Mati felt the world contract into a wet, rhythmic squeeze as the stomach walls pulsed against his ribs. The air was thick, smelling of salt and gastric acid, and every shift of Werka’s body felt like a tectonic plate sliding beneath him.

 

"Stop laughing, Werka! It's not funny when you're trying to dissolve me!" he shouted, his voice sounding thin and distant even to his own ears.

 

A booming, melodic laugh reverberated through the fleshy vault, shaking Mati's entire frame. "But you're so cute in there, Mati! Tell me more about the muscles! Is it like a sponge?"

 

He reached out and pressed his palm against the deep red membrane. It was soft yet incredibly firm, humming with the vibration of her vocal cords. "It's not a sponge, it's a muscle! It's contracting in waves! Now let me out before the acid eats through my pants!"

 

The interior of the stomach suddenly shifted. Werka had sat down, and the sudden change in gravity sent Mati sliding across the slick floor, crashing into a fold of pink tissue.

 

"I think I'll keep you in there for a little while longer," she murmured, her voice a low, sultry rumble that vibrated through the walls and straight into Mati's chest. "I can feel you moving, and it's the most wonderful sensation I've ever had."

 

Mati groaned, feeling the oppressive heat of her core. "This is not biology, Werka! This is kidnapping via ingestion!"

 

"It's a field trip!" she countered, and he could hear the grin in her voice. "Now, be a good little textbook and tell me: does it feel warm? Does it feel like you're being hugged by my very soul?"

 

The irony of his situation hit him; he was a thirty-one-year-old man with a soft belly and no muscle, currently being used as a living anatomy project by his eighteen-year-old sister. The absurdity of it began to melt into a strange, suffocating intimacy.

 

"Yes, it's warm," he admitted, his voice dropping to a whisper as he felt the walls tighten around him in a slow, deliberate contraction. "It's... incredibly warm."

 

Suddenly, the world tilted violently. He felt a massive surge of pressure, a sudden upward rush of fluid and air, and then a blinding flash of daylight.

 

Werka had coughed him up. Mati landed with a wet thud on the polished hardwood floor, drenched in glistening, clear slime that smelled of mint and stomach acid.

 

He lay on his back, gasping for air, his black clothes clinging to his soft curves. Above him, Werka loomed like a benevolent goddess in her pink dress, her blue eyes wide with fascination.

 

"You look so small and pathetic when you're wet," she giggled, reaching down to poke his rounded stomach with a slender finger.

 

Mati glared up at her, though his heart was racing. "You are a menace to science, Werka."

 

"But you loved it," she whispered, her expression turning hungry again. She didn't pull her hand away; instead, she began to stroke his chest, her touch electric against his chilled skin.

 

The tension in the room shifted. The sibling bond was there, but so was a heavy, suffocating layer of desire that had been simmering beneath the surface of their strange dynamic.

 

"I can still taste you," Werka breathed, her voice dropping an octave as she leaned closer, her bust nearly touching his face. "I can still feel you sliding down my throat."

 

Mati didn't pull away. He reached up, his small hands gripping the fabric of her pink dress, pulling her down toward him. "You're insane," he whispered.

 

"Insane for you," she replied, and then her lips crashed onto his.

 

The kiss was hungry and wet, tasting of the very fluids that had just coated him. Werka groaned into his mouth, her tongue sweeping across his, claiming him with a possessive intensity.

 

She gripped his small frame, lifting him effortlessly and pressing him against the warmth of her thigh. Her hands wandered, finding the softness of his belly and squeezing with a firm, demanding pressure.

 

"I want more than just a lesson in biology," she gasped, breaking the kiss to nip at his jawline. "I want to feel every single inch of you."

 

Mati let out a shaky breath, his desire overriding his caution. "Then take it, Werka. Take everything."

 

Werka didn't hesitate. She scooped him up, her fingers digging into the soft flesh of his thighs, and hiked her pink skirts up to her waist. She guided him toward the damp heat of her crotch, pressing his small, trembling body against the soaking fabric of her panties. Mati gasped as he felt the towering wall of her vulva press against his chest, the scent of her arousal thick and muskier than the stomach acid that still clung to his skin. With a predatory giggle, she shifted him, positioning his mouth directly against the drenched silk. "Taste me, Mati. Taste how much you've worked me up," she commanded, grinding her pelvis against him, crushing his small frame into the wetness of her core.

 

He obeyed, his tongue flickering against the fabric, tasting the salty, sweet nectar of her excitement. Werka let out a sharp, jagged moan and slid her hand down to grip him, her thumb and forefinger encircling his tiny shaft. She squeezed with a precision that made his vision blur, pumping him with a rhythmic intensity that drove him toward a peak he couldn't possibly sustain. "So small, yet so hard for me," she whispered, her voice vibrating through him. She suddenly shifted her grip, sliding him upward, using the lubrication of her own arousal to guide him toward her opening. Mati felt the massive, pulsing ring of her clitoris brush against his forehead before he was plunged headfirst into the tight, wet channel of her vagina. The world became a crushing, velvet vise of heat and friction. He was completely engulfed, his entire body swallowed by the rhythmic pulsing of her walls. Werka arched her back, her hips snapping forward in a frantic, grinding motion that hammered him deep into her cervix. She screamed, a loud, echoing release that shook the very room, her internal muscles clamping down on him in a series of violent, milking spasms that forced a white-hot explosion from his body.

 

As the tremors subsided, Werka didn't let go. She kept him pinned deep inside her, her breath coming in ragged gasps. Slowly, she began to withdraw him, the suction of her walls creating a wet, popping sound as he slid back out into the air. She looked down at him, her blue eyes glazed with a mixture of love and hunger, and then she looked toward the hallway.

 

"Paula!" Werka shouted, her voice suddenly bright and cheerful. "Come see! Mati is finally a student of the *real* anatomy!"

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September 26