Chapter Text
“I saw you had fun tonight,” Rin started, staring deep into Sae’s half-lidded eyes, drunk from the kiss. He pushed down on his brother’s chest with a disgusted expression. “Fucking whore.”
Sae let out a surprised gasp, grabbing Rin’s wrist and pushing it away. “I’m an adult, it’s none of your business.” He added under his breath — “How lukewarm.”
That really seemed to trigger Rin, who now tried to grab both of Sae’s hands and turn him around, making his face bump straight into one of the lockers. It wasn’t easy though. Sae, despite being shorter, was still strong.
“What the fuck?!” he snarled, trying to free himself from his brother’s grip. But Rin’s mind was already somewhere else. It seemed like nothing could stop him now.
“Who did you hook up with, hmm?” Rin now fully forced himself on Sae, who was facing the lockers, pushing his face into the cold, hard metal. “A boy? Or are you still playing pretend?”
Sae could barely speak with his face shoved into the locker. “It was just a kiss, you idiot,” he mumbled, squirming under Rin’s embrace. He didn’t remember his little brother being this fucking strong. Or this fucking aggressive.
Rin slammed his head even deeper, causing Sae to yelp. “I see… Nii-chan, am I not enough? I never was, right? I wish I could hate you properly.”
Before his brother could even reply, Rin’s hands were already at Sae’s waistband, tugging it down to reveal his bare skin. At first, Sae tried to resist, struggling against the sudden invasion, but the haze of lust quickly clouded his mind, shutting down his defenses.
“Nii-chan,” Rin murmured, slipping his hands beneath Sae’s shirt and tracing over the older’s chest. His fingers lightly pinched at Sae’s nipples, sending a shiver through him.
Sae whimpered softly, caught off guard and overwhelmed by the unexpected sensations flooding his body.
Rin’s hands moved with deliberate certainty, sliding over Sae’s skin like he was claiming territory long overdue. There was no room for hesitation, no space for doubt—only the sharp, steady pressure of his grip, the way his breath hitched just slightly as he leaned in, lips barely brushing Sae’s jaw in a silent promise of control. Every movement spoke of dominance, but beneath it, something raw and desperate flickered—a need that wasn’t just physical, but something deeper, harder to name.
“Rin…” Sae’s breath hitched, surrendering to the touch. Unfortunately, it felt right. It felt like all he could ever want.
The younger didn’t waste any time, undressing as he let Sae’s head fall on the bench under the lockers. “Ah, sorry, nii-chan…” he blurted out, clearly embarrassed.
In reply, Sae just hissed holding onto his cheek. He looked up at Rin, fidgeting with the hem of his shirt, sweatpants tossed somewhere to the side long ago.
“Have you ever done this before?” Rin asked as he dumped his shirt next to Sae’s bottoms, beginning to slide his own pants off.
Sae blushed at the question, clearly disoriented by the whole situation. “Yeah. Once.”
Rin’s lips twitched into a subtle frown, slightly offended by the reply. His eyes narrowed, stormy and unreadable for a beat too long—but then he exhaled through his nose and let it go. He leaned forward again, closing the small distance between them with that same relentless energy, like he couldn’t bear to be apart for even a second longer.
His hand found Sae’s jaw, firm but not unkind, guiding his face up. Their mouths met again—softer this time, but no less intense.
Rin’s hands found Sae’s ass as he repositioned the older making him stand up, hands pushed against one of the lockers. Sae grabbed his brother’s hand from behind, but it was quickly snapped away and replaced by Rin’s fingers trying to enter his mouth.
The moment Sae had realised what was bound to happen, he opened up immediately, glazing Rin’s fingers with a thick coat of saliva. His little brother’s hands were already teasing Sae’s tip, fingers pressing into his slit.
At that point, thinking became significantly harder for both of them—any coherent thoughts blurred at the edges, dissolving before they could take form. Sae wondered where Rin had learnt how to do all of this. He didn’t seem like the type to even want to have sex in the first place. He also wondered what kind of porn Rin liked.
Did he even watch it at all?
Did he also fantasize about the other, just like Sae had?
The press of Rin’s fingers at his hole ripped him out of the monologue.
“Do you even know what you’re doing?” Sae tried to look behind, wanting to see Rin’s expression, but the constant stimulation got him unable to move.
Rin shot the back of his head a glare, eyes sharp. “Let’s find out” he panted, thrusting a finger inside of Sae.
How considerate of him. Sae wasn’t prepped at all— he let out a low moan followed with a groan, trying to grip any part of the lockers he was pressed into.
Soon enough, one finger became two, scissoring Sae’s insides. Rin’s fingers almost instantly found his big brother’s sweet spot— indicated by the whimpers and pitched moans he was letting out. Rin removed his digits from Sae’s hole which was followed by a whine.
The younger let out a small chuckle, “One second, nii-chan.”
Rin took his length into his palm, wrapping all his fingers around it before teasing Sae’s entrance.
“You want this too, right?”
Sae didn’t answer. He couldn’t. His brain completely short-circuited.
“Wait, not like this…” Rin picked up his brother, surprisingly very gently, and placed him back facing the wall. “I want to see your face.” He admitted, immediately followed up by Sae trying to cover it with his shaky hand.
Rin pressed his cock against Sae once again, and this time he entered with a sigh.
He picked up a steady pace making Sae moan and gasp every thrust. They didn’t care about being quiet— nobody was even around by this time of the day.
Sae’s legs locked around Rin— almost instinctively, earning a satisfied smile from Rin’s previously focused expression. The older reached to throw his ar,s around Rin’s neck, causing him to speed up.
“A-ah…! Nii-chan…I love you so much, you know?”
Sae didn’t know. Up until now, at least.
Their position shifted, Rin being sat on the cold tiles, Sae propped up on his knees, making them look almost equal in height.
Sae leaned in for a kiss, lips moving with a kind of desperation he couldn’t name, like he was trying to speak a language only Rin could understand.
“I love you too…Rin. Let’s work this out.” He exclaimed between whimpers, burying his brothers length deep inside of him.
Rin was the first to cum— none of them caring about pulling out, Sae immediately felt the warmth inside of him.
The younger quickly wrapped his hand around Sae’s length, stroking harshly but sloppily. “Nii-chan…nii-cha-an…” he kept repeating his brother’s nickname as he thrusted into his orgasm.
Soon enough, Sae came with a loud moan, burying his face into Rin’s neck, small tears spilling out of his eyes.
They stayed like that for a while—silent, the only sound their heavy breathing tearing through the thick air between them.
Eventually, Sae shifted away, lowering himself to the floor with a quiet exhale.
“Let’s get out of here,” he muttered.
Rin finally moved, muscles aching, but not as much as his chest did. He stood and turned to Sae, who still sat slouched against the lockers, eyes half-lidded in exhaustion.
“Come on,” Rin muttered, offering a hand. “You look like you’re about to pass out.”
Sae blinked up at him slowly, then grumbled, “I am about to pass out.”
Still, he took Rin’s hand, letting himself be pulled up. His legs wobbled slightly, and Rin instinctively caught him by the waist, steadying him without a word. There was something strangely domestic in the way Rin supported him, quiet but firm.
“I’m showering,” Rin said flatly. “You can come too.”
Sae scoffed, but it was weak. “How generous of you.”
Rin rolled his eyes and walked toward the showers, expecting Sae to follow. And of course, despite the grumbling and limp steps, Sae did.
The water was warm, humming softly as it hit the tiles. Rin stood under one stream, eyes half-closed, rinsing the sweat and shame off his skin. A few feet away, Sae leaned against the wall under another stream, hair flattened against his forehead, arms crossed loosely over his chest.
For a while, neither spoke.
The silence wasn’t uncomfortable, but it wasn’t peaceful either—it hung heavy, like the air before a storm.
“…So,” Sae started, voice low and rough from exhaustion, “What was that?”
Rin didn’t look at him. He rubbed at his arms, as if trying to scrub the question away. “We did it...”
Sae exhaled sharply, as if he wasn’t expecting Rin to call him out so plainly. “Yeah,” he admitted. “We did.”
More silence. Only the sound of water running and the occasional squeak of a shifting foot on the tile.
“Why?” Rin asked.
Sae paused, like the answer physically hurt to say. “I don’t know.” He shifted under the stream of water, glancing at Rin from the corner of his eye. “I just… wanted to.”
“Me too. But hey…that’s not an answer,” Rin muttered, finally looking at him.
“I know it’s not,” Sae snapped, but there was no fire behind it. Just a raw edge of confusion. “I’m trying to figure it out, too.”
They stood there, water washing over them, hearts beating somewhere between panic and something softer.
“…Do you regret it?” Rin asked after a long pause. His voice was quieter this time, almost like he didn’t want to hear the answer.
Sae looked at him for a long moment.
“…No,” he said finally. “Do you?”
Rin hesitated. Then slowly, he shook his head.
“No.”
And for the first time since stepping into the shower, they both let themselves relax.
The locker room was cold, a stark contrast to the heat of the shower they’d just stepped out of. Sae sat on the bench with a towel around his shoulders, clearly drained. His hair dripped down his temples, damp lashes clinging together, and his muscles twitched slightly like his body wasn’t quite ready to cooperate.
Rin stood across from him, fully dressed, holding Sae’s crumpled clothes in one arm.
“…You’re useless right now,” Rin muttered, kneeling down and gently tugging a clean pair of sweats up Sae’s legs.
Sae huffed a laugh, but it came out breathy and weak. “I wonder whose fault that is.”
“You didn’t exactly stop me,” Rin fired back, avoiding Sae’s eyes as he helped guide his arms into a hoodie. His movements were clumsy, unpracticed, but careful in a way that betrayed how much he really cared.
Once he’d slipped socks onto his brother’s feet and shoved everything else into a gym bag, he crouched down in front of him.
“Come on.” He looked over his shoulder. “Get on.”
Sae blinked. “What?”
Rin sighed, impatient. “You’re half-dead. I’m not letting you drag your busted ass across campus like that. Get on.”
Sae gave him a long look—equal parts stubborn and stunned—but slowly, without another word, wrapped his arms around Rin’s shoulders. Rin adjusted his grip under Sae’s thighs and hoisted him up with a grunt, standing to full height.
“…You’re heavier than you look,” he muttered.
“You’re stronger than I thought,” Sae murmured against his ear, voice tired but unusually amused.
Neither of them said anything else as Rin carried him out into the quiet, early morning air. The halls were dark, silent, and for once, peaceful.
And though Rin’s back ached and his arms were already starting to burn, he didn’t complain.
Because something about having Sae clinging to him like this—limp, trusting, finally vulnerable—made all of it feel worth it.