She was already on her hands and knees when I walked into her bedroom. The door was half open like she wanted me to see. Her shorts were shoved down to her knees and her bare ass was up in the air, cheeks spread just enough that I could see everything. My cock got hard instantly.
"Fuck, sis," I said, voice low. "You been waiting like that for me?"
She looked back over her shoulder, face flushed. "Shut the door and get over here. Mom's not home for hours."
I kicked the door closed and stripped fast. My dick was already leaking by the time I knelt behind her. No slow shit this time. I grabbed her hips, lined up, and shoved straight into her wet pussy in one rough thrust. She gasped and pushed back, taking every inch.
"Goddamn, you're soaked," I growled, pulling out and slamming back in. The slap of skin on skin filled the room.
"Been thinking about my cock all day?"
"Yes," she hissed. "Harder. Fuck me like you mean it."
I did. I fucked her deep and fast in doggy, hips snapping, balls slapping against her clit with every stroke. Her tits swung under her and she reached back to spread her ass wider for me. I watched my cock disappear into her tight hole again and again, shiny with her juices.
"Pull my hair," she demanded.
I fisted her ponytail and yanked her head back, arching her spine so I could pound even deeper. The angle let me hit that spot that made her moan loud and filthy. "You like your brother's dick stretching you out, don't you? Say it."
"I love it," she panted. "Love getting fucked doggy by you. Don't stop."
I reached under and rubbed her swollen clit in tight circles while I kept thrusting. Her pussy clenched around me, getting tighter, wetter. She came hard, shaking, juices running down my balls. I didn't slow down. I kept railing her through it, chasing my own orgasm.
When I was close I pulled out, flipped her onto her back for a second just to shove back in from behind again, doggy once more because she begged for it. "Fill me up," she said. "Come inside your sister."
I buried myself to the hilt and unloaded, pumping thick ropes deep into her. We stayed locked like that, breathing hard, my cock twitching inside her until I finally pulled out and watched my cum drip from her used pussy.
She collapsed onto the bed with a satisfied groan. "Round two in ten minutes," she said. "Same position."
I was already getting hard again.
