The Swapping Device
Copyright© 2025 by JohnManTD
Chapter 1
Erotica Sex Story: Chapter 1 - By luck (or fate) James stumbles onto a magical device that allows him to swap anything with anyone. Body parts, personality traits, breasts, entire bodies... Follow him on his journey of self-discovery as he navigates the world with this new find. This is chapters 1-5 of my mainline story. New chapters are released weekly to my Patreon which is generally 2 chapters ahead of the public.
Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa Ma Fa Mult Consensual Mind Control NonConsensual Lesbian BiSexual Heterosexual Shemale TransGender Fiction Science Fiction Body Swap Magic Polygamy/Polyamory Exhibitionism Lactation Masturbation Oral Sex Safe Sex Sex Toys Tit-Fucking Big Breasts Body Modification Size Small Breasts Transformation
I kick a pebble down the sidewalk, watching it skitter into the gutter. Another aimless afternoon in suburban LA, the sun beating down on my neck, making me wish I’d worn a hat. The mall was a bust today--nothing caught my eye, and the crowds were too thick for my liking. Living with my parents at 25 isn’t exactly glamorous, but it’s rent-free, and my job at the tech startup barely covers my student loans. Still, the boredom gnaws at me, a constant itch I can’t scratch. Days blend into each other, and I crave something--anything--to shake things up. Maybe that’s why, when I spot something glinting in the bushes near the park on my way home, I veer off the path to check it out.
It’s a sleek, black gadget, about the size of a smartphone, half-buried under some leaves. I brush off the dirt, turning it over in my hands. The screen flickers to life as I touch it, displaying a simple message: “Select targets. Choose traits. Press Swap.” There’s a big button labeled “Swap” and a small slot that might be for notes or cards. Weird. It looks high-tech, but the interface is almost too basic. Probably some kid’s science project or a prank. I snort, muttering to myself, “Swap traits? Yeah, right. What a stupid joke.” Still, I slip it into my pocket. Free gadget, right? Might as well take it home and mess with it later.
The walk home is quiet, just the hum of distant traffic and the occasional chirp of a bird. My mind keeps drifting back to the device, though. What if it actually works? Nah, that’s ridiculous--stuff like that only happens in movies or weird online stories. But the idea lingers, tickling my curiosity. As I turn onto the main street, I spot a perfect chance to test it. A fit woman jogs toward me, ponytail bouncing with each step. She’s the LA stereotype--tight leggings hugging her toned legs, sports bra showing off her flat stomach, earbuds in. On a bench nearby, an old man sits, tossing breadcrumbs to pigeons. He’s got that peaceful vibe, like he’s got nowhere else to be.
What the hell, might as well see what this thing does. I pull out the device, point it at them, and select “lower half” for both. My finger hovers over the Swap button, a smirk tugging at my lips. This is gonna be dumb. I press it.
Zzzztttt
A faint buzz hums through the air, and then--holy shit. The jogger stumbles mid-stride, her legs suddenly replaced with the old man’s wrinkled, hairy ones. She slows down, her pace turning clumsy, those veiny legs looking absurd under her tight leggings. She mutters something, probably thinking she’s off her game, but keeps going, adjusting her stride like it’s no big deal. Meanwhile, the old man shifts on the bench, his lower half now smooth, toned, and feminine. Those sexy, tanned legs stick out from his baggy trousers, and he stretches them, looking confused but not freaked out. He stands up, takes a few steps, and I swear there’s a spring in his movement he didn’t have before.
My jaw drops. This isn’t a prank--it fucking worked. But neither of them notices. The jogger doesn’t scream about her new legs, and the old man doesn’t gawk at his. They just ... adapt, like reality bent to make it normal. My heart slams against my ribs, palms sweaty. This is insane. I fumble with the device, select them again, and swap back.
Zzzztttt
Everything snaps back. The woman’s pace picks up, her legs youthful and strong again, and the old man sinks back onto the bench, his weathered legs restored. They go on like nothing happened, oblivious. I’m the only one who knows.
I bolt home, legs moving faster than my brain can keep up. The device actually swaps traits--body parts, even--and no one else sees it. The possibilities hit me like a freight train, each one more thrilling than the last. I’ve always had this thing for transformation, a secret kink I’ve kept buried. Changing bodies, mixing traits--it’s the stuff of my wildest fantasies. And now it’s real.
I sneak past the living room where Mom--Stacy--is glued to her cooking show and head straight to my room. Door shut, I collapse onto my bed, pulling the device out. The screen shows a history log with just the one swap listed. So it tracks what I do--good to know. My mind’s buzzing too loud to stop now. I need to test this more, figure out its limits. Strangers were a start, but what about someone closer? Someone I can watch up close. Like Mom.
I head downstairs, finding her in the kitchen, humming as she preps dinner. Her rich brown hair’s tied in a messy ponytail, a few strands loose around her face. She’s in a floral apron over jeans and a blouse, her curvy figure swaying as she chops vegetables. She’s the nurturing type, always keeping us grounded, and yeah, she’s hot in that MILF way I’ve never let myself linger on. Until now.
Let’s start small--hair color. Hers is a warm chestnut; mine’s a lighter brown. I aim the device at us, select “hair color,” and press Swap.
Zzzztttt
A tingle prickles my scalp. I dart to the hallway mirror, and there it is--my hair’s now her chestnut shade, richer and darker than before. I run my fingers through it, feeling the slight shift in texture. Back in the kitchen, Mom’s hair is my lighter brown, but she doesn’t blink, just keeps slicing carrots.
“Smells good, Mom,” I say, voice still mine.
“Thanks, honey,” she replies, her tone warm as ever. “Dinner’s almost ready.”
She didn’t notice. Holy shit, it worked again. My pulse quickens. Time for something bigger--voices. That’ll be wild. I select “voice” for both of us and hit Swap.
Zzzztttt
“James, can you set the table?” she calls, but it’s my voice coming from her--deep, masculine, totally wrong for her soft features.
“Sure, Mom,” I answer, and her gentle, feminine voice spills from my mouth. It’s like I’m wearing her, and the sensation sends a shiver down my spine. She smiles, oblivious, turning back to the stove. I set the table, head spinning. I’ve got her voice now, and she’s got mine, but to her, it’s normal. This thing’s power is unreal.
Cindy strolls in as I finish, phone in hand, barely glancing up. She’s 19, fit, with a C-cup chest she flaunts in a tight tank top, yoga pants hugging her curves. She’s sharp-tongued and independent, always teasing me about still living here. We sit for dinner--spaghetti and meatballs--and I can’t resist pushing further. What if I swap their roles in my life? Make Cindy act like my mom and Mom act like my sister?
I select “role in James’ life” for both and press Swap.
Zzzztttt
The shift is instant. Cindy sets her phone down, eyes locking on me with concern. “James, how was your day? Did you finish that project at work?” Her voice is nurturing, maternal--nothing like her usual snark.
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