought it would be easy—just keep to her room, avoid eye contact, and pretend everything was normal.
But nothing felt normal anymore.
Saturday evening, the power went out.
The entire mansion fell into darkness, lit only by occasional flashes of lightning outside. Celine stood in the hallway, hugging a blanket around her shoulders. The storm howled through the windows like a living thing.
She nearly screamed when she turned a corner and found Kiel standing there.
“You okay?” he asked, his voice low in the dark.
“I’m fine,” she lied. Her voice shook.
“You’re scared of storms,” he said. It wasn’t a question. He remembered. He always noticed things, even when he acted like he didn’t.
Celine looked away. “I’m not a child.”
“No,” he agreed. “You’re not.”
The silence between them stretched, heavy and electric.
Then he said, “Come to my room. I have candles.”
She hesitated, but the next crack of thunder made her flinch. Without another word, she followed.
KIEL’S ROOM......
It was the first time she’d been in there.
Dark walls. Clean. Minimalist. But warm in a strange way. He lit a few candles, casting golden shadows across the room. Then he sat on the edge of the bed and looked at her.
“You can sit,” he said quietly.
She did—far from him, at first. But the storm outside grew louder, and she found herself inching closer without realizing.
After a long pause, he spoke. “You don’t have to be afraid when you’re with me.”
Celine’s heart beat faster. “That’s the problem, Kiel. I’m not sure if I’m afraid of the storm… or of you.”
He looked at her, intense and quiet.
“I’d never hurt you, Celine. Even if I want you more than I should.”
Their eyes locked. Neither moved. Neither breathed.
And in that moment, both of them knew—they were already too far gone.
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Chapter: 4
THE KISS THAT SHOULDN’T HAPPEN.
The storm outside raged on, but inside Kiel’s room, time felt frozen.
Celine could hear nothing but the sound of her own heartbeat—and his breath, slow and steady, just inches away.
She didn’t know who moved first.
Maybe it was him leaning in. Maybe it was her, drawn like a magnet. But suddenly, their faces were close. Too close.
“Tell me to stop,” Kiel whispered, his voice raw.
She didn’t.
His hand gently cupped her jaw, tilting her face toward him. Her lips parted slightly, and then—he kissed her.
It wasn’t gentle.
It was desperate. Like he’d been holding himself back for too long. Like he wanted to pour all his confusion, frustration, and obsession into that one moment.
Celine kissed him back. She didn’t think. She couldn’t.
But the moment shattered when a loud knock slammed against the door.
“Celine?” a voice called from the hallway. “The power’s back. You okay?”
It was the maid.
Celine jolted, pulling away like she’d been burned. Her face flushed, her lips tingling.
Kiel sat still, his hands clenched into fists.
“I… I should go,” she whispered, not meeting his eyes.
He didn’t stop her.
As she stepped out of the room, heart racing, she knew everything had changed. That kiss wasn’t just a mistake—it was the beginning of something she wasn’t ready to name.
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CHAPTER: 5
SECRETS DON’T STAY HIDDEN.
Celine avoided Kiel for the entire next day. She skipped breakfast, locked herself in her room, and told herself the kiss never happened.
But the moment kept replaying in her mind—the way his lips felt, the heat in his eyes, the way he didn’t stop her. She wasn’t sure what scared her more: that it happened… or that she wanted it to happen again.
And then Monday came.
Back at school, everything felt normal—until it wasn’t.
During lunch, a girl walked up to her table. Tall, blonde, perfect smile twisted with something cruel.
“Hey, Celine,” she said sweetly, too sweet. “How was your weekend?”
Celine frowned. “Fine, why?”
“Oh, no reason,” she said, glancing over her shoulder. “Except… I saw you sneaking out of Kiel’s room. After midnight. During a blackout.”
Celine’s blood ran cold.
The girl leaned closer. “You two looked very close. I wonder what your sweet new mommy and daddy would think if they found out.”
Celine stared, speechless.
“Oh, don’t worry,” the girl added, flipping her hair. “Your secret’s safe with me… for now.”
As she walked away, Celine felt her world tilt.
Someone knew.
And in a house full of luxury and lies, that kind of secret could destroy everything.
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Chapter 6
MINE TO RUIN, MINE TO PROTECT
The rumors spread faster than wildfire.
By Tuesday morning, whispers trailed behind Celine in every hallway.
“She’s sleeping with him.”
“I heard they kissed.”
“It’s disgusting. She’s his stepsister.”
Celine kept her head down, hands clenched tight around her books. She wanted to disappear.
In the courtyard, she felt the burn of a hundred eyes. She wanted to scream—but then everything went still.
“Kiel’s here,” someone muttered.
The crowd seemed to part as Kiel walked through, face like stone, jaw tight. He didn’t speak to anyone. He didn’t look at anyone—except her.
He walked right up to Celine.
“What’s going on?” he asked, voice low and controlled.
She shook her head. “It’s nothing. It’s fine.”
But he already knew it wasn’t. He’d heard enough—he always did.
“I’ll take care of it,” he said.
And he did.
Minutes later, the blonde girl—her name was Ashlyn—was cornered behind the gym. Kiel didn’t yell. He didn’t even raise his voice. But the way he stood, the cold look in his eyes, the subtle threat in his words—it was enough.
“If you open your mouth about her again,” he said, “I’ll ruin you. Socially. Academically. Publicly.”
Ashlyn’s smile faltered. “Are you threatening me for her?”
“No,” he said, stepping closer. “I’m promising you.”
Back in class, Celine got a message on her phone.
From Kiel: No one will talk about you again. They don’t get to touch what’s mine.
Her fingers trembled. Not from fear. From something darker. Deeper.
And more dangerous than she was ready for.
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Chapter: 7
ALMOST.
The house was quiet again.
Too quiet.
Celine was in the music room, fingers drifting over the keys of the grand piano. She didn’t know how to play—not really—but the soft notes helped drown out the noise in her head.
Behind her, the door creaked open. She didn’t need to turn around to know it was him.
“I said I’d handle it,” Kiel’s voice came, low and rough.
She kept her gaze on the keys. “I didn’t ask you to.”
“No,” he agreed. “But you needed it anyway.”
Silence settled between them.
Then, he stepped forward. “Why are you avoiding me?”
“I’m not.”
“You are.”
She finally turned to face him. “Because I don’t know how to be around you anymore, Kiel. You kiss me one night and then protect me like some... some twisted guardian the next. I don’t know what you want from me.”
His eyes locked on hers, unreadable. “I want what I shouldn’t.”
He closed the space between them.
“I want to stop thinking about you. I want to stop waking up angry that you’re not mine. But every time you look at me like that… I forget why I’m supposed to stay away.”
Celine’s breath hitched. “You’re not supposed to want me.”
“I know,” he whispered, voice shaking. “But I do.”
His hand reached out, fingers grazing her cheek. She leaned into it before she could stop herself. Their lips were inches apart. Her heart pounded.
Then—just as his mouth brushed against hers—
Footsteps echoed down the hall.
They broke apart instantly, hearts racing, eyes wide.
Neither of them spoke as the sound passed, fading.
But the damage was done.
They didn’t kiss.
But they wanted to.
And it was only a matter of time.
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Chapter: 8
SUSPICION.
Dinner at the Devaux mansion was usually quiet. Polished silverware, soft clinking of glasses, polite conversation.
But tonight felt different.
Mrs. Devaux’s eyes lingered on Celine a little too long. Mr. Devaux asked questions he never usually cared about. And Kiel? He sat across from her, eating silently, his jaw tight, his gaze flicking toward her more times than it should have.
“Celine,” Mrs. Devaux said suddenly, “you’ve seemed… distracted lately. Everything alright at school?”
Celine froze, her fork halfway to her mouth. “Y-yes, ma’am. Just adjusting.”
Mrs. Devaux smiled, but it didn’t reach her eyes. “Good. You know, you can always come to me if something’s troubling you.”
Kiel shifted in his seat. His hand curled into a fist under the table.
Later that night, Celine slipped into the hallway, hoping for some air. But before she could take two steps, Kiel caught her wrist and pulled her into the shadows near the staircase.
“What are you doing?” she hissed.
“You’re pulling away,” he said, his voice sharp with frustration.
“I have to,” she whispered. “They’re starting to notice. If they find out—”
“I don’t care if they find out.”
“Well, I do!” she snapped, her eyes burning. “You don’t get it, Kiel. You can afford to be reckless. You’ll always have them, no matter what. But me? I don’t have anyone. If they think I’ve ruined their perfect son, I’ll lose this family too.”
His face softened, just slightly. “You’ll never lose me.”
The sincerity in his voice broke something inside her. For a moment, she wanted to believe him. To throw everything away and fall into him completely.
But instead, she pulled free, her voice trembling. “That’s exactly what I’m afraid of.”
She left him standing in the shadows, torn between fury and longing.
And for the first time, Kiel realized—he might lose her if he didn’t find a way to claim her completely.
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Chapter: 9
The Line Between Us.
Celine tried to put distance between them. She avoided his eyes at breakfast, left early for school, and stayed late in the library. Anything to escape the magnetic pull that threatened to drag her under.
But Kiel noticed.
He always noticed.
That Friday night, she slipped into the garden after dinner, needing the cool night air. She thought she was alone until a shadow appeared behind her.
“You’re avoiding me.”
Her chest tightened at the sound of his voice. She didn’t turn. “I’m not.”
“Don’t lie to me.” His footsteps crunched against the gravel as he moved closer. “You think if you hide long enough, I’ll forget this—what’s between us. But I can’t.”
Celine swallowed hard, her pulse quickening. “Kiel, we can’t. It’s wrong.”
He caught her wrist, gently but firmly, spinning her to face him. His eyes burned in the moonlight, dark and unyielding.
“What’s wrong,” he said, voice low, “is pretending you don’t feel it too.”
Her lips parted, but no words came out. Because deep down, she knew he was right.
“Kiel…” she whispered, trembling. “If they catch us—”
“They won’t.” He stepped closer, so close she could feel his breath against her skin. “Because I won’t let them. You belong to me, Celine. And I’m not letting you run from me anymore.”
Her heart thudded painfully. She should push him away. She should tell him no. But when his hand brushed her cheek, she leaned into it before she could stop herself.
For a fleeting second, the world fell away—no rules, no family, no fear. Just them.
And that was the moment she realized: if this continued, neither of t
hem would be able to turn back.
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Chapter: 10
The night of the Devaux family’s annual gala was supposed to be perfect. Glittering chandeliers, endless champagne, elegant gowns, and polished smiles. Guests filled the mansion, music and laughter masking the storm brewing beneath the surface.
Celine tried to play her part. She smiled politely, thanked strangers for compliments, and stayed close to Mrs. Devaux’s side. But her eyes kept drifting—to him.
Kiel.
He stood across the room in a sharp black suit, every girl’s dream and every boy’s threat. But his gaze never left her. Even surrounded by admirers, even when people spoke to him, his eyes found hers. Watching. Possessing.
She excused herself, slipping into the empty hallway for air. Her heart pounded. She couldn’t breathe under his stare.
But then—he was there.
“Running again?” His voice was low, dangerous.
She spun around. “Kiel, please—someone will see—”
“I don’t care.” He stepped forward, crowding her against the wall. “I’ve tried to stay away. I’ve tried to let you go. But I can’t. I won’t.”
Her hands pressed against his chest, trembling. “This will ruin everything—your family, my place here—”
“I don’t care about them,” he snapped, eyes burning. “I care about you. I’d burn this whole house down if it meant keeping you.”
Tears stung her eyes. “Why me?” she whispered. “Why are you so obsessed with me?”
He leaned closer, his forehead pressing to hers. His voice broke, raw and desperate. “Because you’re the only one who makes me feel alive.”
And then—he kissed her.
This time, there was no hesitation. No stopping. It was fire and hunger and every unspoken word crashing between them.
But as the kiss deepened, a sharp gasp echoed from down the hall.
They froze.
Ashlyn stood there, eyes wide, a cruel smile curling across her lips. “Oh my god,” she whispered. “I knew it.”
Celine’s blood turned to ice. Kiel’s grip only tightened
“Don’t,” he warned, his voice like steel.
Ashlyn smirked. “Too late. Everyone’s going to know.”
And with that, she turned and vanished into the crowd.
Celine looked up at Kiel, panic in her eyes. “What have we done?”
Kiel pulled her close, his voice dark, unwavering.
“What we were always meant to. And if they find out—let them. You’re mine, Celine. Even if the whole world burns because of it.”
She didn’t know if it was love. She didn’t know if it was madness.
ll she knew was that her fate was sealed.
And there was no turning back.
🔥 That’s the end—My Stepbrother’s Obsession.
Author: AGBEVENU DONKOR PHILLIP.
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