I shoved my sister against the kitchen counter the second our parents left for the weekend. She was eighteen, same as me, and we had both been dancing around this filthy urge for months. Her shorts were already soaked when I yanked them down. "You want my cock, don't you, sis?" I growled right in her ear. She moaned and pushed her ass back against me. "Fuck yes. I want you to fill me up."
I didn't waste time. I dropped my pants and slammed my thick dick straight into her dripping pussy. She was tight and hot, gripping me like she was made for it. "Oh shit, brother, pound me," she hissed. I grabbed her hips and fucked her hard, the wet slaps of skin on skin echoing through the empty house. Every thrust pushed deeper, and she kept begging for more. "Cum inside me. I want your load."
I flipped her around and lifted her onto the counter. Her legs wrapped around my waist as I drove back in. Her tits bounced with every stroke. I sucked on one nipple while my cock stretched her open. "You're gonna take every drop," I told her. "I'm gonna breed this cunt." She clenched around me when I said that, her eyes going glassy with lust. "Yes, knock me up. Fill your sister's pussy with cum."
We moved to the living room couch. She got on all fours and I mounted her from behind, pounding even harder. My balls slapped against her clit with every thrust. Sweat ran down my back. I reached under and rubbed her swollen nub until she screamed and came, her walls milking my shaft. I didn't stop. I kept fucking through her orgasm, chasing my own. "I'm close," I warned. "Don't pull out," she panted. "Breed me."
I buried myself to the hilt and exploded. Thick ropes of cum pumped deep into her fertile womb. Pulse after pulse flooded her, overflowing around my cock and leaking down her thighs. She pushed back, grinding to take every spurt. "Fuck, yes, give it all to me."
We didn't stop there. I stayed hard and flipped her onto her back. I slid back into her cum-slick pussy and fucked her slower but deeper, stirring my load inside her. "Feel that? That's my seed swimming up to your eggs." She wrapped her legs tighter and clawed my back. "More. I want to be pregnant with your baby."
Round two lasted longer. I made her ride me, watching her tits jiggle while she bounced on my cock. Cum and her juices mixed into a creamy mess that coated us both. When I came again I held her down, grinding my spurting head right against her cervix.
She came with me, shaking and moaning about how full she felt.
Later in the shower I bent her over and took her again, water sluicing over us as I pumped another load into her. By morning she was walking funny, my cum still leaking from her well-used hole. We knew one of those thick creampies had done the job. She was going to swell with my child, our dirty little secret growing inside her.
We spent the rest of the weekend repeating it in every room, her begging for more cum and me giving it to her raw. By Sunday night her belly already felt heavier, and we both smiled knowing she'd soon be showing. My sister was bred, and we weren't stopping.
