Cover of The Sins of the Brother

The Sins of the Brother

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Aaron Bennett is a man ruled by logic. At twenty-eight, the sharp, analytical social worker has built a stable life with his husband, Dakota Bennett—a warm, funny, and fiercely devoted detective who would do anything to protect the people he loves. Then Dakota’s younger brother comes back to town. Zack Bennett is everything Aaron shouldn’t want—red-haired, guarded, and quietly magnetic. A mechanic with grease on his hands and secrets in his eyes, Zack unsettles Aaron in ways he can’t explain and shouldn’t explore. What starts as stolen glances and tense conversations turns into something far more dangerous. As Dakota’s latest case tightens around the family and buried truths begin to surface, Aaron finds himself trapped between loyalty and longing. Because falling for the wrong brother isn’t just betrayal— It’s a line that, once crossed, can never be undone

Chapter 2: The Breaking Point

The roasted chicken sat between them like a centerpiece of normalcy, skin golden and glistening under the pendant lights. Dakota carved with careful, practiced strokes, his smile easy as he passed plates around. “Mom’s recipe. Don’t tell her I used tarragon instead of thyme.”

Aaron accepted his plate. “Your secret’s safe.” His voice sounded right in his own ears. Calm. Warm. A perfect imitation.

Zack, from the other side of the wide table, snagged a drumstick with his fingers. “Thyme’s overrated.” He bit into the meat, not breaking eye contact with Aaron. Grease shone on his lips.

“Use a fork, you animal,” Dakota laughed, tossing a napkin at his brother. It landed on Zack’s forearm. He ignored it.

“Some things taste better with your hands,” Zack said, chewing slowly. His gaze flickered down to Aaron’s mouth for a fraction of a second. “More direct.”

The kitchen, usually a space of comfort, felt like a stage. The scent of the chicken was undercut by the sharp, clean smell of the wrench and socket set piled by the sink—Zack’s tools from fixing Dakota’s garbage disposal earlier. They were foreign objects on the polished quartz, a reminder of Zack’s invasive, practical presence.

Dakota filled the silence with stories from his caseload, funny anecdotes about bureaucratic incompetence that made him shake his head with affection. “And then the guy says, ‘But the form didn’t ask if the stolen car was inside the aquarium!’” He grinned, reaching for Aaron’s hand across the table, squeezing it. “You had to be there.”

Aaron squeezed back. He was there. He was also a million miles away, hyper-aware of Zack’s stillness. Zack wasn’t listening. He was watching Dakota hold Aaron’s hand, his expression unreadable.

The conversation lurched to family. Their mother’s tile project. An aunt’s upcoming surgery.

“You still at that garage on 10th, Zack?” Dakota asked, serving himself more green beans.

“For now.”

“He’s got hands of gold,” Dakota said to Aaron, as if selling his brother’s virtues. “Could rebuild an engine blindfolded. Wasted in that shitbox shop.”

Zack shrugged, swirling his water in his glass. “It’s a paycheck.”

“You could do more.” Dakota’s tone was gentle, encouraging. The big brother. The protector.

“Not everyone wants your life, Kota,” Zack said, the nickname a soft, almost tender dart. His eyes found Aaron’s again. “The house, the husband, the… order of it all.”

The air tightened. Dakota missed it, reaching for the wine bottle. “More order is what you need. Your place looked like a bomb hit it last time I was there.”

“It’s called character.”

“It’s called a fire hazard.”

They bickered lightly, a familiar dance. Aaron sipped his water. He felt like a specimen under glass, observed by Zack even as Zack argued with his brother. Every glance was a violation. Every silence between the brothers felt charged with Aaron’s own unspoken thoughts.

After dessert—a store-bought pie Dakota presented with pride—Dakota’s phone rang. He glanced at the screen, frowned. “Damn. Work. Gotta take this.” He stood, pressing a kiss to Aaron’s temple. “Two minutes.”

He walked into the living room, his voice lowering into professional cadence.

The silence in the kitchen was instantaneous and absolute. The hum of the refrigerator grew loud. Zack leaned back in his chair, the legs creaking. He didn’t look at Aaron. He studied the tools by the sink.

Aaron stood, began collecting plates. Busy hands. A logical task.

“He really loves you, you know.”

Zack’s voice was quiet, devoid of its earlier taunting.

Aaron kept stacking plates. “I know.”

“He’d do anything for you.”

“I know that, too.”

“Makes it worse, doesn’t it?”

Aaron froze, a plate in his hand. He didn’t turn around. “Makes what worse?”

He heard Zack’s chair scrape back. Footsteps approached, slow and deliberate. Aaron’s spine tightened. Zack stopped behind him, close enough that Aaron could feel the heat radiating from his body, could smell the faint scent of motor oil and the spiciness of his soap.

“The wanting,” Zack breathed, the word a hot whisper against the shell of Aaron’s ear.

Aaron closed his eyes. The plate trembled in his grip.

“You don’t know what I want.”

“I saw your face in the cafe. You were thinking about how my fingers would feel on you.” Zack’s voice was a low, filthy current. “You were wondering if I’d be rough. If I’d pin you down and make you say his name while I fucked you stupid.”

Aaron’s breath hitched. The crude words were a physical slap, and a shock of pure, molten heat flooded his gut. He was hard instantly, painfully so. Shame and desire twisted into one unbearable coil.

“Stop it,” he whispered, but it was airless, a plea with no force.

Zack’s hand came up, not touching him, just hovering near his hip. “You’re shaking.”

From the living room, Dakota’s laugh floated in, warm and unaware.

The sound broke something. Aaron turned abruptly, needing space, needing to flee. The movement brought him chest-to-chest with Zack, who didn’t yield an inch. Aaron’s back bumped into the counter’s edge. Trapped.

Zack’s eyes were dark, pupils blown wide. All pretense of playful teasing was gone, stripped away to reveal something hungry and dangerous. “You followed me to that cafe,” he stated.

“You asked.”

“You could have said no.” Zack placed his hands flat on the counter on either side of Aaron, caging him in. “You didn’t.”

“Zack—”

“Tell me to stop.” His breath was warm on Aaron’s lips. He smelled of wine and salt. “Tell me to back the fuck off. To keep my hands to myself. To be a good brother.”

Aaron’s mind screamed the words. His mouth wouldn’t form them. He stared at Zack’s mouth, at the sharp bow of his upper lip. He remembered the greasy sheen from the chicken. His own lips parted.

It was all the permission Zack needed.

He closed the distance, crushing his mouth against Aaron’s. It wasn’t a kiss of exploration or tenderness. It was a claiming. Hard, demanding, all teeth and wet, desperate pressure. Aaron gasped into it, and Zack’s tongue swept into his mouth, hot and invasive. The taste of him was dark and addictive.

A moan, low and involuntary, escaped Aaron’s throat. His hands, which had come up to push against Zack’s chest, curled instead into the fabric of his t-shirt, pulling him closer. The rational world—the clink of dishes, the murmur of Dakota’s voice, the life they had built—shattered into a thousand glittering, meaningless pieces.

Zack ground his hips forward, the hard ridge of his erection pressing against Aaron’s own through their jeans. The friction was brutal, exquisite. Aaron’s head tipped back against the upper cabinet with a dull thud.

“Quiet,” Zack growled against his mouth, sucking Aaron’s lower lip between his teeth, biting down just shy of pain. He pulled back, panting. His eyes were wild. “Bedroom. Now.”

“Dakota—” Aaron’s protest was a weak, shattered thing.

“Is on the phone.” Zack grabbed Aaron’s wrist, his mechanic’s grip iron-tight, and pulled him from the kitchen, across the hallway shadowed by the late evening light, into the guest bedroom. He kicked the door shut with his heel. It clicked softly, a sound of profound finality.

The room was spare. Dakota’s gym bag in the corner. A narrow bed with a plain blue coverlet.

Zack pushed him against the closed door, his body a solid, hungry weight. His mouth found Aaron’s again, the kiss deeper, filthier. His hands slid under Aaron’s shirt, calloused palms scraping over his stomach, his ribs. Aaron arched into the touch, a raw sound tearing from his chest. He’d never been touched like this—with such blunt, desperate ownership.

“You’ve been thinking about this,” Zack snarled, yanking Aaron’s shirt over his head. “Since I walked in the door. Since the fucking coffee.” He unbuckled Aaron’s belt with rough, efficient tugs. The button popped. The zipper hissed down.

Aaron’s hands fumbled at Zack’s clothes, driven by a need that obliterated thought. He got the t-shirt off, revealing a torso pale and lean, marked with a few dark tattoos over his ribs. Aaron dragged his nails over them, and Zack shuddered.

They stumbled toward the bed, a tangle of limbs and frantic breath, falling onto the thin mattress. Zack wrestled Aaron’s jeans and briefs down his thighs in one brutal motion. The cool air hit Aaron’s hot skin, followed an instant later by the hotter, harder press of Zack’s hand wrapping around his cock.

“Fuck,” Aaron choked out, his hips bucking off the bed. Zack’s hand was dry, rough, moving with a brutal, knowing rhythm.

“Look at you,” Zack breathed, his own jeans still on, the denim harsh against Aaron’s bare thigh. “You’re fucking dripping for me. For your husband’s brother.” He leaned down, his lips against Aaron’s ear. “You’re a sick, beautiful bastard.”

The words were gasoline on the fire. Aaron reached for Zack’s buckle, his fingers clumsy. “You too. Now.”

Zack stood, a dark silhouette against the dim light from the window. He stripped his jeans and boxers, kicking them aside. His body was all tense, wiry muscle and sharp angles. He was fully hard, his cock curving up against his stomach. He looked down at Aaron sprawled on the bed, wrecked and exposed, and a cruel, satisfied smile touched his lips.

He didn’t speak. He didn’t ask. He moved over Aaron, one knee on either side of his hips, and spat into his own palm. The sound was obscene in the quiet room. He slicked himself, his fist pumping once, twice. Then he leaned forward, the head of his cock nudging against Aaron’s hole.

Aaron’s eyes flew wide. There was no preparation, no gentleness. Just the blunt, burning pressure of the intrusion. He cried out, a sharp, ragged sound, and Zack clamped a hand over his mouth.

“Shut up,” he hissed, his own breath ragged. He pushed in further, an inexorable, stretching burn. It was too much, it was not enough. Aaron thrashed beneath him, pain and overwhelming pleasure splintering his nerves. He was being split open, claimed in the most base, violent way possible.

Zack buried himself to the hilt with a final, grinding thrust, his body shuddering. He removed his hand from Aaron’s mouth, bracing himself on his forearms, his face inches away. Sweat dripped from his temple onto Aaron’s cheek.

“Tell me to stop,” Zack whispered, his voice strained with the effort of holding still. His eyes searched Aaron’s, a challenge and a plea fused into one.

Aaron couldn’t. He was beyond words. He wrapped his legs around Zack’s waist, his heels digging into the taut muscles of Zack’s ass, and pulled him deeper.

A feral sound ripped from Zack’s throat. He began to move.

It was nothing like making love. It was a fuck, pure and simple. Hard, deep, punishing strokes that shook the bedframe against the wall. Each thrust punched a gasped breath from Aaron’s lungs. He clung to Zack’s shoulders, his blunt nails digging in, as the world narrowed to the slick, filthy sound of their joining, the smell of sweat and sex, the brutal rhythm that was destroying him.

Zack fucked him like he was trying to exorcise a demon, or become one. His mouth found Aaron’s again, biting and sucking at his lips, his tongue a ruthless invasion. “Whose is this?” he grunted between thrusts, his hand sliding between them to grip Aaron’s cock, jerking it in time with his own movements.

Aaron couldn’t answer. A low whine was all he could manage.

“Say it,” Zack demanded, his pace turning brutal, driving the air from Aaron’s chest. “Say who you belong to right now.”

The orgasm gathered, a tsunami at the base of Aaron’s spine. He was falling apart, coming undone under the hands and body of the one person who could ruin everything. “Yours,” he sobbed, the betrayal a sharp, delicious edge to his rapture. “Fuck, Zack, yours.”

The words were the trigger. Zack’s rhythm shattered into frantic, uncontrolled lunges. With a guttural shout he buried himself deep, his body locking rigid as he came inside Aaron in hot, pulsing waves. The feeling of it, the utter filthiness, pushed Aaron over the edge. His own climax tore through him, violent and blinding, stripes of white painting his stomach and chest as he convulsed beneath Zack’s weight.

For a long moment, there was only the sound of their ragged breathing and the frantic drum of Aaron’s heart in his ears. Zack collapsed onto him, his weight a sudden, crushing reality. The sweat between their bodies cooled rapidly.

The world rushed back in. The thin blue coverlet scratching Aaron’s back. The distant, muffled sound of Dakota’s voice, still talking on the phone in the living room.

Zack rolled off him, onto his back. They lay side by side, not touching, staring at the blank ceiling. The room smelled of sex and salt and shame.

Aaron’s body hummed with a shattered, exquisite aftershock. His mind was a white, silent static.

From down the hall, a door clicked open. Dakota’s footsteps approached, his voice cheerful, calling out. “Hey, where’d everybody go?”

The footsteps paused outside the guest room door. Aaron’s blood turned to ice in his veins. He saw the doorknob in his peripheral vision. It didn’t turn.

After a heartbeat that lasted an eternity, Dakota’s steps moved away, toward the kitchen. “Zack? Aaron?”

Zack turned his head on the pillow. His expression was unreadable in the gloom, but his eyes were fixed on Aaron’s face, watching, waiting to see what he would do.

Aaron stared back, the silence between them now vast and ruined, the truth of what they had done seeping into the sheets, clinging to their skin, a stain that would never wash out.

Aaron stared back, the silence between them now vast and ruined, the truth of what they had done seeping into the sheets, clinging to their skin, a stain that would never wash out.

Down the hall, cupboard doors clicked open and shut. Dakota was hunting for them.

Zack moved first. He swung his legs off the bed with a fluid, unhesitating grace, as if he’d merely gotten up to use the bathroom. He picked his jeans off the floor, stepping into them without looking at Aaron. The denim whispered over his skin. He zipped, buckled.

“Get dressed.” His voice was low, a sandpaper command. It held no warmth, no regret.

Aaron’s body felt liquefied, useless. The smell of sex—musk, salt, shame—was overwhelming. He pushed himself upright, the motion sending a dull ache through his core. He saw the streaks across his stomach, the physical proof. He fumbled for his briefs, his jeans, his movements clumsy and too loud.

Zack watched him from the doorway, a shadow leaning against the jamb. His gaze was analytical, detached. He nodded toward Aaron’s discarded shirt on the floor.

Aaron pulled it over his head. The fabric felt alien, a costume he had no right to wear.

Footsteps approached again, slower this time. Dakota’s voice, laced with a faint confusion, came from just outside. “You guys in there?”

Zack’s eyes locked on Aaron’s. He held a finger to his own lips. The warning was absolute. Then he turned, opened the door just enough to slide through, and pulled it shut behind him with a soft, final click.

Aaron was alone with the rumpled bed.

“Hey,” he heard Zack say in the hallway, his tone shifting seamlessly into something casual, almost bored. “Just using your can. My sink’s still torn apart.”

“Everything okay?” Dakota asked.

“Fine. Aaron’s just feeling a bit off. Rich food, maybe. He’s lying down for a sec.”

Aaron stood frozen, his ear pressed to the cool wood of the door. He heard Dakota’s concerned murmur, Zack’s dismissive reassurance. Their voices faded toward the kitchen. He was supposed to be lying down. He should lie down.

He couldn’t make himself touch the bed.

Instead, he stood there, trembling, listening to the muffled cadence of normal conversation resume. A laugh from Dakota. The clink of a glass. He looked at his own hands. They were clean. They looked like his hands.

He cracked the door open. The hallway was empty. He could hear them clearly now.

“—just tired, Kota. Long week,” Zack was saying.

“You should take it easy. Let me fix up your place this weekend.”

“I don’t need your help.”

“You never think you do.”

Aaron moved like a ghost. He slipped across the hall into the half-bathroom, closing the door silently. The light was blinding. He avoided his reflection in the mirror, focusing instead on the cold water he splashed on his face. It didn’t help. The scent of Zack was on him, in him. He scrubbed his hands with the cedar-scented soap until they were raw.

When he walked into the kitchen, they both turned. Dakota’s expression was soft with worry. Zack’s was a blank wall.

“You look pale,” Dakota said, crossing to him, his hand coming up to feel Aaron’s forehead. The touch was gentle, proprietary. Aaron flinched.

“I’m okay,” he said, forcing his voice level. “Just… sudden headache.”

Dakota’s thumb stroked his temple. “You want me to run you a bath? We can cancel movie night.”

From the table, Zack took a slow sip of water. His eyes, over the rim of the glass, were unreadable. “Probably just needs some air.”

The suggestion hung there. Dakota nodded. “Maybe you’re right. Babe, want to sit on the patio? It’s cool out.”

Aaron needed to get out of this room, away from the two of them, from the converging lines of their attention. “Yeah. Air would be good.”

The small patio was a concrete square bordered by potted herbs. The night air was cool. It did nothing to clean him. Dakota draped a sweater over his shoulders, kissed his cheek. “I’ll clean up. Take your time.”

He went inside, sliding the glass door shut. Through it, Aaron watched him talk to Zack, saw Zack shrug, collect his toolbox from the sink. Saw Dakota pull him into a brief, back-slapping hug. The sight was a physical sickness.

The door slid open again. Zack stepped out, alone. He didn’t shut it fully, leaving a two-inch gap. A channel for sound.

He stood beside Aaron, not looking at him, lighting a cigarette. The match flared, illuminating the sharp planes of his face for an instant. He exhaled a stream of smoke into the dark. “You pull yourself together?”

The question was brutal in its simplicity.

“What do you want from me?” Aaron’s voice was a frayed wire.

Zack took a long drag. “I wanted that.” He finally turned his head. In the dim light from the house, his expression was carved from stone. “Now I’ve had it.”

“So that’s it?”

“You tell me.” Zack flicked ash. “You gonna run in there and confess to your husband? Unburden your soul?” He imitated a pious tone, mocking. “Dakota, I’m so sorry, I let your brother fuck me raw in the guest room while you were on the phone.”

The ugly words, spoken in Dakota’s space, were a violation upon a violation. Aaron’s fists clenched at his sides.

“Thought not,” Zack said, his voice dropping back to its cool, flat register. “So we’re done. Unless you want to not be done.” He took a final drag, crushed the cigarette under his boot. “Your call.”

He turned to leave.

“It’s not that simple,” Aaron heard himself say, the words ripped from a place deeper than reason.

Zack paused, his hand on the door handle. He didn’t turn around. “It’s exactly that simple. You’re a smart guy. You like things orderly. So put it in a box. A mistake. A one-time fuck.” He glanced back, his profile sharp. “Or don’t. But decide.”

He slid the door open and went inside. Aaron heard his voice, light and easy. “Heading out, Kota. Tell Aaron I hope he feels better.”

The front door opened and shut.

Aaron stood alone in the dark, the weight of Dakota’s sweater on his shoulders. He felt the ghost of Zack inside him, a lingering, brutal fullness. He felt Dakota’s unknowing kindness like a brand.

The patio light flicked on. Dakota stood in the doorway, his big frame filling the space. “Hey. You’re shivering.” He stepped out, wrapping his arms around Aaron from behind, pulling him close, anchoring him. “Let’s get you inside.”

Aaron let himself be led. His body moved on autopilot. In the clean, well-lit kitchen, everything was spotless. The dishes were done. The counter shone. There was no sign of the meal, of the tension, of the wreckage.

“How’s the head?” Dakota asked, his hands rubbing soothing circles on Aaron’s back.

“Better,” Aaron lied. He rested his forehead against Dakota’s chest, inhaling his familiar, safe scent. It was all wrong. He should be comforted. He was desolate.

“Come to bed,” Dakota murmured.

In their bedroom, under the covers, Dakota held him. He traced idle patterns on Aaron’s arm. “Love you,” he whispered into the dark, his breath warm against Aaron’s neck.

Aaron closed his eyes. Behind his lids, all he could see was the ruthless look in Zack’s eyes in the guest room, the possessive set of his mouth. Your call.

“I love you too,” Aaron whispered back, the words ash in his mouth.

Dakota’s breathing evened out into sleep. Aaron lay rigid in his arms. The silence was not peaceful. It was a vacuum, and into that vacuum rushed a single, terrifying truth.

It wasn’t a decision he had to make.

Zack was right. It was a decision he had already made. The moment he hadn’t pushed him away in the kitchen, the moment he’d followed him to that cafe, the moment he’d arched his back and begged for it.

He had already chosen. The stain was not just on the sheets. It was on him. And as he lay there in his husband’s arms, the phantom ache between his legs throbbed like a second, shameful heartbeat, a constant reminder that the box would not close.

The door was open. And he was already on the other side.

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