The iridescent dust settled on the mossy forest floor, and Tae let out a shaky breath.

For twenty-four years, she'd watched from the glades and the treetops, a silent observer of the humans who blundered through her woods. She'd seen their clumsy couplings in moonlit meadows, heard their breathy, urgent sounds.

A deep, aching need had bloomed in her core-a need to understand, to feel what they felt. She was tired of just knowing about sex. She wanted to know it.

With a whispered incantation, older than the oldest oak, she focused all her will. Her tiny, winged form shimmered, light bending and flesh reforming.

It was a torrent of sensation-bones lengthening, skin stretching, a heavy, unfamiliar weight settling on her chest and hips. When the light faded, she stood on two human legs, unsteady.

She looked down at herself and gasped.

Her new body was... insane. Voluptuous curves swelled from a cinched waist.

Full, heavy breasts tipped with deep rose nipples begged for touch. Hips flared, leading to thick, powerful thighs.

And between them... she reached a tentative hand down, her fingers sliding through a slick, hot furl of flesh that made her knees buckle. So wet.

Already. A primal, dripping readiness she'd only ever imagined.

She needed to move, to test this form. Naked and gleaming with fairy magic, she stumbled through the trees until she found a worn path.

And that's where he found her.

"By the gods," a deep, startled voice said.

Tae froze. A man stood ten feet away, not a hunter or a traveler, but a man clutching a leather-bound tome with glowing runes on the cover. He was tall, with messy dark hair and eyes that widened as they raked over her form. His clothes were simple but stained with ink and strange herbs. Kook. The name popped into her head, a whisper from the magic still clinging to her.

"A sylvan manifestation? A corporeal illusion?" he muttered, more to his book than to her. His gaze was analytical, hungry, but not with malice. With a scholar's intense curiosity. "The energy signature is... profoundly fertile."

"I... I want to know," Tae blurted out, her new voice a husky, unsure thing.

"Know what?" Kook took a step closer. His eyes dropped to the glistening patch between her thighs, and his breath hitched. The analytical mask slipped, revealing raw, unvarnished desire.

"About... that," she whispered, her hand drifting back to her own wetness, spreading her lips slightly in invitation. "What it's for. What it feels like."

A slow, dirty smile spread across Kook's face. He let the book fall to the moss. "A practical study. I'm a magi-biologist. I specialize in practical studies."

He closed the distance, his scent-parchment, ozone, and pure man-washing over her.

"Your form... it's a miracle of magical bio-engineering. The curves are a gravitational pull. And this..."

He didn't ask, he simply pressed a broad thumb against her soaked slit, collecting her moisture. "...this is a perfect, self-lubricating ecosystem. Begging for exploration."

Tae moaned, the simple touch sending jolts of pure, white-hot pleasure through her. Her back arched, pushing her breasts against his chest.

"You want to know?" he growled, his voice dropping an octave.

He brought his wet thumb to his mouth, tasting her.

His eyes rolled back for a second. "Fuck. Sweet and electric. Let's start with the basic principle of friction and fit."

In one swift motion, he spun her, pressing her front against the rough bark of a wide tree.

His body covered hers, hot and hard. One hand groped her breast, pinching and rolling the nipple until she cried out.

The other hand delved between her legs from behind, two thick fingers sliding into her dripping channel with obscene ease.

"Oh! Oh, gods!" Tae screamed, her vision spotting. The stretch was immense, glorious.

He fingered her with deep, punishing strokes, his palm grinding against the swollen nub of her clit with every thrust. "Is... is this it?"

"This is the preface," Kook grunted into her ear.

She could feel the rigid length of him, trapped in his trousers, pressing against the cleft of her ass. It felt huge. "The main text is... more substantial."

He withdrew his fingers, shiny with her essence, and fumbled with his trousers. Tae heard the rustle of fabric, then felt the blunt, searing-hot head of his cock press against her soaked entrance. He was thick, veined, and the sheer size of him made her whimper with a mix of fear and desperate need.

"This is the experiment," he breathed.

"The hypothesis is... you can take it. That you were made to take it."

He didn't wait for a verbal answer. He read it in the way she pushed her hips back, in the desperate clench of her inner walls around nothing. With a low, animal groan, he shoved forward.

The stretch was breathtaking, a burning, full-to-bursting sensation that stole the air from her lungs.

He was so deep, filling her completely, a perfect, torturous fit. She felt every inch as he buried himself to the hilt, his hips flush against her ass.

"Fuck! Yes!" Kook roared, his composure shattered.

He held there for a moment, both of them trembling. Then he began to move.

It was a brutal, relentless rhythm. He pulled almost all the way out, letting her feel the shocking emptiness, then slammed back in, the impact jarring her whole body against the tree.

In. Out. In. Out.

Each thrust was a lesson in raw, physical pleasure. The rough bark scraped her nipples, his hands dug into her hips, and that magnificent, thick cock pistoned inside her, hitting a spot deep within that made stars burst behind her eyelids.

"You feel that?" he grunted, his pace increasing. "That's your body accepting the data. All of it."

Tae could only babble, a stream of yeses and pleas and broken fairy words.

The coil in her belly was tightening impossibly fast.

The wet, slapping sounds of their union filled the clearing.

Her magic, her very essence, seemed to spark and flow with every thrust, meeting his own latent magical energy in a feedback loop of sensation.

Her pussy was a molten, clenching vise around him, getting wetter, hotter, tighter.

"I'm gonna make you lose it, fairy," Kook promised, his voice ragged.

"I'm gonna make you forget every goddamn thing but this cock. You're going to break on it."

He hooked an arm around her waist, angling her hips, and the next thrust...

Tae shattered.

A scream was torn from her throat as her climax detonated.

It wasn't a wave; it was a supernova, burning through every nerve ending.

Her inner walls convulsed around his shaft in frantic, milking pulses, her magic erupting in a shower of harmless, sparkling light around them.

She lost all control, her body seizing, her mind going blissfully, perfectly blank.

Kook swore, the tight, fluttering grip of her orgasm pushing him over the edge.

With three more savage thrusts, he buried himself deep and stilled, a guttural roar echoing hers as he emptied himself into her, pulse after hot, claiming  pulse after hot, claiming pulse filling her up.

They slumped against the tree, panting, slick with sweat and shared fluids.

Kook's softening cock slipped from her, followed by a trickle of his release.

Tae's legs gave out, but he caught her, turning her in his arms.

Her wide, dazed eyes met his dark, satisfied ones.

"Chapter one," he murmured, wiping a strand of hair from her face. "The introduction to human pleasure." He glanced down at where they were joined, at the mess they'd made. "The lab work, however... is far from complete. I have... theories about refractory periods in magically-augmented beings."