My OnlyFans sister needed a bigger cock for anal... so she used mine

I had been hiding it since sophomore year, which was a stupid amount of work for something that was just anatomy. Big didn’t cover it. Girlfriends tapped out. One of them laughed, then stopped laughing, then said she was not putting that in her ass and I should stop asking. I stopped asking. I did not stop wanting it. Anal was the thing I jerked off to and never got, because the second someone saw me hard, they renegotiated the whole night.

The worst part was who I wanted it from. Sienna … Nineteen, a year under me, and … wait for it, my sister! Same house, same mom and same Wi-Fi. I knew it was wrong every time I thought it. I thought it anyway. College in name only for her. She took two classes and spent the rest of the week filming. Here comes the second surprise, she’s an OF girl, and a pretty damn good one.

Mom knew about the OnlyFans. We were that kind of open, which meant Mom said “be safe, pay your taxes, don’t use the kitchen” and then went to work like her daughter wasn’t getting paid to take things in her ass on camera. Sienna called it the niche. Not girlfriend stuff. Anal, specifically, because she said her hole was the only part of her that looked expensive. And she was right. She had a gorgeous, plump ass that would make any man hard within seconds.

She was a brat about it. Towel on the way to the shower, door never all the way shut, comments at dinner about subscribers who thought they were hung. I kept my mouth shut. If I agreed, she’d ask why I was an expert. The secret stayed in my shorts. The other secret, the one where I got hard listening to her film and then hated myself for it, stayed in my head. It was wrong. She was my sister. It still felt good. That was the part I couldn’t kill.

Mom was on a late shift. I was on the couch with a textbook I wasn’t reading when Sienna came out in a cropped tee and underwear that did not qualify as clothing, phone in her hand, annoyed the way she got when a shoot fell through.

“Another one canceled,” she said. “Guy swore he was eight inches. I get there, it’s a mood. I cannot find a cock that actually fills my ass. I’m losing the ‘too big’ tag because nobody is too big.”

“Tragic.”

She dropped onto the couch beside me, knee over mine. “If I don’t post something that stretches me, the weirdos unsubscribe. They can tell when I’m faking.”

She shifted for the remote. Her hand landed in my lap. Palm, full, right on me through the sweats. I was not even hard yet and her fingers still didn’t have an easy place to sit. Heat went through me so fast I felt sick. My sister’s hand … It felt good anyway. She pressed, once, like she was checking.

“Cole.”

“Get off.”

“That’s not normal.” She looked at my face then down. The brat dropped out of her voice. “You’ve been sitting in this house with that while I complain. And you liked that. Don’t lie. I felt you twitch.”

“You’re my sister.”

“I’m aware.” She took her hand away slowly. “You’re going to sit there and think about how bad you are at hiding things.”

She went to her room. I went to mine. I should have taken a shower. I opened the laptop instead.

Her page was already in the history. I told myself it was once. The newest video was her on her knees, cheek to the mattress and a dildo thrust right into her ass. I knew I should close it, but I shoved the sweats down and wrapped a hand around myself and the wrongness made it better, not worse. My sister on the screen. My cock in my fist, thicker than the pathetic dildo. I matched her moans. I was close when the door opened.

She had the lube in one hand and her phone in the other. She saw the laptop, and me, and her own face over my fist.

“You’re jerking off to my OnlyFans.”

I couldn’t get the sweats up. She looked at my cock. “Wow, you’re perfect!”

“Sienna, shut the fuck up, and close the door!”

“No, your cock is gorgeous.”

“Jesus christ,” I said and tried to hide my erection with a pillow.

“Why can’t you help me film instead? I think it would be better if you finished raw in my ass instead of in your hand.”

“Sienna. We can’t. You’re my sister. This is already—”

“It felt good when I grabbed you. You didn’t pull away first.” Her mouth curled. “I won’t tell Mom if you fuck me in the ass. I’ve been looking for a cock and you’ve been hiding one. You’re bigger than every guy I’ve seen.”

I knew it was wrong, but I couldn’t resist. I dropped the pillow and rose to my feet. Her grin widened as she saw me at full mast, and I couldn’t suppress my grin either. Deep down, this is what I wanted.. I was already following her down the hall.

Her room was already a set. Ring light. Pink rug. Phone on the little tripod she used whenever she filmed herself masturbating or showing toys up her ass. She checked the frame, tilted it down so the shot would be her ass and not our faces, then looked back at me.

Then she looked at my cock.

“Okay. Yeah. That’s the video.” She swallowed. “Lube. A lot. I’m not tearing for content.”

She knelt on the rug and pulled her underwear off. The tee stayed. Everything else was the shot. Sienna was sexy in the stupid ordinary way that had been ruining me for a year: mean mouth, wet blonde hair stuck to her neck, waist I could almost span, tits heavy in the cropped tee when she leaned forward. That wasn’t what the camera was for. She reached back and spread herself, and her ass was the whole point. Bleached pale where a bikini never sat, smooth, round, the cheeks full enough to spill around her own hands. The hole was small and pink and already a little shiny from whatever she’d done before the canceled shoot. Pretty in a way that felt illegal to notice. My sister’s ass. I got harder looking at it.

“You can say it’s hot,” she said. “Everyone else does.”

“It’s your ass.”

“And you’re staring at it like you pay rent.” She tossed me the bottle. “Record’s on in a second. Don’t say my name. Don’t say yours.”

She tapped the phone. The light went red. She dropped her chest to the rug, hips up, and held herself open for the lens.

“Subscribers wanted bigger,” she said, voice turned up for the mic. “So I found bigger.”

I knelt behind her. My cock throbbed. I pumped lube into my palm until it dripped and spread it over that bleached, perfect ass, thumb circling the tight pink rim until it winked. Two fingers. She took the first easy and hissed on the second. I worked her open, watching the shine, the way her hole stretched around my knuckles and tried to close when I pulled them out.

“Enough,” she said. “Put it in slowly. Let them see.”

I set the head against her. It looked obscene. Too thick for the little ring I had just loosened but I pushed. I faced resistance, so I pushed again. Her rim opened a fraction, pale skin going taut, and then the crown popped through. She cried out, real, not the fake one from the video I’d been watching.

“Fuck… don’t, stay.”

I stayed. An inch in my sister’s ass. The camera was eating the stretch: her bleached cheeks framed around my cock, her hole shiny and struggling, lube squeezed out in a ring. I gave her another inch. She shook. Halfway she was talking to the lens and to me at the same time.

“It’s too big. Look at it. Look at what he’s making me take.”

I knew it was wrong, but it felt better than anything I’d talked a girlfriend into. I slid deeper. Three-quarters. Then I was flush, hips against that pale ass, buried in Sienna, her hole stretched wide around the base of me. She moaned like a pornstar.

“Move,” she said. “They need to see it move.”

I fucked her ass raw. Short strokes so the camera could catch the drag, her rim clinging to me every time I pulled back, then swallowing me when I pushed in. Her ass jiggled. The tee rode up. I held her hips and watched myself disappear into my little sister and the taboo sat in my stomach and made me harder. She pushed back.

“Deeper. God, you’re actually … don’t pull out.”

I gave her longer strokes. Almost out, so the head tugged her open, then in to the hilt. The wet sound was huge under the ring light.

“I’m gonna come—”

“Creampie!” she said, still half in the character voice, half not. “Do it.”

I slammed in and came in my sister’s ass, raw, pulse after pulse, grinding against those bleached cheeks while I emptied into her. I stayed buried until it stopped.

She killed the camera with a shaky hand, then shoved the phone at me.

“Film it. Pull out slow. They pay for the mess.”

I took it. I eased out. Her hole stayed open, pink, used, and I watched my cum leak out of my sister’s ass onto the rug while the phone caught every second. She looked back at the lens, wrecked, satisfied, mean.

I stopped the recording. She turned, still on her knees, and kissed me.

“Thanks,” she said against my mouth. “Good brother.”

She took the phone back and smiled at the thumbnail like the taboo had already been edited out. I was still kneeling there, shaking, knowing it hadn’t.

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