Cover of The Big O

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21 year old Sophia and 20 year old Harry are best friends who don’t know what sex is. Why they don’t know is not important. But they get horny and curious and they figure out they can have a lot of fun if Harry puts his penis in Sophia’s vagina.

Chapter 6: The Physics of Pleasure

Sophia gasped, the broad wet stroke of Harry’s tongue across her anus sending another unexpected jolt up her spine. It was warm, insistent, strangely grounding amidst the whirlwind of sensation. Beside her, Mrs. Gable trembled, a low moan escaping her lips as Sophia’s own tongue traced slow circles around the older woman’s wrinkled pucker. The taste was musky, intimate, a landscape Sophia was mapping with fascinated curiosity. The camcorder’s red light blinked steadily from its tripod perch, capturing the tangle of limbs and focused faces on the worn carpet.

Harry pulled back slightly, his brow furrowed in intense concentration. Sophia felt the cool air replace the warmth of his mouth against her backside. He wasn’t looking at her, or at Mrs. Gable; his gaze seemed fixed on the spot he’d just been licking, his head tilted like he was examining a complex equation. "Whoa," he breathed, his voice thick with sudden scientific fervor. "It’s… like a little valve, right? Tightens and loosens?"

Sophia paused her own ministrations on Mrs. Gable, lifting her head. "Yeah?" she prompted, unsure where this was going. Mrs. Gable whimpered softly at the loss of contact.

"Yeah!" Harry’s eyes snapped up, wide and bright with discovery. "So… what happens," he leaned closer again, his breath hot against Sophia’s damp skin, "if you blow air into it?" The question hung, blunt and utterly bizarre.

Before Sophia could process the absurdity, before Mrs. Gable could offer a cautionary word or a fascinated encouragement, Harry acted. He pressed his lips firmly against Sophia’s puckered hole, forming a tight seal. Sophia felt the pressure, the intimate warmth of his mouth, and then – a sharp, forceful exhale.

Pfffttt.

The sensation was instantaneous and utterly alien. It wasn't pain. It wasn't exactly pleasure. It was a sudden, deep distension, a ballooning pressure deep inside her rectum, pushing upwards. Sophia’s entire body arched violently off the carpet. A strangled, high-pitched squeal tore from her throat, completely involuntary. "HARRY! FUCK!" Her hands flew back instinctively, trying to push him away, but the sensation was already rippling through her, a bizarre internal vibration that felt both invasive and shockingly intense. Her thighs clamped together involuntarily, trapping Harry’s head momentarily.

Harry jerked back, startled by her reaction, his lips popping free. He stared at her, eyes wide with a mixture of alarm and intense curiosity. "Whoa! Did it work? Did it go in? Did your butt suck it in?" He bounced slightly on his knees. "What did it feel like? Was it like… inflating?"

Sophia gasped for air, her body trembling, the strange internal pressure slowly subsiding into a lingering, deep thrum. She felt flushed, disoriented, her heart pounding against her ribs. "It… it felt…" Words failed her. She looked down at herself, then at Harry’s eager face. "Like… you blew up a balloon inside my guts!" She managed, her voice shaky. "Deep! Really deep! And… weirdly… buzzy?" She squirmed, the residual sensation both unsettling and strangely compelling. "Do it again?"

Mrs. Gable, momentarily forgotten, let out a choked sound. She’d been watching, frozen, her own arousal momentarily eclipsed by sheer astonishment. Now, she pushed herself up onto her elbows, her gaze darting between Sophia’s flushed face and her exposed backside. "Harold!" she rasped, her voice thick with a blend of shock and burgeoning fascination. "That… that was… unexpected." She adjusted her glasses, peering intently. "Report, Sophia! Sensory details! Physiological response!"

Sophia took a shuddering breath, trying to articulate the bizarre feeling. "It… rushed in. Fast. Like… filling up a space I didn’t know was empty? Deep inside my bum. Made my whole belly feel… full? For a second. Then…" She shifted, pressing a hand low on her abdomen. "It kinda… vibrated? Like… bubbles popping way inside?" She looked at Harry, her eyes wide. "Do it! Again! Harder?"

Harry needed no further encouragement. Grinning with the zeal of a mad scientist, he lunged forward, pressing his lips back against her anus with renewed determination. Sophia braced herself, spreading her legs wider, pushing her hips back towards his face. PFFFFTTT! Another sharp, forceful exhale.

This time, Sophia was ready. The initial shock was less, replaced by the intense, peculiar sensation of internal inflation. She gasped, her back arching again, but this time a low moan mingled with the gasp. The pressure built, deep and insistent, pushing against unseen walls inside her. And then, as Harry pulled back, the release wasn't just the air escaping – it triggered something else entirely.

The deep, buzzing vibration radiating from her core seemed to detonate a chain reaction. A sudden, violent spasm clenched her pelvic floor muscles. Her vision blurred momentarily. A guttural cry ripped from her throat, completely unlike her usual sounds. Her hips bucked wildly against nothing as an intense, shuddering wave of pleasure, sharp and unexpected, crashed over her. It wasn't centered on her clit or vagina; it felt like it erupted from the very spot Harry had blown into, radiating outwards in electric pulses. Her fingers dug into the carpet fibers. "OH! GOD! HARRY! THAT! FUCK!" Her body convulsed, trembling uncontrollably for several seconds before collapsing back onto the rug, panting, dazed.

Harry scrambled back, eyes wide as saucers. "Whoa! Sophia! Did you just…?" He pointed vaguely at her trembling form. "Did your butt make you cum?"

Mrs. Gable was already moving. She scrambled closer, ignoring her own nakedness, her gaze fixed intently on Sophia’s flushed face and heaving chest. "Remarkable!" she breathed, her voice trembling with excitement. "A rectal-induced orgasm? Orgasmic reflex triggered by sudden internal pressure?" She leaned over Sophia, her hand hovering near Sophia’s slick sex, not touching, just observing the visible throbbing and wetness. "Document! Harold, the camcorder! Ensure it captures the full clitoral and labial response! The flush! The aftershocks!" Her own breathing was ragged, a dark flush spreading down her neck and chest. A visible trickle of moisture glistened on her inner thigh.

Harry, momentarily distracted by Mrs. Gable’s command, bounced up and adjusted the tripod slightly, peering through the viewfinder. "Got it! She’s all… shiny and twitchy!" He reported.

Sophia lay sprawled, trying to catch her breath, the echoes of the bizarre orgasm still tingling deep within her pelvis. She felt utterly spent, yet wired. "It… it wasn’t like normal," she managed, her voice hoarse. "Deeper. Sharper. Like… getting punched in the guts but… good?" She looked at Harry, a dazed smile touching her lips. "Your mouth… on my butt… made me explode."

Harry beamed, puffing out his chest. "Science!" he declared proudly. He dropped back to his knees beside her, his gaze drifting back to her exposed rear with intense fascination. "So… wanna try it on Mrs. Gable?" He gestured towards the older woman, who was still crouched nearby, observing Sophia’s recovery with rapt attention, her own arousal palpable.

Mrs. Gable’s head snapped up. Her eyes widened behind her smudged glasses. She looked from Harry’s eager face to her own presented backside, then back. A slow, deep flush crept further down her chest. She swallowed visibly. "I…" she started, her voice uncharacteristically hesitant. The raw vulnerability Sophia had witnessed earlier flickered briefly in her eyes, mixed now with a potent cocktail of curiosity and desire. "The… physiological differences… elasticity…" she murmured, almost to herself. Then, decisively, she shifted her weight, turning slightly to present herself more fully to Harry. "Proceed… cautiously, Harold. Document the comparative response."

Harry needed no further invitation. He shuffled closer to Mrs. Gable, his focus absolute. Sophia pushed herself up onto her elbows, fascinated, watching Harry press his lips against the wrinkled, grey-framed pucker. He took a deep breath, his shoulders tensing. Pfffttt. The sound was slightly softer this time.

Mrs. Gable gasped, a sharp intake of breath. Her body stiffened. Her hands clenched into fists on the carpet. "Oh!" she breathed, her voice tight. "Distension! Immediate! Significant!" She paused, trembling slightly. "Deep… visceral pressure." Another moment. Her hips gave a tiny, involuntary jerk. "And… the vibration! Oh! Distinct! Resonant!" Her eyes squeezed shut behind her glasses. "Continue!"

Harry blew again, harder. PFFFFTTT!

Mrs. Gable cried out, a raw, throaty sound. Her back arched fiercely, her head thrown back. "YES! THERE! OH! THE PRESSURE!" Her body convulsed, not with the violent spasms Sophia experienced, but with deep, shuddering tremors that racked her thin frame. Her mouth hung open, gasping. "The… release…!" she managed, her voice cracking. "Not… orgasm… but… profound… sensation! Overwhelming!" She collapsed forward onto her forearms, trembling violently, her breathing ragged. A low, continuous moan vibrated in her chest. "Harold… Sophia… oh…" Her voice trailed off into incoherent murmurs of stunned pleasure.

Sophia watched, mesmerized. The sight of Mrs. Gable, usually so composed and instructive, reduced to trembling, gasping vulnerability by Harry’s bizarre experiment was profoundly intimate. It erased the decades between them. They were just bodies, reacting. Harry sat back on his heels, looking immensely pleased with himself, watching Mrs. Gable recover. The camcorder whirred softly.

Sophia felt a fresh, insistent throb deep inside her own body, echoing the strange fullness Harry’s air had created. But now, it wasn't just about the sensation. It was about the potential. She remembered Mrs. Gable’s earlier instruction: ‘Guide Harold… inside you… there.’ The idea, which had seemed abstract before, now pulsed with visceral possibility. That deep place inside her, the one Harry had just filled with air and triggered an explosion… what would it feel like filled by him? By his rigid, familiar heat?

She reached out, her fingers brushing Harry’s sweaty shoulder. He turned, his expression shifting from scientific triumph to curious attention. Sophia met his gaze, her own eyes wide, dark with renewed need. Her voice, when it came, was low, blunt, cutting through the heavy breathing in the room. She was so excited…and so horny….she simply could not wait. But all the same, they continued licking each other.

But all the same, they continued licking each other. Sophia’s tongue pressed flat against Mrs. Gable’s wrinkled ring, circling slowly, deliberately exploring the intricate texture. Harry’s tongue rasped wetly over Sophia’s tighter pucker, broad strokes followed by tentative flicks against the entrance. The air thickened with shared breath, wet sounds, and the sharp scent of sweat and musk. Mrs. Gable’s hips pushed back weakly against Sophia’s mouth, a low groan rumbling in her chest.

"Oh!" she gasped, the sound sharp and sudden. Her body tensed. "Oh my god…" Sophia felt the tremor run through the older woman’s thighs pressed near her shoulder. "Oh my god that feels so good…" Mrs. Gable’s voice climbed, losing its usual measured tone, becoming raw, almost girlish. "That feels so GOOD! Her cry echoed off the cluttered living room walls, startlingly loud. "OH MY LORD!" Her head thrashed side to side on the worn carpet. "THE PLEASURE YOU’RE GIVING ME FEELS SO FUCKING GOOD!!!!"

Sophia felt a jolt of answering heat deep in her own belly, spurred by Mrs. Gable’s desperate cries and the relentless pressure of Harry’s tongue working her own back door. She doubled down, pressing her face deeper, licking harder, faster, swirling her tongue tip directly against the tight muscle. Mrs. Gable screamed, a high, ragged sound that dissolved into shuddering gasps. Her entire body convulsed, hips lifting off the carpet, spine arching impossibly. "YES! THERE! FUCK! FUCKING YES!" she shrieked, her voice cracking. Her hands scrabbled blindly at the rug, fingers curling into claws. A gush of wetness soaked the carpet beneath her thighs as her body locked rigid for several seconds before collapsing, twitching violently, her cries dissolving into incoherent whimpers.

Simultaneously, Sophia felt her own climax detonate. It wasn't the sharp, deep explosion Harry’s air had triggered earlier. This was a slower, hotter wave cresting from the relentless friction of his tongue combined with the visceral sound of Mrs. Gable’s ecstasy. It surged up from her core, a molten flood that washed away thought. Her own cry tore free, muffled against Mrs. Gable’s skin as her hips bucked wildly against Harry’s face. "HARRY! OH GOD! FUCK!" The orgasm rolled through her in powerful pulses, leaving her trembling, gasping, her vision speckled. Harry moaned against her, his tongue still working frantically through her contractions, prolonging the intense aftershocks.

Panting, sweat-slicked, Sophia lifted her head from Mrs. Gable’s trembling backside. The older woman lay utterly spent, face down, breathing ragged. Harry finally pulled back from Sophia, his chin glistening, eyes wide and dazed. The air crackled, thick with the musk of three bodies pushed to the edge. Sophia’s gaze drifted from Harry’s flushed face, down his lean torso, to his rigid cock bobbing against his thigh. Then it shifted to Mrs. Gable’s prone form, her legs slightly parted, the grey curls between her thighs damp, her sex visibly swollen and glistening under the lamplight. A sudden, fierce impulse seized Sophia, cutting through the post-orgasmic haze – a sharp, visceral image of Harry pushing into that wet, waiting warmth.

"Harry," Sophia breathed, her voice hoarse but urgent. She nudged his shoulder. "Go on." She nodded towards Mrs. Gable. "Put it in her. Just… just for a minute. Her vagina. See how it feels." The idea felt bold, electric. "Lie with her. Just for a minute."

Harry blinked, processing. He looked from Sophia to Mrs. Gable’s exposed sex, then back. A slow, eager grin spread across his face. "Okay!" He scrambled on his knees towards Mrs. Gable’s hips. Mrs. Gable lifted her head slightly, confusion and exhaustion warring in her bleary eyes. "Sophia?" she mumbled weakly.

Harry didn't hesitate. He positioned himself clumsily behind her, his hands gripping her hips. He pressed the blunt head of his cock against her slick entrance. Mrs. Gable gasped, her eyes flying wide open. "Oh! Harold! Wha—?" The question died as Harry pushed forward smoothly, sinking deep into her with a single, firm thrust. Her mouth formed a silent 'O' of shock that instantly morphed into pure, stunned pleasure. "Ohhhhhh," she moaned, long and low, her head dropping back onto the carpet. Her body arched instinctively, pushing back against him. "Oh… oh yes…"

Harry groaned, a deep, resonant sound Sophia hadn't heard before. He began to move, slow at first, then faster, his hips rocking against Mrs. Gable’s backside. "Whoa," he breathed, his eyes fixed on where he disappeared into her. "It’s… softer? Warmer? Different…" He thrust again, harder. Mrs. Gable cried out, her hands reaching back blindly to clutch at his thighs. "Yes! Deeper! Please!" Her voice was thick, desperate. Harry obeyed, his movements gaining a primal rhythm, his breathing harsh. Sophia watched, mesmerized, a strange heat coiling low in her own belly again as she saw Harry’s muscles flex, heard Mrs. Gable’s increasingly frantic moans. "Fuck! Oh fuck! Harold!" Mrs. Gable gasped, her hips meeting his thrusts eagerly. "Don’t stop! Don’t—!"

Sophia’s own need surged back, sharp and insistent. The image of Harry filling her anus, guided by Mrs. Gable’s expertise, burned brighter than the sight before her. "Harry!" Sophia called out, her voice cutting through the wet slap of skin and Mrs. Gable’s cries. "Harry, stop! Remember! Save it! For me! My butt!" She pointed emphatically at her own exposed rear. "We need to do our anal!"

Harry froze mid-thrust, buried deep inside Mrs. Gable. He looked at Sophia, confusion flickering across his flushed face, then dawning comprehension. "Oh! Right! The butt stuff!" He started to pull back slowly.

Mrs. Gable instantly wailed, her body convulsing against his withdrawal. "Oh NO!" she cried, her voice raw with panic and loss. "Please! No no no PLEASE!" She twisted, trying to clamp her legs around him, her hands scrabbling to hold him inside. "OH MY GOD THAT FELT SO GOOD… DON’T GO! PLEASE!" Her eyes were wide, pleading, filled with a desperate hunger Sophia hadn’t anticipated. "Just… just a little longer! Harold, PLEASE!"

Sophia crawled closer, placing a hand firmly on Mrs. Gable’s trembling shoulder. "Mrs. Gable," she said, her voice gentle but firm. "It’s my turn. Remember? You promised to help. Guide him. Into me. Anal." She met the older woman’s frantic gaze. "You helped us start this. Help us finish it."

Mrs. Gable stared at her, panting, tears welling in her eyes again – tears of frustration this time, mingled with the fading echoes of intense pleasure. The raw need warred with her ingrained role as their guide. Slowly, reluctantly, the desperate tension eased from her body. She slumped back onto the carpet, releasing Harry. A shuddering sigh escaped her. "You’re… you’re right, Sophia," she whispered, her voice thick. She turned her head towards Harry, who had pulled completely free, his cock slick and glistening. A weak, grateful smile touched her lips. "Thank you, Harold. That was… unexpectedly magnificent." She patted his knee weakly. "Now. Help Sophia."

Harry nodded, bouncing eagerly towards Sophia. Mrs. Gable pushed herself up onto her elbows, visibly gathering her composure, the teacher reasserting herself despite her flushed skin and trembling limbs. "Position, Sophia," she instructed, her voice regaining some authority, though still breathless. "Hands and knees. Present properly. Harold, kneel behind. Lubrication! Sophia’s wetness is good, but more is better. Use your fingers first, Harold. Generously."

Sophia scrambled onto her hands and knees on the carpet, facing away from Harry and the camera, her heart pounding with anticipation. She pushed her hips back, arching her spine, presenting her anus fully. She felt exposed, vulnerable, utterly focused. Harry knelt behind her, his hands slicking her wetness mixed with his own saliva over her entrance and his rigid length. Mrs. Gable shuffled closer, positioning herself beside Sophia’s hip, her gaze sharp and assessing.

"Slowly, Harold," Mrs. Gable coached, her voice low and intense. "Press the tip against her. Gentle pressure. Sophia, breathe out. Push gently against him. Like you’re trying to… pass something." Sophia obeyed, exhaling deeply, pushing her hips back slightly against the blunt pressure of Harry’s cockhead. It felt strange, insistent. "Good!" Mrs. Gable murmured. "Now, Harold, steady pressure. Don’t force. Let her body open."

Harry pushed forward. Sophia gasped. There was resistance, a tight, burning stretch unlike anything she’d felt before – deeper and more profound than his tongue or the air. But then, surprisingly, it yielded. The head popped past the tight ring. Sophia cried out, a sound of shock and intense sensation. "Oh! FUCK!"

"It’s in!" Harry announced, awed. He pushed forward another inch. Sophia felt herself stretching impossibly wide, filled in a way that resonated deep into her pelvis, a profound, invasive pressure. It burned, but beneath the burn was a strange, deep thrumming pleasure, echoing the sensation Harry’s air had created but amplified a hundredfold. "More?" Harry asked, hesitant.

"Yes!" Sophia gasped, pushing back against him. "More! Fill it!" Mrs. Gable watched intently. "Slowly, Harold. Steady. She’s taking you beautifully."

Harry pushed deeper, inch by inch, Sophia’s body accommodating him with surprising ease after the initial breach. The burning subsided, replaced by an overwhelming sense of fullness, of being utterly claimed. Sophia moaned, low and guttural, her head dropping between her shoulders. It felt primal, raw, a connection that bypassed thought. Harry groaned, his hands gripping her hips tightly. "You feel… incredible," he breathed, his voice strained. "So tight… everywhere… deep."

He began to move, shallow thrusts at first, pulling back slightly before sinking deep again. Each stroke dragged against Sophia’s sensitized inner walls, igniting sparks of pleasure that radiated outwards, mingling with the deep, resonant fullness. It wasn't like vaginal sex; it was sharper, more intense, concentrated in that deep channel. Sophia felt her earlier orgasm building again, but differently – deeper, hotter, centered right where Harry filled her. "Harder!" she gasped, pushing back frantically against him. "Fuck me harder! Please!"

Harry obeyed, his thrusts gaining force, his hips slapping against her buttocks. The wet, rhythmic sound filled the room. Sophia cried out with each deep penetration, the pleasure cresting rapidly, shockingly intense. Mrs. Gable watched, her own hand drifting unconsciously between her thighs, her breath coming in short pants. "Yes! Oh, ducklings! Look at her take him! Look at him fill her! Fuck her! FUCK HER!"

Sophia felt the peak hit her like a physical blow. It wasn't a wave; it was an explosion detonating deep in her core, centered on the relentless friction of Harry’s cock stretching her anus. Her vision whited out. Her body locked rigid, every muscle clenching around him. A raw, animalistic scream tore from her throat, echoing Mrs. Gable’s earlier cries. Harry shouted, his thrusts becoming frantic, uncontrolled. "SOPHIA! FUCK! I’M—!" His body jerked violently against hers as his own climax ripped through him, deep inside her tight channel, pulsing hotly. Sophia felt the hot rush deep within her bowels, the sensation utterly alien and intensely intimate, triggering another violent spasm that wracked her body. They collapsed forward together onto the carpet, Harry draped over her back, both trembling, gasping, utterly spent, fused together in the aftermath of a profoundly primal, unexpectedly easy, and intensely shared pleasure. The camcorder’s red light blinked steadily.

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