I shoved my sister against the kitchen counter the second our parents left for the weekend. Her short skirt rode up her thighs as I grabbed her hips hard. "You know why you're here," I growled in her ear. "You're gonna take my cock and get knocked up tonight."
She moaned, already wet from the way I talked to her. "Fuck yes, big brother. Breed me. Fill my pussy until it takes."
I yanked her panties down and slapped her bare ass. My dick was rock hard in seconds, thick and leaking. I rubbed the head along her slit, feeling how soaked she was for this dirty shit. "Beg for it," I ordered.
"Please, fuck me raw," she panted, pushing back against me. "Shove that cock in your little sister's cunt and pump me full of cum. I want your baby."
I slammed into her in one thrust. Her tight pussy gripped me like a vice, hot and dripping. I fucked her hard right there, the counter digging into her stomach while I pounded deep. Every stroke slapped my balls against her clit. She screamed my name, telling me to go harder, to breed her like the slut she was for me.
I didn't pull out. I never did with her. I drove in balls-deep and unloaded, thick ropes of cum shooting straight into her womb. She came with me, her walls milking every drop as I kept thrusting to push it deeper. "Take it all," I grunted. "That's your brother's seed. Gonna make your belly swell."
We didn't stop there. I dragged her to the couch and bent her over the arm. My cock was still hard, coated in our mixed mess. I shoved back inside her sloppy hole and fucked her again, slower but just as deep, grinding against her cervix. She reached back to spread her ass cheeks so I could watch my cum leak out around my shaft.
"More," she begged. "Don't stop until I'm pregnant."
I flipped her onto her back, hooked her legs over my shoulders, and railed her missionary style. Her tits bounced with every thrust. I squeezed them, pinching her nipples while I told her exactly what was happening. "Your brother's cock is owning this pussy. Gonna flood it again and again until you're carrying my kid."
She came hard, squirting around me, and I followed, blasting another huge load inside her. I stayed buried, letting it soak in. We fucked three more times that night—on the floor, in the shower, and finally in her bed. Each time I came deep, no condom, no pulling out.

By morning her pussy was a creamy mess, my cum constantly trickling down her thighs.
She lay there with her legs up, smiling. "I can feel it working already," she whispered. "Your baby is in me."
I slid back inside her one last time, slow and filthy, just to make sure every drop stayed where it belonged.