Betrayed By Blood—Nicholas Chavez x Fiancée!Reader
summary— you think you’re getting married to the love of your life but it all comes crashing down when you discover at your engagement party that nicholas has been cheating on you with your older sister. based on this request.
warnings— angst, cheating, heartbreak, betrayal.
a/n— i am such a slut for angst, keep it comin!
︵‿୨♡୧‿︵‿︵‿୨♡୧‿︵‿︵‿୨♡୧‿︵‿︵‿
You had always been the kind of person who believed in love wholeheartedly. When Nicholas entered your life three years ago, you couldn’t believe your luck. He was everything you’d ever wanted, kind, successful acting career, charming, and so ridiculously in love with you that it almost felt unreal. You were the envy of your friends, your family—hell, even your own self at times. He made you feel like you could do anything, be anyone. He was your best friend, your lover, your everything.
But what made it even more special was how seamlessly he fit into your world. The way he would light up when your family talked about their traditions, his willingness to learn about your culture, how your older sister, despite the years of distance between you two—had begun to bond with him. It was all so perfect. Nicholas had even made a point of getting close to your older sister, knowing how much she meant to you, even if it made you feel a twinge of discomfort sometimes. You were still getting used to the closeness between them, but it didn’t bother you much. She was just looking out for you, making sure the man you were about to marry was really the one.
Your sister was always a bit more distant from you. You’d never had the kind of bond that some people shared with their siblings—she was a few years older, more independent, and you’d always felt that divide. But when Nicholas came into the picture, something shifted. She started coming around more. She started asking about your relationship, checking in on how things were going. You even started enjoying the time she spent with him, seeing how happy he made you. Nicholas always appreciated your family and their cultural traditions, always joking around with your uncles about how they would “teach him the ropes” on making your culture’s food. They’d all gathered around him, with your uncles and cousins giving him their best cooking tips, even asking him to come to every cookout. It made you laugh how easily he fit in. It was exactly what you had always dreamed of—a man who loved you and respected your family’s values.
The engagement had come a little earlier than expected, but when he proposed to you, you couldn’t say no. You had been telling Nicholas for months that you didn’t want to wait forever. You wanted a future, you wanted a family, and most importantly, you wanted him. He had been apprehensive at first about rushing into things, but soon, he was on board. Your family was thrilled, your uncles teased him, and your mom cried with joy. Your sister, though not exactly the most emotionally expressive person, seemed genuinely happy for you both.
The engagement party was the culmination of everything, a massive celebration of your love. It was your moment, your chance to show everyone what Nicholas meant to you. And you couldn’t wait.
The night started off perfectly. Nicholas, looking dashing in his black suit, was by your side, his hand in yours as you made your rounds. Your sister, radiant as always, stood nearby, laughing with your family, as everyone celebrated the two of you. You danced with Nicholas, his lips brushing your neck as he whispered sweet things into your ear. You felt safe in his arms, protected. His smile was everything, and in that moment, you truly believed your life was everything you had ever wanted.
Your uncles, rowdy as usual, crowded around Nicholas, teasing him about being a part of their “cookout crew” now. They joked about his need to learn how to make your cultural dishes, like he’d be joining them for the next family cookout. You loved it. It felt like the piece of the puzzle you’d been waiting for your whole life, a family who accepted him, and him, genuinely embracing them.
But then, as the night progressed, you began to notice things. Little things. The way your sister kept laughing a little too loudly at Nicholas’ jokes. The way her hand lingered on his chest a bit too long when she made a joke, just a touch too intimate for your liking. You tried to shake it off, blaming it on the alcohol, on the festive mood. Your sister had always been affectionate with the people she liked, but something about the way she looked at him made your stomach turn.
It wasn’t even the physical closeness. It was the way she looked at him, like she was seeing him in a way you hadn’t seen before. You shrugged it off at first. He was your fiancé, after all. You shouldn’t be feeling jealous. She was your sister, and you wanted her to like him, to approve of him. This was nothing. Just a moment of insecurity.
But when Nicholas disappeared to the bathroom, you couldn’t shake the feeling. Half an hour had passed, and he still hadn’t come back. Your sister had gone missing too. They were both nowhere to be found, and a quiet alarm began to ring in the back of your mind.
You finally decided to check on them. You climbed the stairs, heels clicking against the floor. The music from downstairs muffled everything around you, and as you walked down the hallway, your heart beat faster with every step.
You remembered he’d said he was going to the bathroom. The upstairs bathroom door was slightly ajar, a thin line of light spilling out. You pushed the door open and peeked inside.
What you saw made your blood run cold.
Nicholas, your fiancé, was kissing your older sister with a passion that made your stomach drop. His hands were tangled in her curls, gripping it as if he couldn’t get enough of her. Her hands were all over his chest, moving to grip his bulge, and the way they kissed each other was everything you hadn’t seen from him in your three years together. There was nothing tender about it, nothing sweet. Just raw, ferocious hunger. He had her pressed against the counter, and they were so caught up in each other that they didn’t even hear you.
You froze, every ounce of warmth drained from your body. You couldn’t breathe. Your mind refused to accept what your eyes were seeing.
And then, your sister’s voice, breathless, echoed in the room.
“Take me right here,” she purred.
Nicholas smirked against her lips. “Later tonight,” he murmured, voice thick with desire. “Tonight, I’ll give you this dick and everything you want.”
Your sister laughed, a sound you would never forget. “She’s so stupid,” she said, hands trailing down his chest. “Thinking you actually chose her.”
And Nicholas, your fiancé, laughed. He laughed.
The sound was like a knife to your heart.
You couldn’t watch anymore. You turned and stumbled away from the door, the world around you spinning. Your legs felt weak, your heart pounding in your ears. You had to get away. You had to get out of there.
You made your way back down the stairs, your brown skin feeling somehow drained of color, your chest tight with the weight of everything crashing down.
You sat on the couch, numb, staring into the distance as the laughter and chatter of the party continued around you. Everyone was so oblivious. How could they be so blind?
You didn’t know how long you sat there, staring at the empty glass in your hand, feeling the bile of betrayal and heartbreak rise in your throat. But the truth was clear now. The person you had trusted most in this world, the man you thought would be yours forever, had betrayed you. And your sister, the one person who was supposed to have your back, had been the one to help him destroy everything.
Everything was fucking over.
The world felt like it was closing in on you. You stood in the corner of your sister's yard, away from the noise and the chaos of the party, trying to breathe in the cool night air, but it didn’t help. It was all too much. Your thoughts raced as your mom, drunk on Hennessy, slipped out the door to check on you.
“Are you okay, baby? You don’t look so good,” she slurred, her words barely hanging together.
“Yeah, I’m fine, Mom. Just a little too much to drink,” you said quickly, offering her a smile, though it felt like your face was frozen. You didn’t want her to see the turmoil churning inside you. You didn’t want anyone to see the cracks in the perfect picture you had spent so long trying to paint.
She frowned slightly, swaying on her feet as she stared at you with unsteady eyes. “You sure? You seem so off. Maybe lay off the Henny, huh?”
You laughed weakly, swallowing the bitter taste of your own anger. “Yeah, Mom, I’m good but maybe you should too, Just need some air. I’ll be fine, I promise.”
She nodded, barely convincing herself, before she staggered back inside. You could still hear her slurring through the door. “You’ve got such a good man, don’t forget that,” she called over her shoulder, her voice drifting on the warm night breeze.
“I know, I thought so too,” you said under your breath.
But now, everything had shattered. You stood in the cold, looking out at the darkened street, your thoughts spiraling into a whirlwind of doubt. Maybe she’s right, you thought. Maybe I was stupid. So stupid for not seeing it earlier.
The signs had always been there, hadn’t they? The way Nicholas and your sister would hang out without you, their bodies too close, the long hugs that lasted a bit too long. The way his hands would graze her shoulder or her back, like it was something casual—like it didn’t mean anything. But you had been so blinded by wanting to prove to yourself, to your family, that Nicholas was the one. That he loved you. And that your sister, the one person who you thought would always have your back, would approve.
You had wanted her approval so badly.
The signs were obvious, though. The way he would always find a reason to make her laugh, to make her feel special. He’d tell her jokes only she seemed to find funny, or the way he’d always help her with things around the house when he was at your family gatherings. The way he would stare at her ass when she’d walk away from the table, thinking you didn’t see it. The small, subtle touches, how he always found a reason to touch her arm or her back. It had been happening all along, and yet, you had made excuses. They’re just close, they’re family.
But it wasn’t just that. It was the way they’d look at each other. It was the way they had always made quick excuses to disappear for a few moments, always sneaking off together, but you had never thought much of it. Just friends, you had told yourself. But now, standing in the dark, it hit you like a ton of bricks.
They had been sneaking around behind your back for so long, and you had been too blind to see it. How could you have been so stupid?
You suddenly felt dizzy, as if the weight of it all had just crashed down on you all at once. You knew you couldn’t stay out there much longer. You had to get away, had to leave. You couldn’t stand to see their faces, couldn’t stand to pretend that everything was okay.
Before you could even collect your thoughts, you felt a presence behind you.
“What are you doing out here, mama?” Nicholas’ voice cut through the silence. It was warm, too warm, and it made your skin crawl. You didn’t turn to face him. You didn’t want to.
“I just needed some air,” you lied, trying to sound casual. You didn’t trust your voice. “The alcohol’s got me feeling all weird.”
He stepped closer, as if concerned, his hand coming up to touch your arm. “Well, let’s get you back inside. What’s wrong?”
You winced, flinching instinctively as he tried to kiss your cheek. You jerked away from him. “I’m not feeling too great, honestly,” you muttered, your voice breaking just enough to make him pause.
Nicholas laughed lightly. “It’s just the booze, babe. You know how it gets you all—worked up. Hope you’re not getting cold feet now,” he added, his tone teasing, but his eyes scanning your face too closely. “You know I love you, right?”
The words hit you like a punch to the gut. You fought the urge to lash out, to scream at him, a bitter laugh. You love me? Sure, you do.
You managed a tight smile, one that didn’t quite reach your eyes, and you nodded, playing the part. “I know, Nicholas. I know,” you said through gritted teeth.
You both made your way back inside, where the party was still in full swing. Your mom was laughing with your uncles, and your sister, who seemed to have too much to drink. She was swaying a little too much, her lipstick smudged, her hair a little messier than usual.
You couldn’t help but stare at her. How could she? How could she betray you like this? The woman who had held you as a baby, the woman who was supposed to protect you, be your big sister—your own flesh and blood.
She walked up to you with that sickly sweet smile, her hand on your arm, as if nothing was wrong. “You guys should stay over tonight. You're both too drunk to drive,” she said, her voice syrupy, but you could hear the underlying smugness.
You forced a smile, but it was more of a sneer. You didn’t want to look at her, didn’t want to be in the same room. “Thanks, but I think we’re going to head out,” you said, your voice cold and distant.
“Are you sure? Also, you look beautiful tonight,” she said, a little too loud, her eyes flicking to Nicholas. “You’re so lucky to have him.” She smiled at him, that smile that made you want to throw up.
You could barely stand it. “Yeah, I’m lucky,” you muttered. “But we should get going.”
Your sister didn’t argue. Instead, she waved it off, telling Nicholas that he should clean up with her, but you cut her off sharply. “No, she said she’d clean up, so Nicholas just come to bed since she wants us to stay so bad,” you said to him, your voice firm. He didn’t question it, but you could see the brief flash of surprise in his eyes.
They both paused. Shocked that you’re not letting them play their little game anymore.
He nodded reluctantly, muttering something under his breath, and followed you upstairs.
Once in the room, you started to get ready for bed. Nicholas sat on the edge of the bed, telling you how much he loved your family and how he couldn’t wait to be a part of it all. You wanted to scream at him, tell him that he was already part of it—in the worst way possible.
As you climbed into bed, you turned to face away from him, feeling the warmth of his body beside you, knowing how wrong it all was. He pressed kisses along your back, but you flinched with every touch, every word he whispered. You knew exactly what he was doing. He was trying to lull you to sleep so he could slip away.
You pretended to fall asleep, lying still as he shifted beside you. He waited a few minutes before slowly nudging you off of him, making sure you were still “asleep” before getting out of bed. You kept your eyes closed, though your heart was pounding in your chest. You heard the sound of him leaving the room.
The tears started to come then. One single tear fell from your eye, and that was it. He was really going to do it. He was going to go fuck your sister, and you knew it wasn’t the first time.
The tears didn’t stop as you cried yourself to sleep. You didn’t know when he came back to bed, but by then, you didn’t care.
The next morning, the air was thick with tension. Nicholas, ever the actor, was trying to act like nothing was wrong, all smiles and charm, but you couldn’t look at him. Not after everything.
“You okay?” he asked, trying to make conversation on the car ride home. His hand rested on your thigh, cold, stiff. Not warm like it used to be.
You didn’t answer. You just stared out the window, trying to keep yourself together.
When you got home, you walked straight to the bedroom without a word. He followed behind, still trying to act normal, trying to act like he hadn’t just betrayed you in the worst way possible.
You turned to him, your voice hard, cold. “How long?”
He looked at you, confused. “How long what?”
“How long have you been fucking my sister?” you spat. His face went white.
He started rambling, trying to justify it, trying to come up with excuses, but you stopped him cold. You looked him dead in the eyes, your voice low but sharp enough to pierce through his fumbling excuses. “Cut the bullshit, Nicholas. How long have you been fucking my sister?”
His face drained of color, and for a split second, you saw panic flicker in his eyes. But then he straightened up, his mouth opening and closing, struggling to form words. He tried to spin some story, but it was all nonsense, just meaningless rambling that you couldn’t stomach.
“I— I didn’t mean for this to happen,” he stammered. “I’m sorry, baby, I—”
You cut him off, disgust twisting your insides. “Fuck you. You’re not sorry. You’re only sorry you got caught.”
His face fell. He opened his mouth again, but you weren’t listening anymore. You pulled the ring from your finger and tossed it at him with all the force you could muster. The diamond caught the light before it clattered to the floor, a symbol of everything that had ended between the two of you.
“Don’t. Don’t even try to fix this,” you spat, your voice cold, firm. “I’m done. Get the fuck out. I don’t want to see your face again.”
He took a step back, his eyes wide with panic, a mix of guilt and anger on his face. He pleaded with you, but you didn’t hear him. You didn’t want to hear him. You could barely look at him.
“I can’t believe you did this,” you whispered, the betrayal so thick in your chest it was suffocating. “I trusted you. And I trusted her.” You let out a bitter laugh, shaking your head. “I never want to see either of you again.”
Nicholas looked like he was going to say something more, but he didn’t. His face was a mess of guilt, frustration, and desperation as he turned on his heel, heading for the door.
When the door slammed behind him, it felt like the last thing holding you together had fallen apart. The silence that followed felt deafening, and as soon as you heard the sound of his car pull away from the driveway, the floodgates opened.
You had never felt so broken in your life.
You didn’t wait for long before pulling out your phone and dialing your sister’s number. It rang a few times before she picked up, her voice so sweet, like everything was fine. Like nothing had changed.
“Hey sis! What’s up?” she said, her tone light.
You didn't waste time with pleasantries. “Fuck you bitch,” you snapped, your voice filled with venom. “Two-faced whore. I never want to see you again.”
There was silence on the other end. You could almost hear her gasp, her breath catching as she processed the words. But you didn’t give her a chance to respond.
“Stay the hell out of my life. I never want to hear from you again. Ever,” you added, your voice colder than ice.
You didn’t even wait for her to respond before you hung up. You couldn’t bring yourself to hear her lies. The texts and calls came flooding in immediately, frantic apologies, explanations that you knew were all just bullshit. You didn’t care.
You blocked her number without a second thought.
The betrayal was suffocating, and you couldn’t stop shaking. You wanted to scream. You wanted to burn it all down. But instead, you curled into yourself on the bed, every part of you hollow. You couldn’t even bring yourself to cry at first. The tears wouldn’t come, not until the numbness wore off, and then they came in a flood, unstoppable, overwhelming.
Your heart felt like it was ripped in two. Betrayed. By the man who had promised to love you forever. By the sister who had held you when you were small, the one person who had always been your protector. Now she was just another person who had turned her back on you.
You lay there, letting the tears fall until there were no more to shed. And when it was over, there was nothing left but silence and a cold, gnawing emptiness.
The next few days passed in a haze. You didn’t leave your room, didn’t talk to anyone. You didn’t want to. You couldn’t.
When you finally found the strength to move, to get out of bed and go through the motions, everything felt like a shadow of what it used to be. Your heart was still broken, but the anger was sharper now. You were angry at them both. Angry at yourself for not seeing it sooner. Angry at your family for not being who you thought they were.
But most of all, you were angry because you knew deep down that you would never trust anyone the same way again. How could you?
The world felt different now—like it had shifted, and you were no longer sure where you stood.
But in that anger, there was clarity. You were done with Nicholas. You were done with her. You didn’t need them. You would be okay. Maybe not right now, maybe not in the next few months, but eventually, you would find peace.
And you’d never let anyone—anyone, take that away from you again.
The betrayal was deep, but so was your strength.
You weren’t going to let them destroy you.
