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reidsbookclub · 3 months ago

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Vows of Rivalry

Authors Note: MY FIRST AARON FIC AHH!! Idk what is scarier the fact that this is FINALLY going out to the world or the fact that my first Aaron fic does not follow cannon events. Either way I would really appreciate any feedback you guys can give me. gif credit to original creator. I had it saved on my laptop so I really do not remember

special thanks to @boldlyvoid for beta reading the first draft of this fic. pairing: Aaron Hotchner x female reader

Without further ado here is Vows of Rivalry.

Mock trial season. Every law student’s worst nightmare. Except for one.

Most students dreaded the possibility of being pitted against Aaron Hotchner—reigning champion since his first year. Hotch was renowned for his ruthless precision, impeccable argumentation, and the intimidating scowl that seemed permanently etched onto his face. But for Y/N Y/L/N, the prospect of facing Aaron was anything but dreadful. In fact, she relished it.

She could see it now: his jaw clenched, his lips pressed into a thin line, his eyes narrowing whenever she’d poke holes in his carefully laid arguments. For her, it wasn’t just about winning. It was about watching Aaron Hotchner, the unflappable law prodigy, completely lose his composure.

That day was no different. The mock trial courtroom buzzed with the tension of impending arguments, the air crackling with unspoken competition. Y/N adjusted her blazer, her eyes scanning the room for her favorite opponent. There he was, already seated with his ever-present briefcase of legal weapons, jaw set and brows furrowed as he reviewed his notes. She couldn’t help the smirk tugging at her lips as she walked to her seat across from him.

The mock trial had barely begun, but the room felt like a pressure cooker. Y/N had just finished outlining her opening argument when Aaron stood to cross-examine her witness. As always, he delivered each question with surgical precision, his voice sharp, his gaze colder than a winter morning.

But she wasn’t backing down.

“Your Honor,” she interrupted smoothly, “he simply doesn’t have the evidence necessary for—”

“Evidence?” Aaron interrupted, his calm demeanor finally cracking. He looked like he was about to explode, his face flushed with frustration. “Evi—Jesus, woman, you make me so annoyed sometimes. I just want to very publicly divorce you!”

The courtroom fell silent, and Y/N stared at him, stunned by his outburst. Then, instead of being thrown off, she smiled. “You’d have to marry me first, Hotchner.”

Aaron stormed off, leaving the room in a buzz of shock. The judge cleared his throat awkwardly and called for a recess, but all Y/N could think about was how much she had enjoyed watching him unravel.

Neither of them realizing that the judge for this mock trial, their peer Marcus, had a murderous look trained to where Aaron had left.

Flash forward — Present day

The BAU office was quieter than usual, the team scattered as they worked on different aspects of their current case. Aaron Hotchner sat at his desk, tapping his pen absently against a case file, the rhythm of his movements betraying his usual calm. His mind wasn’t on the case—not entirely. Instead, it kept wandering back to Y/N. Their history, their rivalry in law school, the way she always managed to get under his skin.

His mind began to drift to that impulsive night in Vegas that had been the culmination of all that tension

The neon lights of Las Vegas blared like a siren song, luring Y/N and Aaron into a world of wildness and excess. After an exhausting week of mock trials, they and their law school classmates had decided to blow off some steam and take a trip to Vegas of all places.

“Okay, Hotchner, let’s see if you can handle another round!” Y/N challenged, her voice slightly slurred as she leaned against the bar, her hair a tousled mess.

Aaron rolled his eyes, his own drink barely clutched in his hand. “I think you’ve already had enough, Y/N. You know, you might actually lose your pants at the blackjack table this time.”

“Ha! Please, I’m a betting goddess! You’re just jealous because I outsmarted you in court last week!” she shot back, leaning in closer, her breath a mixture of fruity cocktails and determination.

“Outsmarted me? You mean you got lucky!” Aaron replied, smirking.

“You know what? Let’s get married!” she taunted, downing the last of her drink.

“What?” Aaron burst out laughing, nearly spilling his drink. “You’re kidding, right?”

“Nope!” Y/N declared, her eyes sparkling with mischief. “Let’s do it. Vegas style! You and me! A wedding! Right now!”

He glanced at her, both amused and wary. “You realize that you’re completely drunk out of your mind, right? You know what they say about Vegas weddings. And I don’t want to be part of a ‘you’re-who-I-got-drunk-with’ story.”

She leaned in closer, her voice dropping to a conspiratorial whisper. “Come on, Hotch! It’ll be epic! Plus, we’ll have a great story to tell during our class reunion 10 years from now about how we got wasted and tied the knot on a whim!”

“Yeah, and how you lost all your money at blackjack the same night!” he shot back, unable to hold back his laughter.

“Shut up!” she laughed, but then her expression shifted to one of playful defiance. “I dare you to come with me! We’ll show everyone that even stoic Aaron Hotcher can do something crazy with the right company! Or are you too scared”

Aaron raised an eyebrow, a grin spreading across his face. “You think I’m scared? You really want to drag me into this madness?”

“Absolutely!” she insisted, grabbing his hand and pulling him towards the chapel like a determined toddler. “C’mon! What’s the worst that could happen? We’ll wake up tomorrow, laugh about it!”

“Or we might actually end up married,” he replied, a mixture of thrill and dread filling him as they reached the chapel’s entrance. “What’s your plan if we do?”

“Um… we’ll just call it a really fun mistake!” she quipped, giggling as they stumbled into the small, tacky chapel. Elvis’s “Can’t Help Falling in Love” played in the background, setting the perfect absurd tone.

Inside, they approached the altar, barely able to contain their laughter. The Elvis impersonator greeted them, his eyes twinkling as he took in their disheveled appearance.

“Welcome to the chapel, lovebirds!” he boomed, clearly accustomed to drunken couples making rash decisions.

“Lovebirds?” Aaron muttered under his breath, shooting Y/N a glance.

“Shhh! Just go with it,” she hissed, nudging him with her elbow. “It’ll be fun!”

The officiant cleared his throat. “Do you, Y/N, take this man to be your lawfully wedded husband?”

“Sure, why not?” Y/N said with a grin, her tone decidedly nonchalant. “I mean, he does make a decent man most of the time.”

“Y/N!” Aaron exclaimed, mortified and amused at her flippancy.

“And do you, Aaron, take Y/N to be your lawfully wedded wife?” the officiant continued, a bemused smile on his face.

Aaron shrugged dramatically, looking at Y/N with exaggerated seriousness. “I guess so. As long as she promises not to annoy me with her terrible jokes and awful puns.”

“Hey!” Y/N shot back, mock-hurt. “I’ll have you know my jokes are legendary!”

“Legendary at making people cringe,” he replied, chuckling as the officiant tried to stifle a laugh.

After a few more playful jabs and exaggerated vows—filled with drunken laughter and outrageous promises—they exchanged rings made of plastic and signed their names on the chapel’s official log, feeling giddy and foolish.

As they stumbled back out into the glittering chaos of the Vegas Strip, their marriage license in hand, they couldn't help but laugh that they even printed out one.

“Is this even legal?” she asked not expecting a reply, glancing at their license as if it might disappear into thin air. “You would think that for a pair of law students we would know the answer”

Aaron only shrugged, too drunk to think, tossing an arm around her shoulders. “Let’s hit the casino again. After all, what happens in Vegas stays in Vegas, right?”

As they walked, their banter flowed freely, filled with giggles and playful nudges. They knew they would laugh about this ridiculous night for years to come, even if they had to figure out how to disentangle themselves from the drunken mess they had just created.

The next morning had been awkward, to say the least. They had agreed to get the marriage annulled immediately, laughing about how ridiculous it all was. Except, somehow, neither had followed through on the paperwork. It had slipped through the cracks of their busy lives.

Now, his mind kept wandering back to Y/N wondering where she was now. He couldn’t help but notice how the victims all had a striking resemblance to her.

The team had been called in to investigate a series of kidnappings, and the more they dug, the clearer it became for him how they all looked like Y/N. Where was she now? He couldn’t help but think. Was she safe?

He leaned forward, pinching the bridge of his nose, the weight of it all pressing down on him. He had to find her, his protective instincts kicking in.

“Did you find something, Garcia?” Hotch asked, breaking the silence of his office when Penelope Garcia appeared at the door, her fingers flying across her tablet.

She hesitated momentarily, her usual cheerful energy replaced with a seriousness that made Hotch’s pulse quicken.

“I… I think so, sir,” she said, her eyes widening as she glanced at her screen. “Does the name Y/N Y/L/N ring any bells?”

Hotch’s heart stopped for a moment. His eyes locked with Garcia’s, his mind racing. “Yes,” he replied, his voice strained. “She’s… my wife.”

Garcia’s jaw dropped. “Wait, what?”

Hotch took a breath, the memories rushing back. “We got married… years ago. It was a mistake. We were supposed to get divorced, but… it never happened.”

Garcia blinked rapidly, trying to process what he had just revealed. “So, you’re telling me… you’re still married?”

“Yes.” Hotch’s voice was tight with emotion.

He stood abruptly, grabbing his jacket from the back of his chair. “What did you find?”

Garcia quickly shifted gears, “well, her co-workers reported Y/N missing yesterday after not showing up to work,” pulling up a map of the latest victim location. “Y/N’s phone pinged from an industrial area near the docks about an hour ago. The unsub is still playing games, but I believe she is the latest victim, sir. It appears he stalked her online for a couple of weeks’”

Hotch’s jaw tightened as he listened, his professional side taking over. “Send me the coordinates. I want the team assembled now.”

~~~~~

The BAU team had nearly arrived to the warehouse, moving swiftly and silently. Hotch led the charge, his mind a blur of tactical planning and personal fear. He couldn’t let anything happen to her. Not after all these years. Not when he was just realizing how much she still meant to him.

Inside, the air was thick with dust and decay. The unsub had clearly been holding Y/N here, but as they searched the space, there was no sign of her or the unsub.

Hotch’s phone buzzed. A new message.

It was from Y/N’s phone, but the words were clearly from the unsub:

“Do you remember? Do you remember how much you tried to hate her? Tried to hide much did you love her? You won’t find her in time, Hotchner.”

So this was someone from their past, but who? While trying to think of anyone that would’ve been trying to get close to her and hating him he couldn’t help but recall one fateful winter day that cemented them as academic rivals while also cementing his love for her.

The cold bite of winter air seeped into the library, where a few stubborn law students huddled around textbooks and laptops. Outside, snowflakes drifted lazily, painting the world in white, but inside, a different kind of storm was brewing.

Aaron Hotchner glanced up from his notes, his sharp gaze falling on Y/N, who sat across from him in their study group. The usual fire was in her eyes, and the faintest trace of a smirk tugged at the corner of her lips as she readied herself for another round of their never-ending banter.

“You’re completely wrong, Hotchner,” she said, her voice sharp and teasing. “Your interpretation of the case law is so off-base, I’m surprised you’re even here right now.”

Aaron raised an eyebrow, a smile tugging at the corners of his lips. “Is that so? Enlighten me, then. If you can, that is.”

Y/N’s face flushed, her hazel eyes narrowing in mock-annoyance. The faint crinkle of her nose appeared—the one that always seemed to surface when she was riled up. It was something he had started to look forward to, something that drove him to keep pushing her buttons just to see that reaction.

“Don’t tempt me,” she said with a huff, leaning forward to point at his notes. “Right here, you missed the entire point of the ruling. You can’t just cherry-pick the facts that support your argument. You’re better than that… or at least, I thought you were.”

Her words were laced with sarcasm, but Aaron found himself barely hearing them. Instead, his mind focused on the way her hair fell loosely over her shoulders, how her cheeks were tinged pink from the warmth of the heated room, and how that fire in her eyes sparked every time they clashed.

She was beautiful in a way he hadn’t allowed himself to fully acknowledge until now. He’d always admired her intellect, her tenacity, the way she stood her ground no matter how hard he pushed. But today—today something shifted. It wasn’t just respect or admiration anymore. It was something deeper, something that hit him square in the chest as if knocking the air out of him.

God, he loved seeing her like this—passionate, focused, and utterly unrelenting. His heart raced as he watched her argue her point, lips moving with a confidence that captivated him. He’d always riled her up for the sake of competition, but now he realized it was more than that. He loved it. Loved the way her nose crinkled, the way her skin flushed pink when she got under his skin and knew it.

She was like a force of nature, and Aaron—against all logic—was caught in her storm.

“Are you even listening to me?” Y/N’s voice cut through his thoughts, her eyes narrowing further as she leaned back, arms crossed.

Aaron blinked, shaking off the haze of his realization, and quickly returned to their debate. “Of course I am. I’m just trying to figure out if you actually believe that nonsense you’re spewing.”

Her mouth fell open, and that familiar spark lit in her eyes again. “You’re impossible!” she snapped, throwing her pen down dramatically.

Aaron bit back a grin. “And you’re predictable.”

That earned him a glare, but he could see the amusement behind it. She thrived on this, just like he did. The banter, the push and pull—it was their language, and he’d never felt more alive than when they were like this. But now it came with a deeper ache, a longing he hadn’t anticipated.

Later that day, after they’d packed up and left the library, Aaron lingered near the hallway, stuffing his textbooks into his bag. Y/N’s voice drifted from around the corner, chatting with her friends.

“Are you sure you don’t want to come out with us tonight?” one of the girls asked. “Marcus has been wanting to ask you out and you always shoot him down.”

Y/N laughed softly. “No, I’m good. I promised myself I’d focus on law school. No distractions. I’m staying single and just keeping my head down until graduation.”

Aaron froze, his breath catching in his throat. The words stung more than they should have. He had just admitted to himself that he might be falling for her, and now—now she was putting up a wall, and he wasn’t even on the other side of it.

Single. Focused on her studies. No distractions.

It was clear where she stood, and Aaron felt a knot of frustration tighten in his chest. He could never compete with her ambitions, nor would he try. He respected that about her. But still, it hit him hard, this quiet admission of hers that he had no place in her plans.

He stood there, hidden just out of view, feeling the weight of her words settle over him. He had never been one to chase something he couldn’t have, and Y/N had just made it clear she was determined to stay unattached.

But if he couldn’t have her the way he wanted—if she would never see him the way he saw her—then he’d find another way to stay close to her.

That night, as snow continued to fall softly outside the window, Aaron made a silent vow to himself. If being her rival was the only way to be near her, then so be it. He would challenge her, argue with her, push her to her limits—because that’s when she was at her best, and it was the only way he could keep her in his life.

If being her academic rival was all he could be, then he would make sure to be the best damn rival she ever had.

The blood drained from his face as he reread the words. This was personal. The unsub had been watching them—watching their past, their history. And now, Hotch knew he was the key to finding Y/N. Could it have been Marucs? Marcus was the other relentless suitor that y/n had. Could it be him?

He called Garcia, “we are almost at the location Y/Ns phone pinged last. Look into Marcus for me, he went to school with us” he ordered

“Looks like Marcus has had many girlfriends that resemble Y/N physical appearance since graduating, up until last year in which his girlfriend broke up with him to marry someone else. The wedding date coincides with the first killing sir”

“Thanks Garcia” he said as they arrived at the location.

The SWAT team had cleared the perimeter, and Aaron Hotchner stood just outside the door of the dilapidated warehouse. The once-industrial building had long since been abandoned, its cracked windows and rusting metal exterior fitting the profile of a man like Marcus Chambers—someone who had faded into the shadows, but had never truly disappeared.

Aaron’s heartbeat thudded heavily in his ears, the only sound louder than the quiet murmur of the team communicating over comms. They’d been tracking Marcus for days, and this was their best lead yet. But there was one glaring problem—it seemed Y/N wasn’t here.

And time was running out.

The door to the warehouse creaked open, and Aaron nodded to Morgan and Prentiss, signaling them to enter first. Inside, the air was stale and filled with the faint scent of metal and dust. There were scattered pieces of old machinery and boxes, but it was otherwise empty—save for a table and the man seated at the far end of the room.

Marcus.

His dark eyes were fixed on the team as they approached, his mouth curled into a bitter smirk. He didn’t make any effort to move or run, didn’t flinch as SWAT flooded in behind them, guns raised and voices sharp with commands. He sat there, unbothered, like he’d been expecting them all along.

Aaron’s jaw clenched as he approached, unable to shake the burning anger and desperation clawing at him. Y/N’s life depended on this, and every second felt like an eternity.

“Where is she?” Aaron’s voice was low, controlled, but the fury beneath it was unmistakable.

Marcus’s eyes flickered with amusement as he leaned back in the chair, crossing his arms lazily. “You think it’s that easy, don’t you, Hotchner? You swoop in, play the hero, and save the day.” He sneered. “But not this time.”

Aaron’s fists clenched at his sides. The rage boiling inside him was barely contained, but he couldn’t afford to lose control now. He couldn’t let Marcus see just how much he was getting to him. He wouldn’t give him the satisfaction.

“I’m not playing games with you, Marcus,” Aaron growled, stepping closer, his voice like steel. “Tell me where she is, or I swear you won’t like how this ends.”

Morgan stepped forward ready to jump and protect his boss and close friend, hand resting on his gun, ready for any sign of danger. “You’re surrounded, man, you’re not walking out of here, so you might as well make it easier on yourself.”

Marcus chuckled darkly, shaking his head as if amused by the entire situation. “Easier? For me? This was never about making it easy, agent.” His eyes drifted back to Aaron, and there was something unsettling in his gaze—something cold, unhinged. “This was about making you pay.”

Aaron felt the weight of those words, and it took everything in him to keep his expression neutral. He had known Marcus back in law school—had always seen him as a man with an inferiority complex, always jealous of anyone who succeeded around him. But that was nothing compared to the bitterness Aaron saw now.

“This is about Y/N, isn’t it?” Aaron said, voice steady but cutting. “You’ve hated me since the mock trial when I said I would marry her, but Marcus you should know we were just rattling each other”

“Bullshit” Marcus yelled irritated

Marcus’s smirk widened. “You have no idea, do you? No idea what it felt like watching you—golden boy Aaron Hotchner—get everything handed to you. The grades, the reputation, and then… her.”

Could he really know about Vegas, about them actually marrying? Aaron thought. It wasn’t as if they actually lived like husband and wife, they had just forgotten to annul the marriage, granted, as far as he knew neither of them had dated after that day. Could he really be this infuriated by a piece of paper? Aaron decided not to focus on the pang of guilt he felt by thinking of the marriage to the love of his life as just a “piece of paper” he had to figure out where she was before it was too late.

“I watched you two,” Marcus continued, his voice laced with bitterness. “Watched you marry her like it was some joke. Like she was some prize you could just win and forget about.”

Aaron’s stomach twisted. It all went back to Vegas. The night they’d gotten drunk, the night he and Y/N had woken up with rings on their fingers and hazy memories of how they got there. A wedding that should have been forgotten, annulled, but had somehow turned into something much more permanent, a silent promise that they would always be there for each other. A promise he couldn't break, not after all this time.

And Marcus had been there. He’d seen it all. And he was dead set on breaking the fragile bond that was made that night between Aaron and Y/N.

Suddenly, a faint sound caught his attention—a soft, muffled cry coming from the back of the warehouse. Hotch motioned for the team to follow as they approached a locked room. Kicking the door open, his breath caught in his throat.

There she was. Y/N. Bound and gagged but alive.

You were there that night?” Aaron asked, her eyes narrowing in suspicion.

Marcus nodded, his eyes flickering with something darker—something dangerous. “I saw it all. You don’t even remember, do you? How you laughed about it. How you said it didn’t matter, how it would all be a funny memory years down the road. But it mattered to me.”

Aaron’s chest tightened. Yes, there was laughter that night. But, he hadn’t brushed it off like it meant nothing. It had scared him the days after how much that marriage had meant to him. But Marcus had twisted that memory, had held onto it all these years, letting it fester into something deadly.

“This isn’t about Vegas, Marcus,” Aaron said coldly. “This is about your obsession. You’re angry because you never stood a chance.”

Marcus’s smirk faltered for a brief second, but the madness in his eyes only intensified. “I didn’t stand a chance because you took her from me before I even had one.”

Aaron’s fists clenched tighter, his patience fraying. “I'm done with this, I’m done with you. Tell me where she is. Now.”

Marcus chuckled, leaning forward in his chair, his voice dripping with malice. “You really think I’d make it that easy for you? No, Hotchner. This is your punishment. You don’t get to save her this time.”

Aaron’s blood ran cold, a chill settling deep into his bones. He stepped closer, towering over Marcus, his voice deadly calm. “You tell me where she is, or I swear–” Aaron couldn’t finish his threat, noticing Marcus’ eyes flickered to the timer he set on a nearby table.

Marcus met Aaron’s eyes, his smile fading into something more sinister. “You’re too late. She will be dead in 20 minutes.”

Aaron’s heart stopped. Too late. No, that couldn’t be possible. Not Y/N. Not when they were so close.

“Where is she?” Morgan demanded, his voice rising.

Marcus didn’t answer. His gaze drifted lazily around the room, savoring the tension, the desperation on Aaron’s face. “You’ll never find her. She’s too far gone.”

Aaron lunged forward, grabbing Marcus by the collar and hauling him to his feet, rage boiling over. “Where is she?!”

Morgan and Prentiss moved to pull Aaron back, but he was already too far gone. Marcus laughed in his face, taunting him with the one thing Aaron couldn’t afford to lose: time.

And then, in a quiet, venomous whisper, Marcus finally spoke.

“You’re looking in the wrong place.”

The words sank in, chilling Aaron to his core. Marcus had known all along that they’d come here, had expected this, planned for it. And while they wasted time finding him—Y/N was somewhere else.

Somewhere Aaron might never reach her in time.

He released Marcus, stepping back, chest heaving with frustration and panic. They had him in custody, but it wasn’t enough. Not without Y/N.

They were running out of time, and Aaron knew he couldn’t afford a single second more

Back at the BAU Penelope Garcia’s fingers flew across the keyboard, eyes glued to the flurry of data populating the screen. She’d been digging into Marcus's background, searching for anything that could lead them to where he was keeping Y/N. “Come on, come on…” she muttered under her breath, frustration building—until suddenly, a detail popped up, too familiar to ignore. “Wait a minute,” she whispered, freezing. She leaned closer, eyes widening as the puzzle pieces clicked. “The old library!”

Spencer Reid, sitting across from her, looked up from the stack of files he was pouring over. “What about it?”

Garcia spun her chair toward him, her face pale with realization. “That abandoned library—the one Hotch and Marcus used to study at with the group. It was scheduled for demolition last year, but the plans were scrapped. No one’s been there in years.”

Reid’s eyes lit up with recognition, and his voice dropped. “It’s isolated. Quiet. The perfect place to hide someone.”

Garcia immediately tapped into her comms, panic lacing her voice as she patched through to Hotch. "Hotch, I think we’ve found her. She’s at the old library. Marcus has her at the place you all used to study.”

There was a beat of silence before Hotch's voice came through, tight with urgency. "We are on our way."

Aaron Hotchner’s heart pounded as he pushed through the crumbling doors of the abandoned library, his flashlight slicing through the dust-choked darkness. Morgan was right behind him, followed closely by Prentiss, JJ, and Rossi, their footsteps eerily silent against the cracked tile floors. The air was heavy with mustiness, and the faint echoes of their past—years spent studying in this very place—seemed to haunt the hallways. But there was no time for memories. They had to find her.

A distant sound, soft but unmistakable—a faint whimper—cut through the silence. Hotch froze, his breath hitching. His pulse quickened as his eyes darted toward a door partially ajar at the far end of the room. He motioned for the team to fan out as he crept forward, fear and determination twisting in his gut.

He pushed the door open, revealing Y/N—bound, bruised, but alive—lying in the corner of the room. Relief surged through him like a wave, but there was no time to celebrate, she was breathing but not conscious. Morgan moved quickly to her side, cutting her restraints while JJ and Prentiss scanned the area, and Rossi stood guard. Hotch knelt beside her, his voice low but filled with an emotion he rarely let surface. “You’re safe now. I’ve got you.”

Her eyes, though tired and scared, widened when she saw him. Relief washed over her face “Y/N,” he whispered, his voice cracking for the first time in years.

She coughed softly as she tried to smile. “You… you found me.”

“Always,” he whispered, pulling her into his arms. “I’ll always find my wife.”

tagging some of my friends that I know would not mind reading an Aaron fic

@samuel-de-champagne-problems @boldlyvoid @reidsaurora @milla984 @thedancingcostumeyoungadult @reid-ingandweeping @ssahotchnerr

#criminal minds #aaron hotchner x reader #aaron hotchner #aaron hotchner imagine #Aaron hotchner x fem! reader

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