We had the house to ourselves on Halloween, just me and my older sister Jenna. Our parents were out at some work thing until late, and we’d both turned twenty-one that year, so the rules were already bent. Jenna came downstairs in a slutty witch costume—tiny black dress, fishnets, pointy hat, and no bra so her nipples poked through the thin fabric. I was in a basic vampire getup, but my eyes kept dropping to the way her ass filled out that skirt.
“Trick or treat, little brother?” she teased, handing me a beer. We drank fast, the alcohol loosening everything. By the second round she was sitting on my lap, grinding slow to some loud party playlist.
“You keep staring at my tits all night,” she whispered. “Want a real treat?”
I didn’t answer with words. My hands slid up her fishnets, fingers hooking the thin panties aside. She was already wet, slick and hot. I pushed two fingers inside her while she moaned against my neck. “Fuck, that’s it. Finger your sister’s cunt on Halloween.” The dirty talk hit like a drug. She reached down, freed my cock, and stroked it hard and fast, thumb smearing the precum.
We didn’t make it to the bedroom. She bent over the kitchen table, costume hiked up, and I slammed into her from behind. Her pussy gripped me tight, wet sounds filling the room with every thrust. “Harder,” she begged. “Give me that brother dick.” I grabbed her hips and pounded, the table scraping the floor. Her fishnets tore under my grip. She came first, cunt pulsing around me, screaming my name.
I pulled out and spun her around, shoving her to her knees. Jenna sucked me greedily, lipstick smearing down my shaft as she took me deep. “Swallow it all,” I growled, and she did, throat working while I flooded her mouth. Cum dripped from her chin onto her witch dress.
We weren’t done. She dragged me upstairs, stripped the rest of the way, and rode me on her bed, tits bouncing, pussy creaming all over my cock. “Tell me how wrong this is,” she demanded. “Tell me you love fucking your sister.” I flipped her onto her back and fucked her missionary, legs over my shoulders, balls slapping her ass. We came together, her nails raking my back, my load pumping deep inside her.
Afterward we lay there sweaty and panting, costumes scattered on the floor. Jenna smiled, tracing a finger through the mess between her legs. “Best Halloween ever. Next year we skip the party and just stay in.”
We fucked twice more before our parents got home—once in the shower, once against the hallway wall with her still in the torn fishnets. By morning the only evidence was the faint smell of sex and the ruined witch costume in the laundry. We never talked about it outside the house, but every Halloween since we’ve found a way to be alone.
