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Undercover Heat

Aaron Hotchner x Reader

TW: Regular Criminal Minds violence, mentions of blood, death, and gore, suggestive content at the end (no smut), a bit of foul language, enemies to lovers, Hotch is kind of a meanie.

»»————-　➴　————-««

Sitting in the Los Angeles police station for the third day in a row has the entire team from the B.A.U stretched thin and exhausted. They’ve been dealing with a serial killer who targets couples with large age gaps in upscale, luxury clubs. He’s taken out three couples in the past three weeks. Tension was thick in the air, the exhaustion from long hours spent hunting a brutal unsub weighing on each of them.

Y/N runs a hand over her face in irritation as she leans on Morgan’s shoulder. They’ve been driving themselves crazy trying to figure out who this killer is. They’ve gone to multiple different clubs asking if anyone has seen a man between ages 35-50 who tends to sit at the bar people watching rather than engaging in the night’s festivities. But the regulars and employees said they hadn’t seen anything. Their unsub has been strangling his victims in the luxury clubs before dumping their bodies exactly two miles away in very particular positions. They’ve all been found in public spaces. But so far, they were missing something.

Hotch stood at the front of the room, flipping through the latest crime scene photos as Rossi and Morgan finished pinning the map with the last locations of the attacks. Y/N sat across from Reid, skimming through her notes as she analyzed the patterns. With an IQ of 179, a doctorate in criminology and psychology, two master’s degrees in chemistry and law, and a B.A. in history and human resources, her mind rarely rested. She could also fluently converse in four languages—French, Russian, German, and Spanish—which had come in handy countless times in the field. Despite her vast knowledge and sharp instincts, this case had left her unsettled. Something was off, and they hadn’t cracked it yet.

Rossi broke the silence. “We’ve been over this already. The unsub is hitting clubs that cater to the upper class, targeting couples with large age gaps. But there’s still a piece we’re missing. Why these clubs? Why these victims?”

Morgan crossed his arms and leaned back against the wall. “This guy knows how to pick his victims, that’s for sure. But he’s not choosing randomly—there’s gotta be something more connecting these places.”

Y/N frowned, glancing between the case files and the map. “It’s not just about wealth. These clubs aren’t the most high-profile ones in the city, and they’re spread out across the area.”

Reid tapped his pen against the table. “It’s true. They’re not clustered in one neighborhood, and they don’t have a shared ownership group or any overt connections that we’ve found.”

Emily Prentiss nodded from her spot at the edge of the table, deep in thought. “What about the victims? They’re all couples with significant age differences. That’s part of his ritual, but it doesn’t explain why he’s picking these clubs.”

Y/N was staring at the list of clubs they’d canvassed earlier: Ascend, Bourbon Room, Cielo. She narrowed her eyes, something beginning to click in her mind. “Hold on…”

“What is it?” Hotch asked, noticing her shift in focus.

Y/N sat up straighter, her voice thoughtful. “The clubs… they’re in alphabetical order. Look—Ascend, Bourbon Room, Cielo. He’s not just picking random spots. He’s following a sequence.”

Reid’s eyes lit up in realization. “You’re right. It’s subtle, but it makes sense. This kind of obsessive order suggests a particular form of OCD—a need to control every element of his actions. It’s not about the clubs themselves; it’s about the order they fall into.”

Morgan rubbed the back of his neck, impressed. “Damn. This guy’s not just a killer—he’s a full-on control freak.”

Hotch nodded, his expression serious. “If he’s following an alphabetical pattern, we can anticipate his next move. What’s the next club in line?”

Y/N flipped through the files, pulling out the next likely target. “‘DeVane.’ It’s upscale, fits the profile of where he’s been targeting couples. If he’s keeping to this pattern, that’s where he’ll strike next.”

JJ stepped forward, pointing at the map. “Alright. So we’ve got the next location. Now we just need to draw him out.”

Rossi’s eyes light up with an idea as he looked between Y/N and Hotch, “Well, we know the unsub’s got a thing for couples with big age gaps. Looks like we need a decoy.”

Before anyone could react, Morgan’s gaze landed squarely on Y/N, mischief dancing behind his eyes, “And we’ve got the perfect couple right here.”

Y/N blinked, momentarily stunned. “Wait, hold on, what?”

Emily, catching onto Morgan and Rossi’s plan, chuckled. “He’s right, you know. You and Hotch fit the profile. It’d be perfect.”

Y/N stared, incredulous, before glancing toward Hotch. The man was stone-faced, as usual, but she could feel the tension rise between them. “You want me to pretend to be in a relationship with him?”

Morgan shrugged, his smile widening. “Well, you’re 23, Hotch is… not 23. The age gap fits perfectly.”

Y/N’s eyes narrowed, frustration building. “You’re seriously suggesting that Hotch and I—two people who can barely tolerate each other—pretend to be a couple?”

Hotch didn’t even look up from his files. “We’re professionals. We can set aside our differences for this.”

Y/N let out a short, disbelieving laugh. “Set aside our differences? Hotch, we can’t even get through a team meeting without arguing over strategy. How do you expect us to pull off a believable relationship?”

Prentiss leaned in, smirking. “You two do argue like an old married couple already.”

Y/N threw her a sharp look. “That’s not funny.”

JJ chimed in, trying to defuse the tension. “Look, I know this is uncomfortable, but we need to catch this guy before he kills again. You two are the best option we have.”

Y/N shook her head, frustration bubbling over. “This isn’t just about being uncomfortable. We have to convince the unsub that we’re a legitimate couple—he’s going to notice every detail. And we’re not exactly… compatible.”

Hotch finally spoke up, his tone calm but firm. “We don’t have to like each other to do our jobs, L/N. We just have to be convincing enough to lure the unsub in.”

Y/N stared at him, arms crossed tightly. “Convincing? You and I can barely stand to be in the same room. How do you expect us to sell a romantic relationship?”

Morgan chuckled from the side. “Come on, L/N, you’re one of the smartest people I know. With that IQ and all those degrees, you can figure this out.”

Y/N shot him a glare. “I have a doctorate in criminology and psychology, a master’s in law and chemistry, and a B.A. in history and human resources. None of those degrees cover ‘pretending to like your boss who you can’t stand.’”

Rossi stepped in, his tone more diplomatic. “Look, we wouldn’t ask you to do this if we didn’t think you could handle it. This guy’s escalating, and we need to act fast. You and Hotch are the best team for this.”

Y/N sighed, clearly frustrated but recognizing the urgency. She looked over at Hotch, who met her gaze with that same impassive expression. “Fine,” she muttered. “But for the record, I still think this is a terrible idea.”

Hotch gave a curt nod. “Noted.”

»»————-　➴　————-««

Y/N stood in front of the mirror, eyeing the skimpy red dress that Emily had insisted she wear for this undercover mission. The fabric clung to her figure, accentuating every curve. The slit on the side revealed a generous portion of her thigh, leaving just enough room to conceal her gun but not much else to the imagination. The sweetheart neckline plunged dangerously low, exposing far more cleavage than she was used to. She felt exposed, vulnerable—but Emily had been insistent.

“Trust me,” Emily had said with a wicked grin. “You’ll knock them dead.”

Y/N took a deep breath and adjusted the neckline again, trying to reconcile the professional part of her brain with the woman staring back at her in the mirror. She wasn’t usually the type to use her looks to her advantage, but tonight was different. Tonight, the mission came first.

She stepped out into the hallway where the rest of the team was waiting. The moment she appeared, Morgan’s eyes widened, and he let out an appreciative whistle. “Damn, Y/N, you trying to kill the unsub or us?”

She rolled her eyes but couldn’t suppress a smile. “It’s not that bad.”

Morgan grinned, his gaze trailing over her in a playful, non-threatening way that only a close friend could get away with. “If this guy doesn’t fall for the bait, Lord knows I will,” he sucks his bottom lip between his teeth making Y/N slap his chest.

Emily stepped up beside Morgan, her eyes lighting up with approval. “See? I told you that dress would be perfect. You look like a total bombshell.”

Y/N glanced down at herself, smoothing the fabric over her hips. “Yeah, well, I feel like I’m about to flash someone.”

Emily shrugged, unfazed. “That’s kind of the point.”

Morgan shot her a wink. “You’re gonna break hearts tonight, sweetheart. Just make sure it’s the right one.”

Y/N’s eyes flickered toward Hotch, who had been silent since she entered the room. His gaze was locked on her, but he wasn’t saying anything. His eyes were dark, his expression unreadable, but there was something in the way he looked at her that made her stomach tighten.

He quickly glanced away when she caught him staring, clearing his throat. “We need to focus on the mission.”

“Right.” Y/N nodded, trying to ignore the flutter of nerves in her chest. She wasn’t here to impress anyone—least of all Aaron Hotchner. He was too serious, too controlled. While Y/N on the other hand tends to handle the job by hiding behind a wall of humor and sarcasm, something Hotch hates. They’d never gotten along. This was strictly business.

Still, as they walked out to the car, she couldn’t help but feel Hotch’s presence looming next to her. He hadn’t said a word about the dress, but the way his eyes had lingered on her—particularly on her cleavage—hadn’t gone unnoticed. It was like he was trying not to look, but failing miserably.

By the time they arrived at the club, Y/N’s nerves had settled somewhat. The loud thrum of music pulsed through the walls as they approached the entrance, and she straightened her spine, trying to adopt the confident persona they needed for the night.

“Okay,” she murmured as they stepped through the door. “We need to sell this. So maybe try not looking like a statue,” she grumbles lowly.

Hotch, staying ever stoic, gave a curt nod. “I know.”

But Y/N wasn’t convinced. Hotch’s body language screamed discomfort. His shoulders were rigid, his movements stiff, and he had the expression of someone being dragged to an event they wanted no part of.

She leaned in closer to him, keeping her voice low. “Hotch, you’re going to blow this if you don’t relax. We’re supposed to be a couple.”

“I’m relaxed,” Hotch said, though the tension in his jaw told a different story.

Y/N huffed in frustration. “You look like you’re about to interrogate someone, not go dancing with your girlfriend.”

Hotch shot her a look. “I’m here to catch the unsub, not dance.”

“You’re here to catch the unsub by pretending to be my boyfriend,” Y/N whispered fiercely. “Right now, you’re not doing a very good job of that.”

Hotch’s expression remained impassive, but Y/N could sense the faintest hint of annoyance in his eyes. “What do you suggest?”

“Start by putting your arm around me,” she said through gritted teeth. “Couples don’t walk into clubs two feet apart.”

Hotch hesitated, then slipped his arm around her waist. It was awkward at first, his hand hovering as if he wasn’t sure where to put it. But Y/N pressed into him slightly, encouraging him to pull her closer. After a moment, his grip tightened, and they moved deeper into the crowded club.

They found their way to the dance floor, where couples swayed and ground against each other in the dim, pulsating lights. Y/N turned to Hotch, her eyes scanning the room for any sign of their target. They had to blend in.

“Follow my lead,” she said softly.

Hotch nodded, though the tightness in his posture remained.

Y/N began to move to the music, her body swaying in time with the beat. Hotch tried to follow her movements, but he was stiff, almost robotic. She bit back a sigh and leaned into him, pressing her body against his as she wrapped her arms around his neck.

“We’ve got eyes on us,” she whispered in his ear, her lips brushing against the skin just below. “Black hoodie, sitting alone at the bar. You need to make this believable. Stop acting like I have some incurable disease.”

Hotch’s hands found her hips, his grip firm but hesitant. Y/N could feel the tension radiating off him, but she kept moving, her body fluid and sensual as she ground against him. Their bodies remain close, she spins around pressing her ass against crotch, and for a moment, she felt his breath hitch.

“You’re too stiff,” she murmured, leaning her head back, her lips grazing the shell of his ear. “Relax.”

Hotch’s hands tightened on her hips as he tried to match her rhythm. Slowly, the tension in his shoulders began to ease, and he pulled her closer, his breath now becoming warm against her neck.

“That’s better,” Y/N whispered, her voice low and teasing.

Hotch’s hands moved more confidently now, gripping her hips with a possessive strength that sent a shiver down her spine. Y/N’s heart raced as she tilted her head slightly, brushing her lips against the skin of his neck. She trails kisses up and down his skin, nibbling at the soft spot that connects his shoulder to his neck. She turns back around, running her hands through his raven black hair, tugging on the strands which ends up pulling a small groan from Hotch’s lips. The music and atmosphere of the club seems to have pulled them in much deeper than they thought. It’s getting harder to breathe the closer they stay.

“We’ve got his attention,” she murmured, her lips ghosting along the curve of his jaw. She fights off every urge to leave a mark. “He hasn’t looked away for the past five minutes.”

Without warning, Y/N moves her attention from his neck and kisses him, her lips pressing against his in a way that was both soft and urgent. Hotch froze for a split second, but then his hands gripped her waist, pulling her even closer as he deepened the kiss. He’ll probably scold her for the unprofessional action later, but they need to keep this guys attention if this is going to work.

It was electric, the tension between them igniting in a way neither of them had anticipated. Hotch’s hand moves upward, gripping the back of her head. If her eyes were open, they’d be rolling into the back of her head with the way he’s dominating her. Y/N’s heart pounded in her chest as she kissed him, her fingers curling into the fabric of his shirt. For a moment, it didn’t feel like an act.

When they finally pulled apart, both of them were breathing heavily, their eyes locked. Hotch’s expression was unreadable, but there was a flicker of something in his gaze—something Y/N couldn’t quite place.

“He’s hooked,” Y/N whispered, her voice breathless. “We need to get him somewhere more secluded. Before he hurts someone else.”

Hotch nodded, his grip on her waist still tight as they made their way toward the exit. Once outside, the cool night air hit them, and Y/N quickly scanned the area, her heart still racing from the adrenaline of the moment. She can’t see if the unsub followed them. The only light illuminating the area around them being the moon.

“We need to keep making this look real,” Y/N murmured as they moved toward a shadowed alley. “Just in case he’s still watching.”

Without warning, Hotch spun her around and pinned her against the wall, his body pressing into hers. One of his hands is still tight on her hip, the other one shooting up to her neck, squeezing it slightly to hold her in place. Y/N’s breath catches in her throat as Hotch’s eyes visibly darken.

“Is this believable enough for you?” Hotch whispers, his voice low and rough in her ear.

Y/N swallowed hard, enjoying the tiny amount of pressure on her throat. “Yeah… that’ll do.”

They stood like that for a few moments, their bodies pressed together in the darkness. Hotch plants open mouthed kisses from her cheek all the way down to her neck and across her chest, the neckline allowing him much needed access. Y/N sucks in a shaky breath, still waiting for any sign of the unsub. She could feel the tension between them, the heat radiating off Hotch’s body as he held her against the wall.

Suddenly, movement caught her eye. The unsub stepped out of the shadows, his gaze locked on them. Y/N’s instincts kicked in immediately. She shoved Hotch to the side, spinning around to face the unsub as he lunged at her.

In one swift motion, Y/N ducked under his arm, grabbing his wrist and twisting it behind his back. The unsub let out a grunt of pain as she swept his legs out from under him, sending him crashing to the ground.

Hotch was by her side in an instant, helping to restrain the unsub as they waited for backup to arrive.

When it was all over, Y/N stood there, breathing heavily, her heart still pounding from the adrenaline. She glanced over at Hotch, who was watching her with an unreadable expression.

“You okay?” he asked, his voice soft but steady.

Y/N nodded, brushing a strand of hair out of her face. “Yeah. I’m good.”

Hotch’s gaze lingered on her for a moment longer before he looked away, his expression unreadable once again. “Good work.”

Y/N couldn’t help but smile, despite the tension still thrumming between them. “Thanks. You weren’t so bad yourself.”

As they waited for the team to arrive, Y/N couldn’t shake the feeling that something had shifted between them. The mission might have been over, but the tension between her and Hotch was far from resolved.

»»————-　➴　————-««

Y/N barely made it through the door of her hotel room before she kicked off her heels with a sigh of relief. Her feet ached from the hours spent in the club, and all she wanted was to peel off the red dress that clung to her like a second skin, take a long shower, and crash for the night. The team had successfully apprehended the unsub, and they’d earned a few hours of sleep before their early flight back to Quantico.

As she reached for the zipper at the back of her dress, a commanding knock on her door stopped her mid-motion. She glanced at the clock on the bedside table. It was late, far past the time she expected anyone on the team to come knocking. Confusion settled in her chest as she moved toward the door, wondering if someone had an emergency or a last-minute update about the case.

When she opened the door, the sight that greeted her sent her heart racing.

Hotch stood there, but not like the composed, stoic team leader she was used to seeing. His tie was loosened, the top buttons of his shirt undone, and his usually slicked-back hair had a slightly tousled look, as if he’d been running his hands through it. But it wasn’t just his disheveled appearance that threw her off—it was the way his dark eyes flickered with something raw, something he was barely holding back.

He looked… frazzled, but not in a scared or anxious way. No, this was different. It was the kind of frazzled that spoke of barely-contained desire, the kind that made her feel like she was standing on the edge of a cliff.

Her heart skipped a beat as his eyes swept over her, lingering on the red dress she was still wearing. His gaze darkened, his jaw tightening for a split second before he quickly looked back up at her face. But not quickly enough.

“Hotch?” she asked, her voice uncertain, her brows knitting together in confusion. “What are you doing here? It’s late—”

Before she could finish her sentence, Hotch stepped forward, forcing her to take a step back. He shut the door behind him with a firm push, the click of the lock sending a shiver down her spine. His entire presence was overwhelming, the space between them growing smaller with each passing second.

“Why are you still in that dress?” he asked, his voice low and rough, his gaze once again dipping to the neckline of her dress. It wasn’t a question borne out of curiosity; it was an accusation, a demand.

Y/N blinked, completely thrown off by the intensity in his eyes, the tension radiating off him in waves. “I—I just got back. I didn’t have time to—”

But before she could explain further, Hotch took another step forward, backing her up against the wall. His hands were braced on either side of her head, caging her in. The heat of his body was intoxicating, the scent of his cologne filling her senses.

“Tell me,” he said, his voice a low growl, “what the hell were you thinking?”

Y/N’s heart was racing now, her breath hitching as she stared up at him. His face was inches from hers, his breath warm against her skin. “What are you talking about?”

“The kiss,” he said, his eyes narrowing. “The way you touched me. What were you trying to do?”

Y/N’s lips parted in shock, her mind spinning. This wasn’t an interrogation—not really. This was something else, something charged with an energy she couldn’t ignore.

“I was trying to sell the cover,” she replied, her voice faltering slightly, though she stood her ground. “We had to be convincing.”

Hotch’s eyes flashed with something dangerous. “Convincing? You were doing a hell of a lot more than that.”

Y/N’s breath caught in her throat as his words hung between them, thick with implication. The way he was looking at her, the way his body pressed so close to hers, sent heat pooling in her stomach. She could feel the tension crackling between them, making it harder to breathe, harder to think.

“What are you trying to say?” she asked, her voice quieter now, her heart pounding in her chest.

Hotch’s gaze bore into hers, his voice dangerously soft. “You know exactly what I’m saying.”

Y/N clenched her fists at her sides, trying to regain control of the situation, of herself. But the way Hotch was staring at her, the way his body was crowding her against the wall, made it nearly impossible to think straight.

“I didn’t do anything wrong,” she said, trying to keep her voice steady.

“You didn’t do anything wrong?” Hotch’s voice was thick with disbelief, and he leaned in even closer, his lips hovering near her ear. “You kissed your superior, L/N. You pushed yourself against me like a dirty whore. You knew exactly what you were doing.”

Y/N felt her pulse quicken, her skin tingling where his breath brushed against her ear. She wasn’t sure if she wanted to push him away or pull him closer. The heat between them was suffocating, and her body reacted in ways she couldn’t control.

“You kissed me back,” she shot back, trying to hold on to some semblance of control, even as her voice wavered.

Hotch’s hand slid down the wall, his fingers brushing against her arm, sending a shockwave of electricity through her. His lips were so close to her neck now, she could feel the warmth of them, but he didn’t touch her—at least, not yet.

“You want to talk about what I did?” His voice was a husky whisper. “Or do you want to talk about why you did it in the first place?”

Y/N’s breath hitched, her heart racing. “What are you trying to get at, Hotch?”

“I’m trying to figure out what was going through your mind,” he said, his eyes dark with intensity. “You could’ve made it believable without kissing me like that. But you didn’t.”

Y/N’s skin flushed, and she fought to stay composed. “I did what I had to do to keep the cover intact. That’s it.”

Hotch’s lips twisted into a smirk that sent a ripple of heat through her. “Is that what you’re telling yourself?”

Her pulse was in her throat now, and she couldn’t ignore the way her body responded to his nearness, the way her mind spun every time his breath ghosted over her skin.

“You’re trying to act like you don’t care,” Hotch murmured, his voice low, predatory. “But you can’t stand it, can you? You’re as affected by this as I am.”

Y/N’s chest tightened, and she pressed her palms flat against the wall behind her, trying to ground herself. “I don’t know what you’re talking about.”

“You may be able to lie to yourself,” Hotch said softly, his hand brushing over her side, sending a shockwave of heat through her. “But you can’t lie to me.”

Y/N’s heart was pounding in her chest, her breathing uneven as the tension between them became unbearable. Every inch of her body was attuned to his, and the more they fought, the stronger the pull between them became.

“Maybe it’s you who can’t handle it,” Y/N shot back, her voice shaky, but defiant. “Maybe you’re the only one who’s affected.”

Hotch’s eyes darkened even further, and without warning, his lips crashed against hers, all of the tension, all of the pent-up frustration between them exploding in that moment.

Y/N gasped into the kiss, her body melting into his as his hands gripped her waist, pulling her flush against him. A certain wetness pools between her legs as his thigh spreads her legs apart. She grounds herself against him as the kiss builds. It’s fierce, heated, and Y/N can’t stop herself, her hands tangling in his hair as she kissed him back with equal fervor.

It was overwhelming—the way his body pressed into hers, the way his lips moved against hers, demanding more. She could feel the heat between them building, igniting something deep within her that she couldn’t suppress.

For a moment, everything else faded away. The mission, the team, the rules—they all disappeared, leaving only the fire that burned between them.

When they finally broke apart, both of them were breathing heavily, their foreheads resting against each other as they tried to regain control.

“This is a bad idea,” Y/N whispered, her voice breathless.

Hotch’s hand slid up her arm, his fingers brushing against her neck. “I know.”

But neither of them made a move to stop.