I came home from college for the weekend and found my sister Lisa in the kitchen wearing nothing but a thin tank top and panties. She was 22, same as me, and we'd always been close but never like this. The house was empty. Mom and dad were gone for the night.
"Damn, you look good," I said, staring at her ass as she bent over the fridge.
She turned and smirked. "You checking me out, bro? Been a while since you saw me like this."
I didn't answer with words. I walked over, grabbed her hips, and pulled her against me. My cock was already hard in my jeans. She felt it and pressed back.
"Fuck, you're big," she said, reaching down to rub me through the denim. "Want to do something about it?"
We didn't talk much after that. I spun her around, yanked her panties down, and bent her over the counter. Her pussy was shaved and already wet. I dropped my pants, spit on my hand, and rubbed the head of my cock against her slit.
"Put it in," she said. "Don't be gentle."
I slammed into her in one thrust. She was tight and hot, gripping me all the way down. Lisa moaned loud and pushed back, meeting every stroke.

I fucked her hard, skin slapping, her tits shaking under the tank top. No slow build-up, just raw pounding.
I reached around and rubbed her clit while I drove into her. "You like your brother's cock, don't you?"
"Yes, fuck yes," she gasped. "Deeper. Wreck my cunt."
We moved to the living room couch. She got on all fours and I took her from behind again, spreading her cheeks so I could watch my dick disappear into her. She reached back and fingered her own ass while I pounded her pussy. I slapped her ass hard, leaving red handprints.
After a while she flipped over and pulled me on top. Legs wrapped around me, she whispered dirty shit in my ear. "Cum inside me. Fill your sister up."
I did. I buried myself balls deep and shot load after load into her. She came at the same time, cunt pulsing around me, soaking the couch.
We didn't stop there. Later that night she sucked me off in the shower, swallowing every drop. Then we went to her bed and I ate her pussy until she squirted on my face. She rode me reverse cowgirl, ass bouncing, telling me how much better my cock was than any boyfriend she'd had.
By morning we'd fucked in every room. Raw, direct, no holding back. Just two adults who wanted it and took it. She kissed me goodbye at the door when I left, tasting like my cum.
"Next weekend," she said. "Don't be late."