The Vanilla Library

TESTING MACHINE

Adrian hunched over his workbench in the dimly lit basement workshop, the air thick with the hum of machinery and the faint scent of solder. His latest invention — a vibratory device designed to revolutionize female pleasure lay before him, its sleek black frame housing a network of wiry tentacles that could extend and writhe on command. The core mechanism pulsed with a low vibration, powered by a compact battery pack, and a sturdy leather belt ensured the wearer stayed put during the 'test phase.' He'd poured months into perfecting it, dreaming of patents and profits, but now came the real trial run.

His younger brother's tutor, Eliza, was the perfect candidate. She was in her mid-twenties, mousy with glasses that perpetually slipped down her nose, her plain dresses hiding a figure he hadn't bothered to notice. Super shy, always blushing at the slightest compliment, she tutored his sibling twice a week in the family home. When Adrian approached her with an offer—five hundred dollars for an hour of her time, no questions asked—she'd hesitated, her cheeks flaming red, but the greed in her eyes won out. Money troubles, he'd guessed. He didn't find her attractive; she was just convenient, discreet, and desperate enough.

Now, she sat strapped to the reinforced chair in the corner of the room, her wrists bound behind her with soft cuffs to prevent any interference, ankles secured to the legs of the chair. Her skirt was hiked up to her thighs, exposing pale skin that trembled under the cool air. Adrian knelt before her, the device in hand, its tentacles coiled like dormant snakes.

"Just relax," he murmured, his voice clinical, detached. He didn't look her in the eye as he fastened the belt around her waist, the cool leather cinching tight against her hips. It locked the device in place once activated, pressing it flush against her core. Eliza whimpered softly, her lips pressed into a thin line, eyes squeezed shut behind her glasses.

"I-I don't know about this," she whispered, her voice barely audible, body rigid with shyness. Her hands twisted futilely against the restraints, but they held firm.

Adrian ignored the plea, flipping the switch. The device whirred to life with a subtle buzz, the wiry tentacles uncoiling slowly from their base. They were thin, flexible wires coated in a silky silicone, vibrating at varying intensities as they extended. The first pair slithered up her inner thighs, inching along her skin like curious fingers, leaving goosebumps in their wake.

Eliza gasped, her legs jerking instinctively, but the ankle cuffs kept her spread just enough for access. "Oh god... what... what is that?" Her voice cracked, a mix of fear and unwelcome curiosity. The tentacles crawled higher, their vibrations pulsing gently at first, teasing the sensitive flesh near her knees, then calves—no, wait, they started low and deliberate, mapping her legs with precision.

He watched, notebook in hand, jotting notes on the device's responsiveness. But as the tentacles reached mid-thigh, Eliza's breathing hitched. A soft, involuntary moan escaped her lips, her head falling back against the chair. The wires branched out, one pair tracing the crease where thigh met hip, the other delving inward, brushing against the edge of her panties.

"Please... Adrian, it's... it's too much," she whimpered, her face flushed crimson, tears pricking at the corners of her eyes. She squirmed, but the belt pinned her hips down, forcing her to endure the slow invasion. The tentacles didn't rush; they writhed with mechanical patience, their tips buzzing harder now, seeking the heat radiating from her p***y.

Adrian paused his writing, glancing up. Something shifted in him. Her shyness wasn't just embarrassment—it was raw, vulnerable, the way her body betrayed her protests. One tentacle slipped under the fabric of her panties, the wire cool and insistent as it nudged against her folds. Eliza cried out, a high-pitched whine that turned into a moan as the vibration hit her c**t directly.

"Ahh! N-no... I can't..." Her words dissolved into breathless pants, her thighs quivering as more tentacles joined, crawling over her mound, parting her lips to expose her slick entrance. The device was programmed to adapt, sensing moisture and warmth, and it did—intensifying the pulses, one wire circling her c**t while another probed deeper, sliding into her p***y with a wet, vibrating thrust.

She bucked against the restraints, moans spilling freely now, her shyness cracking under the onslaught. "Mmmph... oh f**k, it's... inside me..." Her voice was a broken whisper, glasses fogging up as sweat beaded on her forehead. The belt dug into her waist, holding her steady as the tentacles f****d her rhythmically—one pumping in and out of her cunt, another flicking her swollen c**t, a third wrapping around her thigh to steady the assault.

Adrian's c**k twitched in his pants, unbidden. He hadn't expected this—her loss of control was mesmerizing. The way her whimpers turned to desperate pleas, her body arching despite the ties, p***y clenching visibly around the invading wire. She wasn't pretty in the conventional sense, but in this moment, tied and unraveling, she was intoxicating. Her moans grew louder, ragged, hips grinding futilely against the device as it ramped up, tentacles writhing faster, deeper.

"Adrian... please, make it stop... or... or don't... I don't know... ahhh!" Eliza's head thrashed, a sob mixing with her cries as the first orgasm hit. Her p***y spasmed around the tentacle, juices soaking the wires, making them glide even smoother. She came hard, body convulsing in the chair, whimpers turning to guttural moans that echoed off the basement walls.

He stepped closer, heart pounding, no longer detached. The sight of shy Eliza, reduced to this quivering mess—stirred something primal. As the device continued its merciless stimulation, tentacles now exploring her ass crack, teasing the tight ring there, he reached out, brushing a strand of hair from her damp face.

"You're... incredible," he breathed, his voice husky. Her eyes fluttered open, meeting his, wide with shock and lingering pleasure. The shyness was still there, in the way she bit her lip, but the loss of control had stripped her bare, capturing him completely. The test was far from over, and neither was his fascination.

Eliza's body trembled in the aftermath of her release, the wiry tentacles still humming softly against her skin, slick with her juices. They coiled lazily now, one withdrawing from her ass with a slow drag that made her gasp, another lingering at her p***y entrance, teasing the swollen folds. Her breath came in shallow pants, cheeks burning with a mix of embarrassment and lingering heat, her glasses crooked on her nose.

Adrian's hand cupped her face gently, his thumb brushing away a stray tear from her cheek. Her wide eyes met his, shy and vulnerable, pleading silently for mercy or more, she couldn't tell which. The air between them thickened, charged with her whimpers and the faint buzz of the device.

Something snapped inside him, a surge of raw need that overrode his careful restraint. Without a word, he leaned in, capturing her lips in a deliberate kiss, firm and unyielding. His fingers tightened just enough on her jaw to hold her steady, tasting the salt of her tears and the sweetness of her surrender. He didn't pull away from the device; instead, his free hand reached for the control panel strapped nearby, cranking the dial to max speed. The highest intensity roared to life, the tentacles surging with violent vibrations, plunging back into her p***y and ass in tandem, while thinner wires latched onto her c**t, pinching and shaking it mercilessly.

Eliza's muffled cry vibrated against his mouth, her body arching violently in the chair. The restraints creaked as she bucked, wrists yanking futilely, ankles locked wide. The wires f****d her deeper, stretching her holes with relentless thrusts, slick sounds echoing wetly. Her p***y clenched around the invading thickness, gushing fresh arousal that only fueled the device's frenzy, while the ass probe twisted inside her, buzzing against sensitive nerves.

She came apart under him, shattering in waves of overwhelming pleasure. Her moans poured into the kiss, desperate and broken, hips grinding against the belt as her orgasm ripped through her. Juices squirted around the tentacles, soaking her thighs and the seat, her entire frame convulsing—thighs quaking, belly tightening, breasts heaving under her damp blouse.

Adrian held her face through it all, breaking the kiss just enough to gaze into her eyes. His breath ragged, he watched her shatter, the shy tutor reduced to a moaning, writhing mess, her control utterly lost. Something strong budded inside him—a fierce protectiveness mixed with possessive hunger, stirring deeper than mere arousal. Her whimpers softened to exhausted sobs, body slumping as the aftershocks faded, but his grip on her remained tender, anchoring her in the storm he'd unleashed.

"You're... everything," he murmured against her lips, voice low and rough, the device still thrumming at full power, promising no end to her unraveling.