The house was quiet except for the low hum of the fridge when I walked in from my late shift. My sister Lisa, twenty-two and fresh out of college, was sprawled on the couch in nothing but an old t-shirt that barely covered her ass. She looked up from her phone and grinned that dirty little grin she saved for when our parents were out of town.
"You finally home, big brother? I've been waiting all night for this dick."
I didn't waste time with small talk. I dropped my keys, crossed the room, and grabbed her by the hair, pulling her mouth to mine. Her tongue was hot and eager, and she moaned right into the kiss like the slut she was when nobody else was around. My free hand shoved that t-shirt up, finding her tits already hard at the nipples. I pinched one hard enough to make her yelp, then shoved two fingers straight into her wet cunt.
"Fuck, you're soaked already," I growled against her lips. "Been playing with yourself thinking about your brother's cock again?"
She nodded fast, hips rocking on my fingers. "Every damn day. Now shut up and fuck me like you mean it."
I yanked my pants down, cock springing out thick and ready. Lisa dropped to her knees on the carpet without being told, wrapping her lips around the head and sucking like she was starving. Spit ran down my shaft as she took me deeper, gagging a little when I pushed her head all the way down. Her throat squeezed tight around me, and she looked up with watery eyes, loving every second of it.
After a minute I pulled her up, bent her over the arm of the couch, and slammed into her from behind in one hard thrust. Her pussy gripped me like a fist, hot and dripping. I fucked her rough, skin slapping loud in the living room, one hand pinning her wrists behind her back while the other reached around to rub her clit fast and mean.
"Harder, fuck me harder," she begged, pushing back to meet every stroke. "Fill your sister's cunt, make me come on this big dick."
I gave it to her exactly like that, pounding deep until her legs shook and she screamed into the cushions. Her pussy spasmed around me, milking my cock as she came hard. I didn't stop. I flipped her onto her back, hooked her legs over my shoulders, and drove in again, watching her tits bounce with every thrust.
We didn't talk about the taboo shit anymore. We just fucked like animals whenever we got the chance. I came deep inside her with a grunt, pumping thick loads until it leaked out around my shaft. She reached down, scooped some up on her fingers, and licked them clean with a filthy smile.
"Round two in the shower?" she asked, already standing and pulling me by the hand.
We spent the whole weekend like that. Me eating her pussy on the kitchen table while she moaned about how wrong it felt and how good it tasted. Her riding me reverse cowgirl on Dad's recliner, ass bouncing as she begged for more cum. Quickies in the laundry room when we heard the garage door, her bent over the dryer with my hand over her mouth to keep her quiet.
By Sunday night we were sore, sticky, and grinning like idiots. Lisa kissed me slow before we cleaned up for the week.
"Same time next month when they're gone again?" she whispered.
I slapped her ass and nodded. "Count on it. Free incest sex stories don't write themselves, little sister."
We both laughed, already planning the next round.
