He gripped Siron’s hips hard, easing the head of his cock into the slackened opening, pushing in slowly as he felt the sticky resistance give way. Thanks to someone having already paved the way, the tight inner flesh parted without trouble—until it met the thickest ridge, which blocked his path.

When he tried to force in that bulge—far thicker than any anal beads Siron had ever taken—the opening clenched hard for an instant, mercilessly squeezing the shaft.

“Ahhk—agh—...hah, hah—uuh—hah!”

Baekgyeong kept his gaze locked on Siron’s reflection in the mirror as he drove the head in, breaking through that suffocating resistance. The sudden stretch forced the delicate inner lining to expand brutally, drawing a cry from Siron’s throat, but he ignored it. Vein-ridged flesh scraped along the mucosa as he burrowed deeper and deeper, leaving only two knuckles’ worth of root outside.

Since becoming an alpha, Baekgyeong had worried every time he saw what his body had become—that sex with Siron might no longer be possible. That Siron wouldn’t be able to take this unnaturally enlarged cock of his.

“Hah...hahaha...fuck—it goes in.”

“Aah—hhuhh—nnngh—hh...”

Siron’s hands had long since slipped from where they’d been spreading himself. At a loss, fumbling over the worn porcelain sink, he finally clutched at the hands gripping his hips to endure the deepening penetration.

Baekgyeong felt as though he were melting inside Siron. More than that—Siron’s sweet energy was pouring into his veins, rewiring every nerve. It was nothing like the drugs he’d once lost himself to; it was an absolute rapture beyond any comparison.

“I can feel your pheromones.”

From behind, Baekgyeong wrapped him up, restraining him as he murmured this new discovery. Siron’s expression twisted, shadowed with desperate light.

Baekgyeong began to move, slow and deliberate. Each thrust drove the head against the bend of his colon, forcing Siron to swallow back his breath in broken gulps, unable even to moan. In that unbearable, masochistic pleasure, Siron was beginning to understand the change overtaking his body. Baekgyeong’s pheromones were scraping over his nerves—it wasn’t just arousal from penetration. Something inside him was functioning differently.

Instinctively, Siron arched his back and drew in a breath. The scent at the tip of his nose blurred his reason. Every time that massive column stretched and battered his insides, waves of pleasure engulfed him, drowning him in bliss.

Every moment was an overwhelming shock. He was only with one man, yet it felt as though hands were everywhere—groping, crushing, sucking, biting. His pheromone-drunk mind amplified every sense. The pleasure was unendurable, ruinous.

He knew exactly what was happening to his body now. Heat cycle—an omega’s rut—had begun.

He reached back, scratching at Baekgyeong’s ass. He didn’t care if his body tore apart; he wanted Baekgyeong to shove every inch in and shake him until his insides were wrecked.

“More—more!”

The shaft rammed in to the hilt, defying the desperate resistance of his inner walls, leaving not a hair’s breadth of space.

Siron couldn’t even make a sound. His tongue trembled, only faint breaths escaping as if his throat were squeezed. Baekgyeong wrapped his arms around Siron’s waist, voice low and ragged.

“Hah...four years. Did you...miss me too?”

No—the sex after four years was nothing like before. The Baekgyeong branded into his body, and the Baekgyeong reborn as an alpha, were so different. Yet the body that had once been tamed by him instinctively submitted again. There was no resisting, no escaping.

Every scrape of that ridged surface over his engorged inner flesh made his ass twitch. Baekgyeong stared at his shifting expressions with fever-bright eyes, plunging in hard.

At some point his body relaxed completely, accepting Baekgyeong without a trace of resistance. His knees gave out, lowering him until he was sprawled flat on the wet tile floor. His whole body burned red like iron over flame; the cool surface beneath him felt like salvation. Each deep thrust that pressed against his battered, swollen insides blew his mind white.

Sensation was breaking him. His body writhed with shuddering spasms, nerves in overdrive. Now that he knew this terrible pleasure, he could never go back. Even the fear that he might become a beast chasing nothing but this was burned to white ash.

Imprint.

At the barren, white edge of consciousness, Siron thought of it. Only imprinting could hide his pheromones, only imprinting could shield him from another’s. He couldn’t recall the exact facts, only a blur of things Isaac had said, but it felt like the only antidote left to save himself.

He reached out, fingers searching blindly over the wet tile. One face filled his mind—only Baekgyeong, right now, right behind him, overwhelming him completely.

Still taking his weightless, accelerating thrusts, Siron whispered:

“...In—...ugh...imprint...me.”

The brutal pounding froze. A hot, damp breath spilled over his back like a beast’s panting, and then the cock withdrew, dragging over his inner walls. In an instant he was flipped over, Baekgyeong climbing on top of him in missionary. His dim, muddied vision—half dark, half light—was entirely eclipsed by him.

“You—hff—do you even know what you’re saying?”

Baekgyeong barked the words between rough breaths, his voice low and unsteady with suppressed instinct.

“I know. That’s why—hah—just do it. Now.”

Siron looked up at him, gaze dazed and cloudy. Baekgyeong’s burning eyes wavered before he let out a sharp breath, face twisting.

“You’re the one who allowed me first.”

Without hesitation, he spread Siron’s legs wide. Pressing the head into that narrow, clenched opening, he gripped the middle of his shaft and began to stroke it slowly up and down over the spot above his prostate.

At last, the soft crown found the folds of the inner ring. Siron flinched, hands clutching his shoulders. Slick with fluid, the folds opened easily, revealing the path inward.

“Hhck—uh—wha...hnn...what are you—”

Once he’d pushed the head fully inside, Baekgyeong slid a hand under his lower back.

“Imprinting.”

He lifted Siron’s body, seating him shallowly on his shaft across his thighs.

Siron was shocked, as if skewered on a stake. He tried to plant his feet on the tiles and rise, but they slipped. Flesh under his ass mashed against Baekgyeong’s thighs as the rigid column inside him pried open the innermost barrier.

The pain of a new path being forced open ripped a beastlike sound from his teeth. With the strong impact, the inner ring pulled tight, taut muscles convulsing hard. There was no pause, no mercy—thrust after thrust drove in, widening him by force. The head bullied its way through the clamped walls, stuffing the narrow space full.

The spasming muscles eventually slackened, and the shaft slammed in to the base. The crown grazed the mouth of his cervix deep inside.

“Ahk! Agh—what—what is—”

Spasms started deep within, locking his limbs stiff. Baekgyeong hauled him up and slammed him back down without hesitation.

“Hhhuuaaaagh!”

The small, lip-like mouth of his cervix crumpled against the thrust, forcing out pale, sticky fluid.

“Dee—eeper—ahh—ahhh—deep—ahhh!”

Each flattening press of the crown against it made his whole body twist. Even when he tried to relax, instinct wouldn’t allow it.

“Can’t—can’t do it—ahhh—ahhh!”

Twisting his hips to pull away only shifted the angle, adding new stimulation—not just scraping himself inside but crushing his prostate from an unfamiliar direction. The alien jolt drew a desperate scream from Siron as his mind went white. At some point he was sitting tight against Baekgyeong’s thighs, rocking himself, stimulating his inner walls and prostate on his own.

Pheromones spilled from both bodies, rousing each other’s senses, erasing reason. Drunk on them, they craved more, feeding each other in an endless loop.

Suddenly Baekgyeong let out a low groan, his body locking rigid. The cock buried deep inside him swelled mercilessly, crushing Siron’s bladder and swollen prostate, forcing his walls wider.

From where the knot pressed flush against his cervix came a rush of warm, viscous fluid. Siron knew this sensation from weathering Lewis’s rut—but not what it truly meant. The hormones released during an alpha’s knotting were stimulating his heat-cycle body to fully open its dormant pheromone glands.

For a moment, all sensation cut out. He couldn’t tell how far he was being stretched or where his consciousness had gone. When he came back, his breath was coming in ragged bursts.

“Slowly.”

Baekgyeong’s firm command came with his lips pressing over Siron’s, guiding him until the panicked breathing began to steady.

Baekgyeong had never experienced a knot like this. Before, it had only been in cold, sterile labs, under the eyes of scientists and machines—just a physiological reaction. Drug-induced feelings that had nothing to do with real pleasure, mechanical and empty.

But now, inside Siron, it was different. Warm flesh gripped him close, fine tremors ran through their joined bodies. And yet—the feeling he’d imagined from imprinting wasn’t there. Dr. Tigri had told him imprinting would mean “becoming one completely, feeling each other’s emotions, unable to live apart”—but that didn’t come.

Is this really imprinting?

He had expected a world-shattering change, but everything was still the same. More than that, he felt the relief of reclaiming Siron, and the bliss of his body, so strong he could die right here without regret.

Siron’s voice wavered between sobbing, pleading, and something close to resignation as he called his name. Baekgyeong didn’t know exactly what this feeling meant—but he only wished this moment could last.

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