[MF] How my Petite fetish started with my Step Sister.

My age is 25 in this story. My step sister (not related by blood) is 20.

Depending how this is perceived I might post what happened next.

We became stepsiblings when I was already in my teens. She's four years younger, and back then we were inseparable always playing games, watching cartoons, building Legos, or roughhousing in the living room. We'd wrestle around on the floor, climbing on top of each other, laughing and teasing like kids do… though looking back, there was always something about the way she'd sit on me, or the way her tiny body would press up against mine that stirred something in me, even if I didn't realize it yet. It felt innocent at the time, but now? It was the start of something a little darker.

I had moved out a few years back, finally living on my own and enjoying the peace of having my own place. I was away from all the family drama, or so I thought. Then things went south between my mom and my stepdad. There were some serious problems, and before I knew it, my mom called saying she was leaving him… and that she'd be moving in with me. She didn't come alone, she brought my stepsister with her.

When I saw her again, I was stunned. She wasn't the bratty little kid I remembered. She had grown into something unreal, insanely thick and curvy, but packed into the tiniest frame. She's barely 4'11", just an inch shy of five feet, with long, dark hair that drapes down her back like something out of a fantasy. Latina through and through, but with soft, almost Asian features, big dark eyes, smooth skin, pouty lips. Her hips were wide, her ass full and bouncy, her tits straining every tank top she wore. It was insane. She looked like a mix of innocent and forbidden, and I felt it in my gut every time she walked past me around the house in nothing but tight little pajama shorts and oversized shirts that still somehow made her nipples show through.

I've been hitting the gym early, like, 4 AM early, for years. It's my routine, my time before the world wakes up. She noticed that, and recently asked if she could join me. At first, I figured it was just curiosity or wanting to spend more time together. But once she started coming along, everything changed.

What began as casual workouts quickly turned into something more distracting, every ride home left me losing my mind over her. The way her scent hit me when the windows were down, that intoxicating mix of sweat, perfume, and something deeper, almost primal. It clung to her skin, her hair, and even the tight leggings and crop tops she wore, hugging every curve.

She'd sit beside me in the passenger seat, legs pressed close, hips shifting with every movement, and I'd have to fight to keep my eyes on the road. Behind closed doors, I was jerking off to her panties, to the thought of that little body bent over or on her knees. My mind spiraled, imagining what it would feel like to run my hands over her soft skin, to taste her, to make her mine.

One morning, I didn't wake up for my usual 4 AM gym session. She got worried and came to check on me. She walked into my room wearing a tiny pajama shirt with no bra underneath and tight shorts that showed off her legs. The shirt was thin enough that I could see her nipples poking through, and she smelled intoxicating — so feminine, so erotic, it hit me like a shock.

She leaned in close, her breath warm on my skin, asking if I was okay. I was struggling to keep control. Right then, I knew I had to find a way to fuck her. Somehow. Someday. From that moment on, I started planning and scheming how I could make it happen.

After that morning, I couldn't get her out of my head. The way she smelled, those damn pajamas clinging to every curve, it drove me crazy. I was aching to grab her, to fuck that tight little body senseless. But I had to be smart about it. So I started scheming, planning exactly how to tease her, test her limits, and see if she was secretly as hungry as I was before I took what I wanted.

A few days later, feeling better and ready to make a move, I told her I had some errands to run after the gym and asked if she wanted to come along. She said yes without hesitation.

We hit up a sporting goods store, a vitamin shop, and grabbed smoothies, all pretty normal. Then, as I pulled into a Lovers Lane parking lot, she looked over at me, biting her lip nervously.

"Is… is this what I think it is?" she asked quietly, eyes wide.

I smiled and nodded. "Yeah. You wanna come in with me?"

She hesitated, fidgeting with her hands, then whispered, "Okay… I guess."

My cock went rock hard the moment she said it.

We stepped inside, and I watched her every move. She tried to act casual, but her wide eyes gave her away, nervous, curious, and damn near electric with anticipation. I could tell she wanted to touch everything but was holding back, biting her lip and fidgeting with the hem of her shirt.

When she stopped by the lingerie, her fingers trembling slightly as she brushed over a fishnet cheerleader outfit, I couldn't resist.

"You'd look really good in that," I teased, letting my voice drop low and playful.

She glanced up at me, cheeks flushing deep red. "You really think so?" she whispered, voice barely audible.

Hell yes, I thought. I was imagining her in it already, the way it would hug her curves, leave little to the imagination, and how those big dark eyes would look when she caught me staring.

"Absolutely," I said, grinning. The heat between us was thick enough to cut with a knife.

She stared at me, surprised and nervous, her face flushed bright red. She kept playing with the hem of her shirt, fingers twitching as she fidgeted. She couldn't hold my gaze for long, but when our eyes met, her breath hitched, heavy and shaky, betraying how turned on she was.

I could tell she was overwhelmed but curious, caught between wanting to run and wanting to stay. The tension in the air was thick, and I was dying to see how far she'd let this go.

After a moment, she broke the silence and asked softly, "So… what exactly are you looking for here?"

I shrugged casually, trying to keep my cool but feeling the heat building inside. "Honestly? I've been super pent up lately with all the gym and creatine. I need something to help me blow off some steam."

She blinked, clearly surprised but not judging. "Like… what kind of stuff?"

I gave her a smirk. "Something small, tight, like a pocket pussy. I'm into petite things."

Her eyes flickered with curiosity, and I could tell she was imagining more than just a toy. The line between innocent and naughty was getting blurrier by the second.

We wandered deeper into the aisles, eventually finding the fleshlight section, rows of neatly packaged toys, each one more detailed than the last. Some had anime girls on the boxes, others featured porn stars. She scanned them with wide eyes, pretending to be casual, but I saw her pupils darting with curiosity.

She leaned in a little and asked, "So… which one would you pick?"

I looked them over, playing it cool. Then I grabbed one that had a petite, slutty-looking model on the cover, the one that looked the most like her.

"This one," I said.

She glanced at the box, then up at me, confused. "Why that one?"

I met her eyes, feeling my heart pounding. "Because she kinda looks like you."

Her breath caught in her throat. She didn't say anything. Her face flushed again, and she looked away, silent. I thought maybe I pushed too far, that I fucked up. But she didn't walk away. She just kept standing there, clutching her smoothie, breathing slow and deep.

Something had changed. And I knew she felt it too.

I didn't say another word. I just walked toward the front and rang the little bell at the counter, setting the toy down like it was no big deal, though my cock was throbbing through my pants.

The silence behind me was loud. I didn't dare look back at her.

Then I heard her footsteps… slow, hesitant.

Without saying a word, she stepped up beside me, and placed something else on the counter.

A pink, remote-controlled Bluetooth vibrator.

My heart almost stopped. I stared at it, then at her, but she wouldn't meet my eyes. Her face was flushed deep red, and she looked like she might pass out from how hard she was blushing… but she didn't take it back.

I could barely keep it together. My cock was rock hard, twitching, like it wanted to jump out and fuck her right there in front of the cashier.

The clerk finally came out and raised an eyebrow, glancing between the two of us. "Just these?"

I cleared my throat. "Yeah… just these."

She stood quietly, biting her lip, her hands trembling just slightly. We walked out together in silence.

But everything between us had changed.