I slammed the front door shut and dropped my keys on the counter. The house was quiet except for the low hum of the fridge. My wife was out of town for the weekend on some work trip, and I was already hard thinking about what I was about to do.
My sister Lisa was in the kitchen, bent over the counter in a tiny tank top and shorts that barely covered her ass. She looked back at me with that same dirty grin she always gave when we were alone.
"You locked the door?" she asked.
"Yeah. No one’s coming in."
She turned around, pulled the tank top over her head, and let her tits bounce free. "Good. Because I’ve been wet all day thinking about this."
I crossed the room in three steps, grabbed her by the hips, and spun her back to the counter. My hands yanked her shorts down. No panties. Her pussy was shaved smooth and already glistening.
"Fuck, Lisa, you’re dripping," I said, sliding two fingers straight into her.
She moaned and pushed back against my hand. "Shut up and fuck me. You know I’m tighter than your wife."
I pulled my cock out, already rock hard, and rubbed the head up and down her slit. She was hot and slick. One hard thrust and I buried myself balls-deep in my own sister.
"Oh shit, yes," she hissed. "Give it to me raw."
I started pounding her right there against the kitchen counter. Skin slapping skin. Her ass rippled every time I slammed in. She reached back and spread her cheeks so I could go deeper.
"Harder," she begged. "Fuck me like you’re cheating on her with your sister."
I grabbed her hair and yanked her head back. "You like that? Being my dirty incest slut while my wife’s gone?"
"Yes," she gasped. "Tell me how much better my pussy is."
I slammed into her again and again. "Tighter. Wetter. You take it like a whore who knows she’s not supposed to fuck her brother."
She came fast, legs shaking, pussy clenching around my cock. I didn’t stop. I kept drilling her until she was whimpering.
I pulled out, spun her around, and pushed her to her knees. She opened her mouth and took me straight down her throat, tasting her own cum on my dick. Her eyes watered but she didn’t pull back.
"Swallow it all," I told her. "Every drop I give you tonight is because I’m cheating with you."
She nodded with her mouth full, sucking harder.
After a minute I hauled her up, bent her over the kitchen table, and slid back inside. This time I went slow and deep, making her feel every inch.
"You’re such a bad brother," she moaned. "Fucking your little sister while your wife thinks you’re faithful."
"Shut up and take it," I growled, reaching around to rub her clit. "You started this when you flashed me last Christmas."
She laughed breathlessly. "And you loved it. You’ve wanted to breed me ever since."
The word made me thrust harder. I pictured filling her up, knowing it was wrong, knowing it was incest, knowing it was cheating, and it only made me hotter.
We moved to the couch. She rode me, tits bouncing, while I sucked on her nipples. Then I flipped her onto her back and fucked her missionary, legs over my shoulders so I could go as deep as possible.
"Fill me up," she begged.
"Come in your sister’s pussy. Do it."
I exploded inside her, groaning as I pumped load after load into her. She came again right after, milking every drop.
We didn’t stop there. We fucked in the shower, against the bedroom wall, and once more on the living room floor before we finally collapsed.
Lying there sweaty and spent, she turned to me and smiled. "Same time next weekend when she’s gone again?"
I pulled her closer. "Yeah. And maybe we stop pretending it’s just when she’s away."
She kissed me hard. "Good. Because I’m not giving this up."
We stayed tangled together, already planning the next time I’d cheat on my wife by burying my cock deep in my sister again.
