Work Text:
The first time Megumi ended a relationship over a scent, he didn't even realize he was doing it.
He came back from the date earlier than expected, stepping through the door of the apartment he still technically shared with Gojo—for convenience, for familiarity, for reasons he never examined too closely. The other students thought it was odd, an Omega his age still living with his Alpha guardian instead of seeking independence. Megumi just thought it was practical. Gojo's penthouse was closer to the university, quieter, and always smelled exactly right.
Tonight, the scent hit him the moment he crossed the threshold: warm sandalwood and winter air, the faint sweetness of expensive candy Gojo pretended he didn't eat by the handful. Megumi felt his shoulders drop an inch. The low-grade tension that had been coiling in his chest all evening began to unwind.
"Rough night?" Gojo's voice drifted from the living room. He was sprawled on the couch, long legs draped over the armrest, a blindfold pushed up into his messy white hair. His eyes, brilliant and far too knowing, tracked Megumi as he kicked off his shoes.
"The restaurant was loud," Megumi said flatly. "And he smelled wrong."
"Oh?" Gojo's expression didn't change, but something in the air shifted. A subtle thickening of his scent, pleased and possessive, before it smoothed back into welcoming comfort. "Wrong how?"
Megumi dropped his bag and crossed the room without thinking, settling onto the opposite end of the couch. Close, but not touching. "Acidic. Like cheap cologne trying to cover up something sour." He wrinkled his nose. "I couldn't even finish my food."
Gojo made a sympathetic noise. "That's too bad."
"It's annoying," Megumi muttered, pulling a throw pillow into his lap. He didn't mention that he'd spent the entire date comparing the guy's scent to the one currently wrapping around him like a blanket. Didn't mention that halfway through the appetizer, he'd caught himself thinking: Gojo would have already picked a better restaurant. Gojo would have noticed the noise was bothering me. Gojo's scent doesn't make my stomach turn.
He just pressed his face into the pillow—which, of course, smelled like Gojo too—and let the tension drain away.
Gojo watched him, a slow smile curving his lips.
"You know," he said, light and casual, "you don't have to keep going out with these people."
Megumi didn't answer. He was already half-asleep.
---
The others noticed before Megumi did.
It was Nobara who brought it up first, during a study session in the library that Megumi had skipped. She slammed her textbook shut with enough force to make Yuuji jump.
"It's weird, right?" she demanded. "The way Fushiguro is?"
"Weird how?" Yuuji asked, ever oblivious.
Inumaki looked up from his notes and made a pointed gesture: tapping his nose, then his wrist—the scent glands.
"Yes! Exactly!" Nobara pointed at him triumphantly. "Thank you, Inumaki-senpai."
"Tuna mayo," Inumaki said solemnly.
Panda, who had been napping in the corner, opened one eye. "It's not that surprising. Satoru's been scent-marking him since he was a pup. Megumi probably can't even register it anymore."
"But that's the problem!" Nobara hissed. "You've seen the guys he tries to date. They never last more than a week. And every time I ask him why, he says something insane like 'their scent was too sharp' or 'they didn't hold the door right' or 'they put sugar in their tea the wrong way.'"
"That last one does sound annoying," Yuuji admitted.
"It's not annoying, it's conditioning!" Nobara leaned forward, voice dropping. "Gojo-sensei has completely warped his standards. No one else stands a chance because no one else has been pumping comfort pheromones into his room for a decade."
"Salmon roe," Inumaki said, which roughly translated to exactly what she said.
"Should we do something?" Yuuji asked, looking genuinely concerned now.
Panda yawned. "Like what? Tell the most powerful Alpha in the country to stop spoiling his Omega? Good luck."
"He's not his Omega," Nobara argued. "Technically."
Everyone stared at her.
"Right," she said weakly. "Technically."
---
Megumi's heat was approaching. He could feel it in the way his skin prickled at odd moments, the way sounds seemed louder, the way his own scent was slowly sweetening into something richer. It didn't make him anxious. It never had. Not with Gojo around.
He started nesting two days before.
It was instinctual, a biological imperative he'd long stopped trying to resist. He gathered soft things—blankets, pillows, Gojo's hoodies stolen from the laundry room, an old scarf that still carried traces of winter and Alpha. He arranged them in his room, in the corner alcove that had been his since he was a child, piling and smoothing and rearranging until it felt right.
Gojo left things for him to find. Always had. A new cashmere throw draped over the back of the couch where Megumi would see it. A sweater, worn once and left artfully on the bathroom counter. Megumi gathered them without comment, without question. He didn't even think about it anymore. It was just what Gojo did. What Gojo had always done.
By the time his heat actually hit, the nest was perfect. Soft and warm and saturated with the only scent that had ever made Megumi feel completely safe.
Gojo brought him tea and pressed a cool hand to his feverish forehead.
"Leave it to me," he said, the familiar words making something in Megumi's chest unclench.
Megumi, already hazy with heat, looked up at him with heavy-lidded eyes. "Took you long enough."
Gojo laughed softly, reaching into the nest to brush a strand of dark hair from Megumi's damp cheek. His fingers lingered. His scent deepened, Alpha pheromones flooding the room in a wave of protection-mine-safe-stay.
Megumi's breath caught. His pupils dilated. A small, unconscious sound escaped his throat—not quite a whine, but close. His body swayed toward Gojo's touch like a flower toward the sun.
"Shh," Gojo murmured, and the sound was layered with something deeper. A rumble, low and resonant, starting in his chest and vibrating through the air. An Alpha's purr, meant to soothe. Meant to claim.
Megumi went boneless. His eyes slipped closed. The purr washed over him, sank into his bones, quieted the feverish ache for just a moment.
"Good," Gojo breathed, still rumbling. "So good for me, Megumi."
Megumi didn't answer. He was already drifting, curled in his nest, surrounded by Gojo's scent, Gojo's warmth, Gojo's purr. His body knew what it needed. It always had.
And Gojo had made very, very sure that nothing else would ever satisfy.
---
The conversation came a week later, after Megumi's heat had passed and he was back to his usual prickly self.
They were on the balcony, watching the sun set over Tokyo. Megumi was curled in one of the oversized chairs, still wrapped in the cashmere throw from his nest. Gojo sat across from him, for once not speaking, just watching.
"You do it on purpose," Megumi said suddenly. Not accusatory. Just...observant.
Gojo tilted his head. "Do what?"
"Everything." Megumi's voice was quiet but steady. "The scents. The things you leave for my nest. The way you purr when I'm stressed. You've been doing it since I was a kid."
A long pause. Then Gojo smiled, slow and unrepentant.
"And?"
Megumi stared at him. His heart was beating too fast, but his scent stayed calm. No distress. No fear. Just the steady, familiar sweetness of acceptance.
"And," he said, looking away, "you're an idiot."
Gojo laughed, bright and delighted. But he didn't deny it. Didn't apologize. He just stood, crossed the small space between them, and crouched down in front of Megumi's chair. His hand came up to cup Megumi's jaw, tilting his face back toward him. His thumb pressed lightly over the scent gland at the hinge of Megumi's jaw, and Megumi's breath stuttered.
"You could still leave," Gojo said, voice soft. His eyes were anything but. They burned, impossibly blue, fixed on Megumi like he was the only thing in the world worth seeing. "You could try, anyway."
"Could I?" Megumi asked, and it was genuine. Curious.
"No," Gojo admitted, shameless. "But you could try."
He leaned in, pressing his nose to the curve of Megumi's throat, right over the gland. Megumi felt the rumble before he heard it, a purr starting deep in Gojo's chest, vibrating against his skin. His own body responded before his mind could catch up—a rush of warmth, the instinctive relaxation of muscles, his scent blooming sweet and receptive.
"Mine," Gojo murmured against his skin. "From the first day. Always."
Megumi's hands came up, fisting in the front of Gojo's shirt. Not pushing away. Holding on.
"I know," he whispered.
He did know. Had known for years, probably. Had known every time he rejected another Alpha for not smelling right, not feeling right, not being exactly what Gojo had trained his body to crave. Had known when he built his nests from Gojo's clothes. Had known when no other purr could settle his nerves. Had known when he stopped even trying to date, because what was the point?
No one else was Gojo.
No one else would ever be Gojo.
Gojo pulled back just enough to look at him. His smile was still there, but softer now. Almost reverent.
"Say it," he said. "Let me hear you say it."
Megumi swallowed. His voice came out steady.
"Yours."
The word hung in the air between them, heavy and final. Gojo's purr deepened into something almost feral. He surged forward, catching Megumi's mouth in a kiss that was all possession, all promise, all the years of patience finally claiming their reward. Megumi kissed back without hesitation, without resistance.
Because he was spoiled. He'd been raised on the best scents, the softest nests, the warmest purrs. He'd been conditioned so thoroughly, so completely, that nothing less would ever be enough.
And Gojo had made sure of it.
That night, Megumi rebuilt his nest. Bigger this time, in Gojo's room. In Gojo's bed. Gojo watched from the doorway as Megumi arranged the pillows, the blankets, the hoodies, his movements precise and instinctual. When he was finished, he looked up and met Gojo's eyes.
"Well?" he said, a hint of challenge in his voice. "Are you just going to stand there?"
Gojo's smile widened. He crossed the room and climbed into the nest that Megumi had built for them, pulling his Omega close. Megumi went willingly, tucking his face against Gojo's throat, breathing in the scent that was already written into his bones.
Gojo rumbled, low and steady, and felt Megumi's answering purr—quieter, softer, an Omega's gentle vibration—start up in return. Their scents twined together, familiar and inevitable, until it was impossible to tell where one ended and the other began.
"Perfect," Gojo breathed against Megumi's hair. "Exactly as it should be."
Megumi didn't answer with words. He just pressed closer and let his purr speak for him.
Yours. Always yours.