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My big futa sister

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My sister is a futanari, and I fell madly in love with her. She falls in love with me too. Sarah is my older sister, 20 years old. She's shy and awkward, meticulous, and very diligent at school. She's always been very careful in revealing her secret, and it's worked so far. She's always hated not being a normal girl, and she doesn't have a good relationship with her penis, despite the pleasant sensations it makes her feel. Even though she is objectively very beautiful, both for her face and her body, she still doesn't have a boyfriend, strange huh? My sister and I have always been close, and given our parents' frequent absence for work reasons, we have always managed ourselves at home. This is not to say that there is not healthy competition/skirmish between siblings, as is normal. During a skirmish of these, I discover that Sarah has a penis, and a nice big one too. Our parents know about his little “anomaly”, but they decided to keep it from me Sarah has an almost supermodel body, nice developed natural breasts, high, wide hips and round butt, amazing legs. It has a penis and testicles. It retains pubic hair. Long brown hair and green eyes. Alex, average body, brown hair, brown eyes, athletic, medium tall, messy, shy,

Chapter 1: Stumble and Discovery

The living room smelled of old pizza and laundry detergent that hadn’t quite rinsed out. Textbooks lay sprawled across the coffee table, their pages splayed like wounded birds, while sticky notes clung to the fridge, yellowing at the edges. A single floor lamp in the corner battled the deepening twilight, casting long, breathing shadows across the walls.

Sarah was folded into the worn corner of the couch, one highlighter cap between her teeth, another in her hand. Her long brown hair was a messy curtain over one shoulder. “If I have to read one more theory on post-war economic structures, my brain is going to leak out my ears,” she muttered, the words muffled by plastic.

“Then don’t be an economics major,” Alex said without looking up from his phone. He was slouched in the armchair, one leg dangling over the armrest. “Switch to something fun. Like pottery.”

“Pottery isn’t a major.”

“It could be. You could major in… mud.” He grinned, finally glancing over. “It’s about your speed.”

She threw the highlighter at him. It bounced off his chest. “Says the guy whose idea of studying is rereading the Netflix synopsis.”

“I absorb through osmosis.” He stood, stretching. “My turn for the TV. The game’s on.”

“No way.” Sarah scrambled, snatching the remote from the cushion beside her. “I’ve been waiting all day to watch this documentary. It’s about deep-sea squid. Bioluminescence. It’s basically educational.”

“So is football. It’s a lesson in human suffering and poor financial choices.” He lunged for the remote.

She twisted away, a laugh bursting from her. It was an old dance. He grabbed her wrist, she used her other hand to push at his face, her thumb accidentally pressing against his eyelid.

“Ow! Okay, foul.” He recoiled, rubbing his eye, but he was still grinning. He came at her again, this time getting a hand around her waist and hauling her off the couch. They stumbled together, a tangle of limbs, and fell onto the scratchy area rug.

The air left Sarah’s lungs in a whoosh. Alex was half on top of her, his weight familiar and strange all at once. They were both still laughing, breathless. He made another grab for the remote, which she had pinned under her lower back.

“Give it up, Sarah!”

“Never! Squid are more important than your overpaid ball-chasers!”

He wrestled, trying to roll her. She pushed back, her strength surprising him. In the scuffle, his knee slipped. He lost balance, his body sliding down hers. His hand, groping for leverage on the floor, instead caught the loose waistband of her gray sweatpants.

It happened in a slow, crystalline second.

His fingers, seeking the rug, slid inside the fabric. Past the soft cotton. Down the plane of her lower abdomen. And found not the soft, expected curve, but a thick, firm heat pressed flat against her pelvis.

His laughter died.

Sarah’s breath caught, sharp and silent in her throat. Her entire body went rigid. The world shrank to the point of contact, to his frozen fingers tracing the unmistakable, elongated outline through her thin cotton underwear.

Alex’s brown eyes, inches from her own, widened. Confusion wiped his face blank. His fingers twitched, an involuntary exploration, mapping the length, the ridge, the heavy fullness beneath.

A violent flush of heat, then ice-cold shame, flooded Sarah’s veins. She saw the moment understanding dawned in his eyes—not intellectual, but physical, primal. The confusion melting into sheer, staggering shock.

She shoved him off with a strength born of pure panic. He rolled onto his back on the rug, staring at his own hand as if it belonged to someone else.

Sarah scrambled to her feet, her back hitting the edge of the couch. She yanked her sweatpants up, her hands trembling so badly she could barely tie the drawstring. The living room was dead quiet, the only sound the frantic drum of her own heart in her ears. The shadowed walls seemed to press closer.

“Sarah…” Alex’s voice was a hoarse whisper. He was still on the floor, propped on his elbows. “What… what was that?”

“Nothing.” The word was too high, too tight. “You just… you grabbed my hip bone weird. It’s nothing.”

“That wasn’t a hip bone.” He sat up slowly, his eyes never leaving her. They weren’t disgusted. They were blazing with a bewildered, almost clinical intensity. “Sarah. Talk to me.”

Tears welled, hot and insistent. She hated them. She hated all of it—the body that betrayed her, the secret she’d carried like a stone in her gut since she was fourteen, the look on her brother’s face. The careful, normal life she’d constructed in this cluttered living room was splintering.

“Please,” she whispered, the fight gone, replaced by a hollow dread. “Just forget it. Please, Alex.”

But he was standing now, approaching her not like a brother ready to tease, but like someone navigating a minefield. “I can’t forget it. Is this… is this why you’ve never…?”

“Don’t!” she snapped, wrapping her arms around herself. The documentary’s menu screen had gone dark on the TV, leaving the room in the gloomy lamplight. “Don’t ask me that. Don’t ask me anything.”

He stopped an arm’s length away. His gaze dropped, not to her crotch, but to her face, searching her green eyes, which were now swimming with panic and humiliation. His own expression shifted, the shock tempering into something else, something painfully gentle and unbearably curious.

“Does it… I mean, are you… okay?” he asked, fumbling for words.

A bitter, choked sound escaped her. “Okay? I’m a freak, Alex. A girl with a… a thing. That’s not ‘okay.’ That’s the definition of not okay.” The confession, once started, spilled out in a ragged torrent. “Mom and Dad know. They’ve always known. The doctors called it a ‘variation’ and they just… decided we wouldn’t talk about it. Decided you shouldn’t know. ‘Let her be normal,’ they said. As if that was possible.”

She saw the hurt flash across his face—the betrayal of being kept outside this circle of truth. But it was quickly submerged by that overwhelming, focused attention.

“You’re not a freak,” he said, his voice low and firm.

“You felt it.”

“I did.” He didn’t deny it. He took another half-step closer. The air between them crackled, thick with shattered normalcy and something else, something new and dangerous. “Does it… work?”

The question was so blunt, so devoid of malice, that it punctured her hysteria. She stared at him, her mouth slightly open. Of all the questions—the ones about surgery, or identity, or loneliness—this was the one he asked.

Her silence was answer enough.

A strange, heavy quiet settled over them. The fridge hummed in the kitchen. A car passed outside, its headlights briefly painting a streak of light across the ceiling.

Alex’s gaze was trapped on hers, but his awareness felt everywhere, as if the entire room was charged with the ghost of what he’d felt. His own breathing had changed. It was slower, deeper. The shock had burned away, and in its wake was a dawning, terrifying fascination.

He didn’t move to hug her. He didn’t crack a joke. He just stood there, in the wreckage of their ordinary evening, looking at his sister as if seeing her for the very first time.

Sarah saw it all in his eyes—the concern, the loyalty, the brotherly love, all still there. But woven through it now, unmistakable, was a thread of pure, heat-struck wonder. It pulled at something deep and secret within her, something she spent every day ignoring. A tremor that was not entirely fear ran through her.

The remote control, forgotten, lay on the rug between them. The deep-sea squid would have to wait.

The deep-sea squid would have to wait.

The silence between them was a physical thing, a third presence in the cluttered room. It was swollen with the words they hadn’t said, with the shape his fingers had memorized. Alex’s eyes hadn’t left her face, but she felt his awareness like a brand on her skin, right where his hand had been.

“So it just… works,” he said again, not really a question this time. A statement of baffled fact. His voice was quiet, stripped of any judgment, which somehow made it worse.

“Alex, stop.” Sarah’s own voice was a frayed thread. She took a step back, her calves bumping the couch. She needed space, air, but the walls were right there. “Can we please just… not? I need you to forget this. I need to forget this.”

“How?” The word burst from him, startling them both. He ran a hand through his messy hair, his expression tormented. “How am I supposed to forget? I felt it, Sarah. It’s real. It’s part of you.” He took a hesitant step forward, closing the distance she’d tried to create. “And you’ve been carrying this… alone? For years?”

“Not alone. Mom and Dad—”

“Mom and Dad aren’t here!” he interrupted, a flash of old, sibling frustration cutting through the new tension. “They’re never here. It’s just us. And you didn’t tell me.”

The accusation in his words was a blunt instrument. It shattered her last defense. A sob hitched in her chest, but she choked it back, turning her face away. She stared at a faded water ring on the coffee table, a relic from a long-ago cup.

“I was scared,” she whispered to the stain.

“Of me?”

“Of everything.” She finally looked back at him. The lamplight caught the tears she was refusing to shed, making her green eyes glitter. “Of you looking at me like… like I’m a monster. Or a science project. Or just… different. I just wanted to be your sister. Normal.”

“You are my sister.” He said it with a ferocity that shook her. “That hasn’t changed. That will never change.” He was close now, close enough that she could see the gold flecks in his brown eyes, could smell the faint, familiar scent of his laundry detergent and boy-sweat. “But Sarah… you’re not just normal. You’re… you’re more.”

His gaze flickered down, for a fraction of a second, to the front of her sweatpants, before snapping back up to her eyes, wide with a kind of horrified wonder at his own thought. His breathing had gone shallow.

A treacherous, confusing heat began to uncoil in Sarah’s belly, a sensation utterly disconnected from her panic. It was a physical memory, an echo of the pleasure she only allowed herself in the dark, alone. It was shameful. It was electric. It was responding to the raw, unfiltered attention in his look.

“Don’t,” she breathed, but it lacked conviction.

“Does it feel…?” He couldn’t finish. He lifted his hand, not to touch her, but to gesture vaguely, helplessly.

SHE PANICS.

The coil of heat snapped into pure, undiluted terror. It flooded her system, cold and sharp, wiping away everything else. The room tilted. His curious face blurred. The secret was out, and it was no longer a hidden, manageable truth; it was a living, breathing thing in the room with them, and he was staring right at it. He wasn't repulsed. He was fascinated. And that was a thousand times more dangerous.

A high, thin sound escaped her lips. She shoved past him, her shoulder knocking hard against his chest. She didn't care. She had to get out, to get away from his questions and his eyes and the terrifying new shape of their world. She stumbled into the hallway, her socks slipping on the hardwood floor, making for the sanctuary of her room, for a lock she could turn, for a silence so deep it might swallow this whole awful night.

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