Caden wakes with his arms folded across his chest, fingers digging into his own ribs. A dull ache pulses beneath the skin — persistent, like the ghost of a bruise. He rolls onto his back and hisses as the sheets drag across his nipples, rough against skin that had turned traitor overnight. The pain isn't localized; it radiates outward in concentric circles, tightening with each breath. He presses the heel of his hand against his sternum, testing. The pressure sends a jolt down to his navel.

He skips the morning shower — too much friction — and pulls on a loose cotton tee instead of his usual compression shirt. The fabric whispers against him as he moves, each brush of the seams registering like a faint electric current. At the foot of the bed, his training log lies open to yesterday's entry: 3x15 decline pushups, clean form. He picks up the pen, hesitates, then writes modified range of motion beneath it before snapping the notebook shut.

The cabin's deck is damp with morning dew. Caden sets up his mat under the overhang, avoiding the spots where sunlight will soon bake the wood. He starts with hollow body holds — core engagement first, always — but the moment he arches his back, the ache flares brighter. He adjusts, arms crossed over his chest now, fingers splayed to avoid direct contact. The modification throws off his balance; his hips lift too soon.

Push-ups come next. He drops to his palms, shoulders squared, but the moment his chest nears the ground, the pain spikes — something deep, structural. Like his pectorals are splitting at the seams. He collapses onto his knees, forehead pressed to the mat. A bead of sweat rolls down his collarbone and pools in the hollow of his throat.

By midday, the tenderness has settled into a low throb, present but manageable. Caden works through his keynote revisions at the kitchen table, elbows braced to keep his chest from brushing the edge. The cursor blinks at him, patient and indifferent. He'd gotten as far as avian sexual differentiation before Petra's face flickers behind his eyelids — the way her expression had frozen, then shattered. He minimizes the document and pulls up his training log instead. Scrolled back three weeks to compare metrics. His vertical jump had dropped two inches.

That night, he lies flat on his back, arms at his sides, and catalogs the changes. The pain isn't just surface-level anymore; it has roots. When he presses gently beneath his collarbone, he can feel small, dense knots forming. He rolls onto his side, knees drawn up, and stares at the wall.

The next morning, he catches his reflection in the bathroom mirror while brushing his teeth. His chest is unchanged — no visible swelling, no obvious contours — but when he lifts his arm to spit, the motion pulls at something deep and newly anchored. He prods the spot with his free hand, then freezes. There. A faint but unmistakable firmness beneath the skin.

He rinses his mouth and reaches for his phone. He taps Petra's name. Three rings. Four. He almost hangs up.

"Hey." Her voice is quiet, stripped of the warmth he'd heard over dinner. Just a syllable, but it carries the weight of every unspoken question between them.

He presses the phone harder against his ear. "I need to tell you something." The words come out flat, clinical. Like he is reading from a case study.

He starts with the flannel — how the fabric had felt like sandpaper against his neck that first morning. The shower water scalding his skin. The way his hips had shifted mid-workout, throwing off his deadlift form. He describes the clinic visit in detached detail: Reeves' gloves snapping against his wrists, the disbelief in the doctor's voice when he said fully differentiated.

Petra doesn't interrupt. He can hear her breathing — slow, measured. Like she is counting seconds between inhales.

"It's still happening," he says. His free hand drifts to his chest, fingers skimming the newly dense tissue beneath his shirt. "I don't know where it stops."

A car honks in the background on her end. She must be outside. "Are you okay?"

The question catches him off guard. He opens his mouth, then closes it. The truth is slippery — he isn't in pain, exactly. Just aware of every change in a way that makes his skin feel too tight. "I'm adapting," he says finally.

Petra makes a small noise — not quite a laugh. "Of course you are."

A gust of wind distorts the call for a second. When it clears, she says, "Is it going to keep going?"

He stares at his reflection in the bathroom mirror. His jawline is still sharp, his shoulders broad. But his collarbones look more pronounced now, his neck subtly longer. "I don't know."

A long silence. Then a sigh — heavy, resigned. "I need time to think."

They both know what that means. He grips the edge of the sink, the porcelain cool under his palms. "Okay."

She hangs up without saying goodbye.

Caden sets the phone down carefully, screen-up. The wallpaper is a photo Petra had taken last summer — him knee-deep in a river, mid-laugh, sunlight fracturing across the water behind him. He turns it facedown.

The referral slip crackles as he unfolds it. Dr. Yuen's number stares back at him in Reeves' messy scrawl. He dials before he can rethink it.

The receptionist puts him on hold immediately. Elevator music filters through the speaker — some soulless string rendition of a pop song he almost recognizes. He counts the ceiling beams while he waits.

"Dr. Yuen's office, this is Marisol."

He gives his name, the referral. Marisol hums as she types. "Next available is... October 14th."

A month away. He closes his eyes. "Nothing sooner?"

"Not unless someone cancels." Her nails click against the keyboard. "I can put you on the waitlist?"

"Do that." He rattles off his number, then hesitates. "If — if things progress faster, is there an emergency protocol?"

Marisol pauses. "What kind of progression?"

He crumples up the referral slip. "Secondary sexual characteristics. Rapid onset."

A beat. Then, carefully: "If you experience severe pain, swelling, or bleeding, go to the ER. Otherwise..." Her tone softens. "We'll call if anything opens up."

He thanks her and hangs up. The mirror shows his reflection frowning back — still recognizably his, for now. He touches his throat, imagining the cartilage thinning, his voice breaking.

Three days later, Caden sits at the kitchen table, the laptop screen casting a blue glow across his face. The cursor blinks at the end of his sentence: Whereas avian sexual differentiation occurs primarily via — His fingers hover over the keys. The words won't come. His thighs press together reflexively, the sensation unfamiliar — an extra slickness that hadn't been there before. He shifts in his chair, grimacing as the fabric clings.

Boxers. He is still wearing boxers. Out of habit, mostly. He pushes back from the table and stands, the chair scraping against the floor. The waistband gaps at the front now — there's nothing to fill it out the way there used to be — but the fabric clings at the hips when he pushes them down, catching before it goes. The fabric is damp, darker in patches. Not sweat. Something thicker, translucent, clinging in strings when he pulls the elastic away.

Egg white. That's what it looks like. The comparison comes unbidden, clinical and detached. He knows the texture from cooking — the way it stretches between his fingers when he separates yolks.

His breath hitches.

He presses two fingers to the source, withdrawing them slowly. The fluid stretches in a clear strand, glistening under the overhead light. Ovulation. The word lands with a weight he hadn't expected. He's read the biology, memorized the timelines, but the reality of it — his body preparing for conception while he drafts a speech about gene cascades — lodges something sharp behind his sternum.

Caden reaches for his phone. The camera app opens with a click. He hesitates for half a second before angling the lens downward, capturing the evidence: his thighs, the damp fabric, the translucent strand still connecting his fingers.

The shower runs hot, steam fogging the mirror before he can catch his reflection. He scrubs methodically, shoulders first, then chest, avoiding the new sensitivity there. The soap slips between his legs, and he hisses at the contact.

Dressed in fresh boxers and sweatpants, he returns to the laptop. The sentence still glares at him, unfinished. He closes the document without saving.

The training log lies open on the counter. He flips to a blank page and begins a new entry: Day 14 post-onset. Cervical mucus observed — egg white consistency, stretch >1 inch. Probable ovulation. His handwriting wavers on the last word. He snaps the notebook shut.

Caden dumps the eggs he'd been about to cook down the drain and opens a search bar. How long after ovulation does menstruation occur? The answer glares back at him: 12–16 days.

The cabin's silence presses in, heavier than before.

A week passes since Petra left, marked only by the steady progression of his body's betrayal. The dampness between his thighs has resolved — no more egg-white strands, just a baseline slickness that makes his boxers cling uncomfortably by midday.

Caden drops to the mat for push-ups, palms flat, shoulders squared. His arms tremble halfway through the second set. He exhales sharply as the fabric drags against his chest. The cotton tee rasps over his nipples with each descent, the sensation sharp enough to make his teeth clench. On the third rep, his chest brushes the mat, and something shifts — a faint, unfamiliar weight swaying forward, then settling back as he pushes up.

He pauses on his knees, fingers hovering over the fabric. There. A slight resistance beneath his fingertips where there had been none before. He presses gently, tracing the outline: small but unmistakable, a firmness beneath the skin that hadn't been there yesterday. Breasts, his brain supplies, clinical and detached. He stands, peeling the shirt off in one motion.

The mirror shows him what his hands had already confirmed: two subtle curves where his pectorals had been, the skin smooth and unbroken. Something softer, rounder, than the defined muscle he’s used to. He turns sideways, watching the way the light catches the faint contour. No hiding it now, not without layers. The shirt goes back on, but the weight remains — a persistent presence with every shift of his shoulders.

Caden grabs his phone, angles the lens downward, capturing the evidence: the slight swell beneath his shirt, the way the fabric clings where it hadn't before.

The training log lies open on the counter. He flips to a blank page and begins a new entry: Day 21 post-onset. Breast tissue development observed — small, tender. Performance decline: push-ups -30%. His handwriting wavers on the last word. He snaps the notebook shut.

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