We had always been close, but that summer everything changed when our parents left us alone in the house for a week. I was twenty-two, she was twenty-one, both of us adults who knew exactly what we were doing when the tension finally snapped.
It started with her walking around in nothing but a tiny tank top and panties. Her tits pushed against the thin fabric, nipples hard, and her ass cheeks peeked out every time she bent over. I couldn't stop staring. She caught me and smiled that dirty little smile.
"You like what you see, big brother?" she asked, spreading her legs on the couch so I could see the wet spot on her panties.
I didn't answer with words. I crossed the room, grabbed her by the hair, and kissed her hard. Our tongues tangled while my hand shoved inside her panties and found her slick cunt already dripping. Two fingers slid right in. She moaned into my mouth and ground against my hand.
"Fuck, your pussy is so wet for me," I growled, pumping my fingers deep. "You've been wanting your brother's cock, haven't you?"
"Yes," she panted. "I've been thinking about it for months. Give it to me."
I yanked her tank top down and sucked on her tits, biting the nipples until she whimpered. Then I stood up, dropped my shorts, and let my thick cock spring free. She dropped to her knees without being told and wrapped her lips around it, sucking like a slut who had practiced this in her head a thousand times. Her tongue licked the underside while she took me to the back of her throat, gagging but not stopping.
I fucked her face for a few minutes, holding her head and thrusting until spit ran down her chin. Then I pulled her up, bent her over the arm of the couch, and ripped her panties aside. One hard shove and I was buried balls-deep in my sister's tight cunt. She screamed in pleasure, pushing back to take every inch.
We didn't go slow. I pounded her hard from behind, slapping her ass red while her pussy clenched around me. The wet sounds of skin slapping skin filled the room. She reached down and rubbed her clit, coming hard and soaking my cock with her juices.
I flipped her onto her back on the floor, hooked her legs over my shoulders, and drove back in. Her tits bounced with every thrust. "Tell me you want your brother's cum," I ordered.
"Fill me up," she begged. "Shoot it deep in my cunt, brother. I want to feel it leaking out of me."
I slammed into her a few more times and exploded, pumping rope after rope of thick cum inside her. She came again right with me, milking every drop.
We didn't stop there. That week we fucked everywhereon the kitchen table with her riding me, in the shower with her pressed against the wall, even outside on the deck at night where anyone could have seen. She sucked me off in the car when we went for food, swallowing every drop. I ate her pussy on the living room floor until she squirted all over my face.
By the end of the week we were raw and addicted. We knew it was wrong, but that only made it hotter. We kept going long after our parents came home, sneaking quickies in the laundry room and fucking in her bedroom with our hand over each other's mouths to stay quiet.
Every time I slid into her it felt better than the last. She was mine, and I was hers, and nothing was going to stop us from chasing that forbidden high again and again.
