I found my stepsister's adult content ... and she wanted me to film her

There’s a lot of downtime in a California suburb if you’re a college student who’s not, like, actually in college half the time, which meant I lived with my dad, his new wife and my nineteen-year-old stepsister. Most of my time I was either gaming in my room, lifting in the garage, or doomscrolling on my phone in search of anything remotely interesting. The algorithm, as always, delivered.

It started the usual way: an Instagram spiral. A hot girl account led to another, and another, and then suddenly it was all TikTok thirst traps and “subscribe to my OF for the good stuff!” in the bios. Nothing new. The surprise was how one girl, in the wild tangle of curvy influencers, looked so familiar that I almost dropped my phone.

She was in a white halter crop top and a tiny tennis skirt, giving the camera an over-the-shoulder “caught me” smirk. Her hair was long and glossy, nearly black, and her makeup was natural enough to make you think she didn’t care, but perfect enough to know she did. The face, though: I’d seen it a million times. Usually with her nose buried in a fantasy novel at the kitchen table, or glancing up at me with big brown eyes and that awkward smile.

It was Angela. My stepsister. Not “step” in the way people joke about online, but the literal girl my dad married into the family when me and her were in high school, shy and barely out of braces. She was “the good girl.” National Honor Society, never got grounded, never partied, probably still peed with the bathroom door closed. She was a homebody, never wore anything but jeans or sweats, never made eye contact unless you addressed her directly.

And here she was, on my fucking phone screen, arching her back so her ass looked like it was going to punch through the fabric, one hip cocked, tongue peeking out between white teeth.

I stared. I don’t even remember blinking. Then I scrolled to the next pic and my jaw dropped. This one was basically porn: Angela in a thong, on her knees, ass up, hands behind her back, cheeks spread wide to show the see-through lace wedged between. No face in this one, but the way she squinted over her shoulder, fuck, it was so obviously her.

The account name was “AngelButt.” No last name. The bio was a pun about being “so good it’s a sin.” There was a link in the bio. “OF link below 😇🍑.”

I felt my pulse hammering in my ears. There had to be a mistake. This was not Angela. Not the Angela who alphabetized her bookshelves and said “darn” when she dropped a glass. But the more I looked, the more sense it made. She had the body for it: a tiny waist, big tits for her frame, but most of all, the kind of ass that made people do double takes even when she wore jeans. In high school it was a joke, how she could squat more than the football team and her leggings were basically painted on. Still, I never imagined this.

I spent the next fifteen minutes in a wormhole, scrolling through every post, every story. All the videos were low-res, selfie angle or tripod, the background always the same: a string-lighted wall, pink comforter, a bunch of plushies. Her room … I’d been in there to fix her WiFi last summer.

She was a fucking star. Not a pro, but close enough. She had a hundred thousand followers, and every post got thousands of likes. There were clips of her just walking away from the camera in yoga pants, twerking to trending audio, jumping up and down in slow motion. Every few posts she’d “reward” her fans with more skin: cheeky thong try-ons, stretching on all fours, kneeling on the bed in a see-through bodysuit. The comments were exactly what you’d expect: a sea of “jesus christ that ass” and “can you sit on my face plz” and “marry me.”

I was locked in, fascinated, hard as a fucking rock under the table, but also sweating like I was the one who got caught. My fingers trembled when I finally clicked the OnlyFans link. It took me to a locked homepage with a three-second looping preview. Her, in a plaid miniskirt and a knotted shirt, doing the “oops, I dropped my pencil” routine in front of the camera. The skirt flipped up, and for a split second, you got the full bare-ass shot, then her hand came down and slapped it. The bounce was unreal.

Subscription: $19.99 a month. “DMs open for customs :)” I stared at the page. For way too long. And then, without thinking, I entered my email (a burner), created an anonymous username, and subscribed.

I told myself it was curiosity. Like rubbernecking at a crash. In reality, it was pure, animal want. I’d never admit it out loud, but I was obsessed with that bubble butt. I wanted to see everything she posted. I wanted to see if she did more. Maybe I wanted to see if she ever talked about me.

I got access instantly. The paywalled posts were even crazier than the public stuff. Full ass shots, close-ups of her squeezing her cheeks and running oil over them. Sometimes she’d spread and bounce them, sometimes she’d jiggle so hard the phone nearly fell off its stand. There were even vids of her in nothing but glasses and a shy smile, slowly peeling down her panties. She never showed pussy, not directly. She was careful, keeping everything right on the edge.

It made sense, though: Angela was all about the tease.

There was a group of fans who commented on every post, and I started chiming in with them. I used a fake name, but my comments got hearts every time. “That ass is perfect,” I wrote, and she replied “Thanks 😳.” I’d leave tips—nothing huge, just enough to show appreciation—and she always said thank you.

After a week, I was obsessed. I had the notifications turned on for new uploads. If I was home and got a buzz, I’d drop whatever I was doing, lock my bedroom door, and scroll. Every night I’d find myself jerking off to her posts, then feeling guilty as hell after.

The guilt didn’t stop me. If anything, it made it hotter.

I started watching her in real life, too. Angela usually wore sweats or huge tees at home, but now I noticed how she lingered at the fridge, bent at the waist, always aware of the space her ass occupied. Sometimes she’d catch me staring and just blush and hurry out of the room. Sometimes she’d shoot me a weird look, then look away. She definitely started wearing tighter clothes around the house, or maybe I was just noticing for the first time.

A couple times, she left her door open when she got ready for bed. I caught a glimpse once: her in a baby-blue thong, yanking a tee down over her boobs, the pale shelf of her butt on full display. She didn’t see me, but I jerked off twice that night thinking about it.

This went on for weeks. Every few days, she’d upload a new video: sometimes full twerk routines, sometimes “Q&A” sessions where she answered dumb questions from horny dudes, sometimes “request” posts where she tried on whatever someone bought from her Amazon wishlist. Once, she did a slow-mo oil rub and I thought I’d pass out. I left a $50 tip and a comment: “That’s the hottest thing I’ve ever seen.” She responded with a wink emoji and “love my fans ;).”

Things started getting weird when she posted a story asking her followers to guess “what state I’m in.” I knew the answer instantly: the background was our garage door. I nearly DM’d her to warn her, but realized I’d have to admit I was her stepbrother and subscribed to her OnlyFans, so I said nothing. But then I started to wonder if she was doing it on purpose. Testing me, or someone else close to her.

Angela started acting…off, too. She was quieter than usual, more withdrawn, and spent hours in her room. But when she was around me, she seemed wired, almost excited. She’d fidget with her hair, tug at her hoodie, avoid my eyes, or look at me a little too long. Sometimes she’d “accidentally” brush past me in the hallway, and her ass would bump my hip. Once she tripped and landed against me, and I could feel the heat radiating from her skin even through her yoga pants.

My imagination ran wild. I fantasized about her every night, sometimes during the day, sometimes when she was in the next room over. I started to wonder if I’d go insane if I didn’t do something about it.

The answer came one Friday, three weeks after I subscribed.

Our parents announced they were driving to San Diego for the weekend, some “adult getaway” to celebrate their anniversary. They left at noon, with a cooler of drinks and matching sunglasses, and told us not to burn the house down. By three, Angela hadn’t left her room. She only emerged when I was halfway through a pizza, wearing a big hoodie and tight leggings.

She was quiet. We ate in silence, except for her phone buzzing every couple of minutes. I watched her peel the cheese off her slice and pop it in her mouth, then lick her fingers one by one.

She looked up and caught me staring. For once, she didn’t look away.

“Do you have plans tonight?” she asked.

“Uh, nope.” I tried to sound casual. “Might just game. Maybe binge something.”

She nodded. “Cool. I’m going to be working, so just don’t bug me.”

“Working?” I grinned. “Like, job job?”

Her face stayed totally blank. “Yeah, job job.”

She stood, gathered her plate, and turned to the sink. Her ass moved in slow motion. I wondered if she knew I was watching, or if she just didn’t care.

After dinner, I retreated to my room and tried to focus on Warzone, but I couldn’t. My mind was on her. I checked her OnlyFans. New post, ten minutes old.

It was a full-length video, fifteen minutes, captioned: “Stretching for my fav fans.” The preview was a shot of Angela on her bed, in a crop top and black thong, one leg high in the air. I clicked play. The first five minutes were her doing yoga stretches, back arched, ass in the camera every other second. Then she rolled onto her stomach and started twerking in slow motion. She massaged her butt with both hands, kneading the cheeks, slapping them, moaning softly into the sheets. It was the hottest thing I’d ever seen, hands down.

The comments section was already exploding. I joined in, “You’re killing me with this one.” She replied instantly: “Haha thanks! Trying something new 😉.”

I watched the vid three times, then I couldn’t take it anymore. I needed to jerk off. I slid my hand down my gym shorts and started stroking, the memory of her ass fresh in my brain. I didn’t even try to be quiet.

A minute later, I heard a soft knock at my door.

I froze, cock in hand. “Uh, yeah?”

Angela’s voice was quieter than I’d ever heard it. “Can I come in?”

I frantically pulled my shorts up and sat up straight. “Sure. One sec.”

She opened the door and stepped inside. She had shed her hoodie, and was just in a tank top and the same leggings. Her nipples were hard enough to poke through the fabric.

She closed the door behind her and didn’t move. I stared at her, trying to look casual, but my heart was slamming.

She sucked in a breath. “I need to ask you something.” Her cheeks were burning red.

“Shoot,” I said.

She didn’t speak for a second. Then, “Are you ‘CaliGuy19’ on OnlyFans?”

My soul left my body for a full three seconds. My face must have been a billboard of guilt.

She took a step closer. “You’re not in trouble. I just, I recognized your username from your old Insta. You’re not exactly subtle.”

I wanted to die. “I’m… sorry. I found your page by accident. I didn’t mean to—”

“You’re my biggest fan,” she interrupted. “Like, literally. You’ve tipped more than anyone. You comment on every video.”

I swallowed. “Yeah. Sorry. I just, I didn’t want to embarrass you.”

Angela took another step. “I wasn’t embarrassed,” she whispered. “I was turned on.”

I stared. “What?”

She twisted her fingers together, breathing hard. “It’s fucking weird, I know. But after I found out, I kept thinking about it. I started posting more because I wanted you to see.”

My cock was hard again, and I was sure she could see the tent in my shorts. I felt dizzy.

She glanced at my crotch, then looked back at me. “Do you want to help me film something?”

I nodded, too fast. “Yeah. God, yeah.”

She smiled, nervous and excited, and turned toward the hallway. “Come to my room in five minutes. And bring your phone.”

I watched her leave. I gave myself ten seconds to process, then went to the bathroom to splash cold water on my face and adjust my shorts so I didn’t look like a total perv.

Her bedroom was lit with the same pink fairy lights as in her videos. The sheets were fresh and there were three plushies stacked on the pillow. In the center of the bed, Angela was on her knees, hands in her lap, looking up at me. She wore nothing but the leggings and a thin, ribbed crop top that barely covered her tits. She’d taken off her glasses, but they sat on the bedside table.

She smiled when she saw me, all shy, but with a glint in her eyes.

“Hey,” she said.

“Hey.” I held up my phone. “Ready?”

She nodded, and turned so her back was to me, then pulled her hair into a ponytail. “Start with a close-up. Like, right on my ass. It gets the best reaction.”

I held the phone and hit record. Her bubble butt was unreal, tight and round and so big for her size it looked photoshopped. She arched her back and looked over her shoulder, biting her lip.

“Tell me what to do,” she whispered.

“Uh. Can you, like, shake it? Twerk?”

She giggled, then started twerking. She bounced it slow at first, then faster, cheeks jiggling and clapping. I got closer, filming from every angle. The leggings were sheer enough to show the curve of her cheeks and the shape of her thong underneath.

I found myself reaching out, unable to stop. I put a hand on her hip, and she shivered.

“You can touch,” she said, voice barely audible. “Just don’t stop filming.”

I ran my hand over her ass, squeezing it, feeling the warmth and the way the muscle flexed under my palm. She pushed back into my hand, moaning softly.

“Harder,” she whispered.

I slapped her ass, and she gasped. The camera caught every second. She dropped to all fours, arching even more, her face turned to the side so I could see her smile. “Now peel them down.”

I hooked my fingers in the waistband and tugged her leggings over her hips. They came down slowly, and her thong rode up between the cheeks. I pulled that down, too, and her bare ass sprang free. It was flawless. No tan lines, smooth as fuck, the heart shape even more pronounced in real life.

Angela glanced back at me, cheeks red, but her eyes wild. “Get closer. I want them to see everything.”

I aimed the camera, and she spread her cheeks with both hands. Her pussy was smooth, the lips small and tight. I couldn’t believe this was the same girl who, five hours ago, wouldn’t look at me across the dinner table.

She looked back and tilted her head. “You can fuck me if you want. They’ll love that.”

I almost came just hearing it. My hands shook as I set the phone on the tripod. She wiggled her ass at me, and I dropped my shorts, cock standing straight out.

Angela laughed, low and dirty. “Guess you really are my biggest fan.”

I knelt behind her and lined myself up. She was already wet, the tip sliding in easy, her pussy hugging me perfectly. She moaned, louder than I’d ever heard, and pushed back so I bottomed out.

“Fuck,” she hissed. “Harder. Give them a show.”

I grabbed her hips and started pumping, watching the way her ass rippled with every thrust. I slapped it, squeezed it, then dug my fingers in so hard she squealed.

She braced on the sheets and started moving against me, grinding in circles, making it even tighter. The sound was obscene, wet and sexy, and I couldn’t believe this was real.

Then we tried to slow down, giving them a sensual act as well.

“Does it feel good?” Angela whispered, her voice soft and breathless. She slowly lowered her chest to the bed, pressing her face gently into the sheets while keeping her knees wide. She arched her back and lifted her huge, round ass higher, offering herself completely.

“Like this?” she asked softly, giving a small, shy wiggle of her hips.

“So good,” I groaned, my hands gently gripping her soft, heavy cheeks. “You feel incredible.”

I started thrusting into her with long, deep strokes, watching in awe as her massive bubble butt rippled beautifully with every movement. The way her body responded to me, warm, wet, and so incredibly soft, made my head spin. I ran my hands over her smooth skin, squeezing and caressing her ass as I moved inside her.

Angela let out quiet, sweet moans into the pillow, pushing back gently to meet my rhythm. Her long dark hair spilled across her back, and every time I sank into her, her thick cheeks pressed warmly against my hips.

I leaned forward, covering her body with mine, and kissed the back of her neck tenderly. She shivered beneath me, her pussy tightening around my cock in response.

Finally, I slammed into her and came, harder than I ever had in my life. Angela arched her back and moaned, then collapsed on the bed, ass still in the air, dripping. I watched myself pull out, still half-hard, her pussy red and leaking. I grabbed the phone and filmed the creampie, the pearly seed leaking out from her pussy and dripping onto the sheets.

“Is that alright?”

“Of course.” Angela laughed, breathless. “We’re gonna be rich.”

She rolled over, tits out, and reached for the phone to stop the recording. I flopped onto the bed next to her, exhausted, not caring that my cum was still dripping down her thigh.

She smiled at me, totally relaxed, then snuggled in close, her head on my chest.

“We should do that again,” she said, already scrolling through the video. “But next time, we try anal.”

I stared at the ceiling, dizzy with adrenaline, and grinned. “Anything you want, AngelButt.”

Thank you for reading! You can find many of my other stories on [PornReads](https://pornreads.com/).